bluuebunny/crossref_metadata_2025 huggingface dataset:
Sistem Pendeteksian Kerusakan Mesin Sepeda Motor 4-Langkah Berbasis Suara Menggunakan Support Vector Machine (SVM)
Authors: Et.al Hesti Susilawati ,
Published: March 2022

Detection process early towards motorcycle engine condition will be important matter especially for common user motorcycle. This detection can be used to estimate motorcycle engine condition (normal or damage), damage kind, how big damage influence towards motorcycle continuance, motorcycle duration can survive with damage and cost estimate that taked suppose will repair damage. In this research is built 4-stroke motorcycle engine damage detection system based on voice uses Support Vector Machine (SVM) multi class. In system that proposed, motorcycle engine voice is recorded and then cultivated so that produce feature shaped coefficient Linear Predictive Coding (LPC). Coefficient LPC that extracted from this motorcycle engine voice then become an input for SVM. Furthermore SVM will determine motorcycle engine condition. Engine condition detection system based on SVM this meant to detect three engine conditions that is normal condition, damage cham chain and damage ignition system. System applications that proposed show that motorcycle engine condition detection system based on voice uses SVM has good accuracy that is 100%.
Pengaruh Perubahan Suhu pada Modulus Elastik Lapisan Beraspal Perkerasan Lentur dalam Pengujian Regangan yang Berbeda
Authors: Hardwiyono Sentot
Published: March 2022

Flexible pavement strength (Flexible Pavement) is affected by changes in the nature around the changes in temperature affect the strength asphalt layer and seasonal changes (precipitation) affect the strength of the soil layer is not particularly asphalt base. Research to determine the effect of temperature for a layer of flexible pavement in the field can be done in two ways. The first destructive test (Destructive Test, DT) such as core-drill are routed by means of a laboratory test using Universal Testing Machine (UTM). The second test is not destructive (Non Destructive Test, NDT) such as direct field test using a Falling Weight Deflectometer (FWD) and tools Spectral Analysis of Surface Wave (SASW). Testing the temperature of use as has been mentioned with a different strain performed at the Soekarno-Hatta road and highway Cikampek-Purwakarta, Bandung, West Java, Indonesia. Testing methods and testing different strain rates produce different elastic modulus values in testing asphalt flexible pavement layer. The general conclusion, the higher the temperature imposed on the asphalt pavement layer elastic modulus flexural yield whose value has declined. Conversely the lower the temperature imposed on the asphalt pavement layer elastic flexural modulus values produce increasingly rising. Different strain rate testing (FWD, UTM and SASW) on asphalt pavement layer is influenced also by changes in temperature.
Implementasi Telepon Seluler sebagai Kendali Lampu Jarak Jauh
Authors: Filiardian Setiady Iswanto , Agus Jamal ,
Published: March 2022

The bustle and activity of our daily erratic make us do not know when it comes to the house, where the lights are supposed to be lit. But it was not turned on because no one was home. This certainly makes us into a panic and anxiety, because it will not start from where we are. Another example is in the office, on the road, and anywhere at the time the house empty or unoccupied. From some of the problems mentioned above, the study sought to realize one of the benefits of the existing mobile phone. Utilization of it is to create a tool that can activate the light there at home by using a mobile phone channels. The system is able to turn on or turn off the lights even though the house empty or unoccupied by long distance. With this system we are and at anytime can menggendalikan home appliances remotely.
Perbandingan Analisis Lendutan Pelat dengan Menggunakan Metode Beam on Elastic Foundation (BoEF) dan Finite Element Method (FEM)
Authors: Diana Willis
Published: March 2022

The aim of this study was to compare deflection plates are supported by soil by using the method of Beam on Elastic Foundation (BoEF) and Finite Element Method (FEM). To validated the  methods, used data from laboratory testing of the loading plate models. For the calculation of deflection plates on elastic (soil) foundation, the accuracy of determining the modulus of subgrade reaction will greatly affect the calculation of deflection plate. Deflection calculation used Finite Element Method and BoEF method gave deflections, where close enough to those of experimental result. Both methods can be used to estimate the plate deflection.
Optimasi Kadar Aspal pada Stabilisasi Tanah Pasir Menggunakan Aspal dengan Uji CBR
Authors: Ika Ernawati Willis Diana , Afriza Marianti ,
Published: March 2022

This research aims to determine the optimum bitumen content for sandy soil stabilization (sandy soil obtained from Glagah beach, Kulon Progo). Variation in bitumen content being used was 0% to 5% by weight of dry soil. Against, a mixture of bitumen and sandy soil proctor compaction tests was performed to obtain optimum moisture content (OMC) mixture which then was tested its California Bearing Ratio (CBR). The addition of bitumen content in soil stabilization with bitumen causing a continuing lack of OMC (Optimum Moisture Content) and increased MDD (Maximum Dry Density) on the compaction process. The maximum CBR value, 20%,  was obtained at 2% bitumen content. . There was an increase of 150% CBR value when compared with the original soil without stabilization. CBR tends to decrease with further increase of the bitumen content  up to 5% which may due to the mixture being more plastic.
Evaluasi Keandalan Fisik Bangunan Gedung (Studi Kasus di Wilayah Kabupaten Sleman)
Authors: Ibnu Herlambang Sujatmiko Mandiyo Priyo ,
Published: March 2022

Since 2002 has made rules about Bangunan Gedung (UUBG) that is UU no. 28 and in 2005 also made rules of realization that is Rule of Government No. 36 where the contain is a building should managed administration and also technical. This research is to find outlevel of reliability of buildings from architect aspects there are structure, utility, and fire protection, ability of access, and also building sand  and environment in Sleman regency. Survey method (measuring, counting and filling in survey forms) was implemented to collect the primary data from the samples, and  the secondary data being used were IMBs (building construction licenses), PBB (land and building tax) slips, etc. The data were analysed using descriptive statistic and scoring depends on the book entitled Panduan Teknis Tata Cara Pemeriksaan Keandalan Bangunan Gedung, 1998, Dept. PU, and Peraturan Permen PU No.29/PRT/M/2007, Permen PU No.26/PRT/M/2008. The criteria being used to determine the building reliability were Reliable  for score of 95-100, Less Reliable for score of 75-95, Not Reliable for score of 75.The result shows that the building reliability of the Stikes being 96.51, the PMI being 94.20, the BBLK being 93.10, the RSUD being 93.36, and the Rukan being 87.68.
Comparison of Interpretation Between CPT and Res-2d Methods for Geostratigraphic Profiling Determination of Kota Depok
Authors: Et.al Putera Agung Maha Agung ,
Published: March 2022

In its simplest application, the cone penetrometer offers a quick, expedient, and economical way to profiling a subsurface soil layering at a particular site. No drilling, soil samples, or spoils are generated, therefore, cone penetration test CPT is less disruptive from an environmental standpoint. The continuous nature of CPT reading permits clear delineations of various soil strata, their depths, thicknesses, and extent, perhaps better than conventional rotary drilling operations that use a standard drive sampler at 5-ft vertical intervals. The cone penetrometer is instrumented with load cells to measure point stress and friction during a constant rate of advancement. The results can be interpreted within different theoretical frameworks or by using empirical methods, or both. RES-2D (resistivity – two dimension) completed by Geoscanner devices is applicable to interpret the soil profiling from soil exploration works. Generally, the geoscanner is used to assess the geological subsurface condition for mining works. This paper is addressed to compare the results for soil classification in Kota Depok, West Java using a cone penetration test and RES-2D. From both methods, the result of soil strata shows the soft soil in study area can be classified as clay layers from ground surface to the depth of 15.0 m. However, the CPT is less applicable to measure exactly the elevation of ground water table than RES-2D. In addition, RES-2D is also less applicable to predict the soil properties of the soil type than CPT. In general application, both devices can be applied to soil investigation for geotechnical works.
Optimalisasi Energi Terbarukan pada Pembangkit Tenaga Listrik dalam Menghadapi Desa Mandiri Energi di Margajaya
Authors: T. Haryono Arif Febriansyah Juwito , Sasongko Pramonohadi ,
Published: March 2022

The Energy Self-Sufficient Village is one of main programs from goverment about the village ability to produce energy. This program has been launched in 2007 by the President of the Republic of Indonesia, to enhance energy security in rural areas by harnessing local energy potential. The criteria of Energy Self-Sufficient Village is village capability to produce at least 60% of the total amount of required energy, using renewable energy. Geographically, Margajaya village has solar and microhydro resource which is very potential for being developed. Furthermore, Margajaya also produces agricultural commodities such as palm oil, in which it also produces waste like palm bunches which is a very potential biomass. The optimization of renewable energy for electrical power generation which has annual power peak of 65kW and daily energy consumtion of 415kWh/day in Margajaya village has been designed using HOMER. The result from simulation of Hybrid renewable system in HOMER showed that Hydro, Biomass and grid is the most economical solution over hydro-biomass-PV with battery, to design hybrid system with minimum total net present cost (NPC) and cost of electricity. The system can serve annual 100% of load in Margajaya and have surplus of electricity, and could sell to grid with amount of 124.827kWh/years. Economically, the electricity of the system costs US$ 0,013/kWh.
Perancangan Ulang Struktur Atas Jembatan Gajah Wong Yogyakarta dengan Menggunakan Box Girder
Authors: Lukmanul Hakim Sentot Hardwiyono , Bagus Soebandono ,
Published: March 2022

The Gajah Wong bridge to be studied is located in road section of Selokan Mataram, connecting Gejayan Street and Seturan area, Sleman, Daerah Istimewa Yogyakarta Province. This bridge was built in order to increase economic and to support traffic activities in this area. Gajah Wong bridge has 40 m span. The designing of this bridge used I girder, and then would be done redesigning another form of prestressed-concrete bridge which is box girder. This redesign method being used is Bridge Management System (BMS) 1992. Excel is used to analyze the structure. AutoCAD 2010 software was utilized for scetching the design. Girder designed using prestressed concrete structures with cross-sectional profile of a trapezoid -shaped box girder type . In designing the structure beam is used full - prestress post-tensioning with trapezoidal cross section box with 2.5 m high with 0,3 m floor-slab thickness. Prestressed-steel using  7 strands which is based on ASTM A-416 specification and used angkur 28 pieces of VSL type E-55.
Pemetaan Batimetri dan Analisis Pasang Surut untuk Menentukan Elevasi Lantai dan Panjang Dermaga 136 di Muara Sungai Mahakam, Sanga-Sanga, Kalimantan Timur
Authors: Purwanto Adiguna Rahmat Nugrahav, Siddhi Saputro,
Published: March 2022

Mahakam River estuary water located in East Kalimantan is territorial water that often traversed by ships transporting coal and passengers. A dock is needed in order to support such transportation activities. Sanga-Sanga Unit of Pertamina was planning to rebuild the dock that has been existed since the 1980s in the waters of the Mahakam River estuary, thus bathymetry mapping and tidal behavior analysis are needed. Bathymetry mapping and tidal behavior analysis are two important parameters in determining the elevation of the dock floor. The purpose of this study is to obtain information on the bathymetry condition and the tidal  behavior that will be used as reference of boundary conditions in determining floor elevation and dock length of the Mahakam River estuary water. Field data collection was conducted on 18 to 21 September 2012 in the water Mahakam River estuary, Sanga - Sanga, East Kalimantan. The method being used is a quantitative method, and analysis using statistical or model. Mahakam River estuary waters depth was found being between -1,3 to - 8,6 meters. It was mixed with tidal type with prominent double type, where MSL 82 cm to 260 cm interval tides, MLWL (- 28,60 cm), LLWL (- 90 cm) and HHWL (+167 cm). Dock floor elevation was obtained being +2.76 m with a value of Zo as a point of ± 0,00 m and + 2,04 with MSL as a point of ± 0,00 m, while the length of the dock is recommended to serve one boat with Loa 95,70 m is 114,84 m. With the water depth in front of the dock is needed to serve the largest ships draft is - 5 m in order to dock the ship safely.
Strategi Penawaran dalam Industri Konstruksi (Studi Kasus di Layanan Pengadaan Secara Elektronik, Kota Bandung)
Authors: Hakas Prayuda Mandiyo Priyo ,
Published: March 2022

The aims of this research are to calculate the value of mark-up using bidding strategy approach and to determine the best bidding strategy to win a tender with the optimum mark-up value and the optimum profit. The data being used in this research are auction data that have been completed in 2010-2012 at LPSE Bandung using statistical approach namely discrete multi distribution, normal multi distribution, and single normal distribution. Bidding strategy methods being used are Friedman Method, Gates Method, and Ackoff Sasieni Method. The Friedman Method can generate an optimum mark-up of 10% with expected profit of -0.0014, an optimum mark-up of -9% with expected profit of -0.0003, and an optimum mark-up of -1%  with expected profit -0.0004 for discrete multi-distribution, multi-normal distribution, and  single normal distribution, respectively. The Gates Methods can produce an optimum mark up of 6% with expected profit of 1,5000, an optimum mark up of 5% with expected profit 0.0097, and an optimum mark up of 6% with expected profit 1.2888 for discrete multi distribution, multi-normal distribution, and single normal distribution, respectively. While the Ackoff Sasieni Methods can generates an optimum mark-up of -2%  with expected profit -0.0003, an optimum mark-up of  1% with expected profit for 0,0013 for discrete multi distribution, and for both multi and single normal distributions, respectively.
Metode Ekstraksi Ciri untuk Membedakan Citra Wajah Asli dan Foto Berbasis Perceptron
Authors: Warsun Najib Afri Yudamson , Indah Soesanti,
Published: March 2022

Face is one of media for human identification. Previous studies aimed at identifying human face were for a two-dimensional images. Thus, fraud may occur when providing input in two-dimensional face images (photos). This study aims to distinguish the original three-dimensional face image with two-dimensional face image. Feature extraction based on facial geometry principles (Incomplete sentence, subject only, do not know what the authors mean). Face images (both the original and the photos) were captured at deviated angle, to the left and to the right. Each image is then sliced for each face components (eyes and nose) and sought the position of the center point of each component. Comparison between the value of the right eye-nose projection vector to the left-right eye vector and the value of the left-right eye vector become the characteristics of each image. The perceptron method was used for the classifiers. The result, the software can distinguish the original three-dimensional and two-dimensional face image with an error of 8.33% of the 24 tested images. Error occurred for some samples that show big round nose.
Pengaruh Hujan terhadap Perubahan Elevasi Muka Air Tanah pada Model Unit Resapan dengan Media Tanah Pasir
Authors: Wahyunika Sari Burhan Barid ,
Published: March 2022

This study aimed to determine changes in ground water level against time to recharge the unit models with medium sand soil in cloudburst conditions, to determine the effect of changes in humidity land in heavy rain conditions and for the efficiency of the model unit catchment .. By using the model infiltration unit made from box 170x170x200 cm3 and infiltration well with dimensions of 30x30x100 cm3 filled with 90 cm thick layer of sandy soil . The results showed that changes in ground water level is 18.8 % , 22.4 % and 24 % for the test I, II, III , respectively .. Soil moisture for the test I ran to saturation at 110 minutes , while for II and III trials in the 90th minute . Unit efficiency filtration models in improving the soil surface water is 3.6 % . This suggests that these filtration units of the model can reduce surface water runoff and increasing groundwater levels.
Analisis Sistem Penyediaan Air Bersih di PDAM Tirta Silau Piasa, Kisaran Barat, Asahan, Sumatra Utara
Authors: Ramadhan Saragih Surya Budi Lesmana ,
Published: March 2022

Water supply in Indonesia is facing some problems, such as lack of available water resources, lack of water supply services to the whole community and many water sources are polluted. In this study the water supply system in PDAM Tirta Silau Piasa was analyzed, and the results are used as input data for the evaluation of pipeline simulation using Waternet Software. Results of this study showed that the pipe for water distribution will still function properly until 2015 .
Analisis Kelayakan Aspek Ekonomi dan Kapasitas Biodigester Model Fix Dome Plant (Studi Kasus Biodigester di Botokenceng, Yogyakarta)
Authors: Monica Fanny
Published: March 2022

Beside faeces and urine from cattle’s digestion, ruminants produce highly enough methane gas (CH4). This Methane Gas is one of the gases that influence the global warming and ozone decay, with rate 1% per year and still increasing. Biogas reactor is one of the solutions to solve those problems. This research aims to find out the capacity and economic feasibility of biodigester model Fix Dome Plant located in Botokenceng, Banguntapan, Yogyakarta. Primary data which are measurements and documentation, as well as the sketch (AutoCAD) and budget plan as secondary data, were analysed in this study. The formulas to obtain the capacity of biodigester are the equation of cow’s faeces volume and faeces' solvent volume. Meanwhile, Benefit Cost Ratio (B/C) and Break Even Point (BEP) were used for economic analysis. The results of this study show that the average debit was 140.7 litres/day, with average speed for different height of flume was 4.0225 m/day. Furthermore, the operational debit was 84.4 litres/minute, with average speed for varying height of flume was 2.36 m/minute. Biodigester capacity based on digester size was 4.22 m3 which can contain faeces from 2.67 cows so that the volume needed for the biodigester was 6.33 m3 since there are four cows. According to the budget plan, the investment to build the biodigester was Rp 12,821,354.50.-. The budget earned from 4 cows was Rp 6,532,165.-/year, while the expenses were Rp 1,466,160.-/year. The result of B/C analysis was 4.45 (B/C 1), and BEP analysis occurred at the 7th year with total income was Rp 37,925,750.-.
Kajian Kadar Lumpur pada Model Infiltrasi Buatan dengan Variasi Kemiringan Tanah dan Tanaman
Authors: Supriatna Usep
Published: March 2022

From various soil conditions, there are need some efforts to restore soil functions as a water absorbent that is expected to reduce the excessive surface runoff indirectly and to increase infiltration. The purpose of this study was to calculate Total Suspended Solid (TSS) level on artificial infiltration model using the three media (grassland, krokot land, and vacant land) with the variation slope of 5°, 10°, 15° and 20°. This research also to understand the influence of soil media variety and land slope on TSS of artificial infiltration model. This research was carried out by preparing an artificial wood model with size 200 cm x 150 cm x 100 cm, which was then divided into three parts with each of them is 200 cm x 50 cm x 100 cm and used for soil media placement. The discharged water used in all three media was the same that is equal to 0.237ℓ/sec. For the results representative in each study, 100 mℓ of water samples can be taken in the runoff on the model for each soil media and then immediately examined the levels of TSS in the laboratory. According to the variation slope, the results of the research showed that the TSS on the grass soil media was 4700 mg/ℓ, 9200 mg/ℓ, 9500 mg/ℓ and 10 000 mg/ℓ. For krokot soil, the TSS was 6500 mg/ℓ, 66000 mg/ℓ, 126000 mg/ℓ and 273 900 mg/ℓ, while for vacant land was 5100 mg/ℓ, 101500 mg/ℓ, 109500 mg/ℓ and 243600 mg/ℓ. Furthermore, the steeper the lands slope, the higher TSS.
Pengaruh Campuran Abu Sekam Padi terhadap Kuat Tekan Paving Block
Authors: Waluyo Budi , Pujianto As'at , Soebandono Bagus
Published: March 2022

Rice husk is an abundant by-product of rice milling results, and so far only used as a fuel for combustion red stones, burning for cooking or thrown away. Rice husk ash (RHA) is a waste material of rice that has special properties. This material also contains chemical compounds that can be pozzolan, which contains silica (SiO2), a compound which, when mixed with cement and water can be used to enhance the compressive strength and tensile strength of concrete while silica is a chemical compound that is dominant in the rice husk ash. This study aimed to compare the results of the average compressive strength of the normal paving block with the added ingredient of rice husk ash, assess the effect of the addition of rice husk ash to the compressive strength and prices comparison between the paving block and normal paving block with the added ingredient of rice husk ash. In this study, rice husk ash serves as a replacement for cement additives with a variation of 0%, 30%, 35% and 40% by weight of cement in comparison 1pc: 10ps, 1pc: 13ps and 1pc: 15ps. The results showed that the paving blocks with a mixture of rice husk ash in comparison 1pc: 10ps produce optimum compressive strength with a mixture of rice husk ash 16.6% in the amount of 32.709 MPa. Furthermore in comparison 1pc: 13ps, paving block compressive strength values obtained with the optimal mix of rice husk ash rice 13.0% amounting to 23.709 MPa. Finally, in comparison 1pc: 15ps, paving block compressive strength values obtained with the optimal mix of rice husk ash 15.0% amounting to 17.260 MPa.
Evaluasi Beton Bertulang terhadap Perlakuan Panas (Tinjauan pada Tegangan Tarik dan Modulus Elastis Tulangan Baja Lateral)
Authors: Riswanto Riswanto , Pujianto As'at , Zulfiar Muhammad Heri
Published: March 2022

Fires phenomena have made demands to a building planner to protect, evaluate, and predict the performance of a building after a fires process. The main attention was given to the type of material, in this case, the reinforced concrete that used as a structural element, which due to heating and cooling cycles are alternating, and then the elements of reinforced concrete structures undergo a phase change both in the physical and chemical. This research related to the evaluation of reinforced concrete quality with a focus on heat treatment and reviews tensile stress and elastic modulus of the steel reinforcement. Specimens used in this study was a model of the reinforced concrete beam with a concrete cover types K250 and K300, 7.5 mm of rebar diameter and 2 cm of concrete cover thickness. Heat testing performed after 28 days of treatment with closed combustion in the furnace (heat chamber) without loading at a temperature of 1000ºC for 10 hours, holding time for 1 hour, and slows cooling for 10 hours. In normal specimens, the tensile test results show an equivalent stress value of 324.12 MPa. In specimens heat treatment with a concrete cover of K250, the tensile stress value was 259.52 MPa, while in the K300 was 263.76 MPa. Optimum tensile stress value in normal specimens was 568.62 MPa, and in specimens with heat treatment and with the K250 concrete cover was 473.74 MPa and amounted to 494.41 MPa for K300. The value of tensile fracture stress in normal specimens amounted to 552.52 MPa, and in specimens with heat treatment and with the K250 concrete cover amounted to 461.52 MPa and amounted to 465.24 MPa for K300. Elastic modulus values for normal specimen was 1,612,963.61 kg/cm2, while in specimen heat treatment with the K250 concrete cover was 1,287,888.05 kg/cm2 and was 1,311,545.42 kg/cm2 for K300.
Evaluasi Tebal Lapis Tambah Perkerasan Lentur Menggunakan Metode Bina Marga (Pd T-05-2005-B) dan Asphalt Institute (MS-17) (Studi Kasus Jalan Yogyakarta- Bantul)
Authors: Haris Ilham , Rahmawati Anita
Published: March 2022

The overlay is the addition of pavement layer thickness which is placed on the existing pavement construction to increase the strength and to serve the planned traffic during the specified period. This research is a case study conducted in Yogyakarta-Batas Kota Bantul road using Bina Marga and Asphalt Institute method. Although a new highway is upgraded, it is possible that the road construction will be damaged in a relatively short time. With this consideration, it is necessary to evaluate the thickness of pavement overlay. The length of the evaluated road segment was divided into three (3) sections, namely Segment I (Sta 4+000 - Sta 5+800), Segment II (Sta 6+000 - Sta 7+800) and Segment III (Sta 8+000 - Sta 10+320) to get the pavement thickness uniformity level. Based on the results of the analysis with the Bina Marga method (Pd T-05-2005-B), the thickness of the layers was added for segment I (6.942 cm), segment II (6.618 cm), and segment III (6.055 cm). While in the calculation using Asphalt Institute (MS-17) method, it was obtained that there was additional layer thickness 3.556 cm in segment I, 3.048 cm in segment II, and 2.790 cm segment III. The result of overlay thickness correction of Bina Marga method using AASHTO equivalent shows the number of 2.794 cm segment I, 2.470 cm in segment II, and 1.907 cm in segment III.
Pengaruh Faktor Air Semen terhadap Kuat Tekan Beton dengan Agregat Batu Apung
Authors: Pujiono Agus , Riyanto Dwi , Pujianto As'at , Soebandono Bagus
Published: March 2022

Lightweight concrete is concrete that has a unit weight less than 1800 kg/m3. Pumice can be used to make lightweight concrete as the replacement of coarse aggregate in concrete mixtures. This research aimed to discover the compressive strength of lightweight concrete with water-cement ratio and the impact of the unit weight of the concrete. This research was divided into two types of method. Firstly, the concrete was produced with the water-cement ratio of 0.30, 0.32, 0.34, and 0.36 and additional superplasticiser 2% for each variation. Secondly, the concrete was created with water-cement ratio 0.36, 0.38, 0.40 and 0.42 without admixture. Samples were tested for compressive strength after 28 days and calculated the unit weight of the concrete with pumice as the replacement of coarse aggregate. The results of this study indicated that for the first method, the maximum compressive strength value of lightweight concrete with pumice and additional superplasticiser was 11.2880 MPa with water-cement factor 0.30 and unit weight 1691.59 kg/m3. While for the second experiment, results show that the maximum compressive strength of lightweight concrete with pumice without admixture reached at 10.4620 MPa with a water-cement ratio at 0.38 and unit weight 1692.74 kg/m3.
Identifikasi Titik Api Lilin Berbasis Nilai HSV , Threshold dan Momen Citra untuk Aplikasi Robot Pemadam Api
Authors: Wiyagi Rama Okta , Soesanti Indah , Susanto Adhi
Published: March 2022

Fire fighting robot is robot that has function to find and extinguish a candle flame in the space arena. To be able carry out their duties then the robot is equipped with sensors, controllers and drivers. Phototransistor, thermopile arrays, or UVTron is sensors that usually used in fire fighting robot. These sensors have some drawbacks. Phototransistor has a relatively close distance readings. While TPA81 thermopile array has a narrow field of reading only 41 ° x 6 ° from sensor. UVtron only limited to determine whether there is any point of the fire and was unable to determine absolute position or angle of the hotspots and vulnerable to damage if the jar is touched by the hand. Additionally TPA81 sensors and sensor UVtron is relatively expensive. This research aims to build a candle light detection alternative better in terms of specification, performance, price, reliability and ease of development. As the input of the system identification using webcams camera types. The webcam running on Raspberry Pi single-board computer. Image information is converted to HSV color space (Hue, Saturation, Value) and applied threshold processing. Thresholding HSV performed on the range of values contained in the object candle flame. To get the absolute position of a candle flame using moments analysis. Identification system can identify candle flame spot with the farthest distance is 225cm. Angle readings in the horizontal plane by 60 ˚ and the vertical plane by 40 ˚. The achievement of the highest FPS obtained in image resolution size of 320 x 240 pixels which is 8.129 FPS.
Pengaruh Pemasangan Bluff Body Terhadap Karakteristik Pembakaran Biobriket
Authors: Gamayel Adhes
Published: March 2022

Biofuels are organic feedstock fuel produced by living organisms, such as solids, liquids, or gases. Biobriket combustion process is affected by the heating value biobriket constituent materials and the amount of air entering the biobriket combustion chamber. The purpose of this study isto determine the effect of variations of the bluff bodygeometry on the biobriket burning process. The independent variable used in this study, arethe fan rotation and the bluff bodygeometry. Fan rotation being used are 1000 rpm, 1200 rpm, 1400 rpm, 1600 rpm, 1800 rpm and 2000 rpm, while the bluff body geometry are round, triangle, square, hexagon and octagon. Triangular cross-section bluff body was noted to produce the highest temperature of 33.21 °C at 100 second. While the lowest temperature wasreached at 500 second with 31.18 oC. Fan rotation at 2000 rpm was found to produce the most rapid combustion,burnt out 10 grams of biobriket within 500 seconds.The conclusion to this study is the higher the fan rotation speed, the faster the combustion process of the biobriket. Triangular bluff body was found the best shape in this study.
Analisis Lendutan Model Pelat Fleksibel dengan Tiang Perbesaran Ujung dan Pelat Tidak Rapat Tanah Pada Tanah Pasir
Authors: Hartono Edi
Published: March 2022

Problems in sandy soil may occur when sand has low density, uniform gradation and thick deposit. Flexible plate foundation may used in this condition but plate deflection still high. To reduce deflection and to improve soil density, piles were used to support the plate. Installing piles made foundation system stiffer. The objectives of this study are to studies about behavior of plates and plate with pile on sandy soil. Plate deflection was observed with variation of plate thickness, bottom pile enlargement, and soil-plate-pile interaction (free standing pile and piled foundation). 1,2 x 1,2 x 1,2 m box container filled with sandy soil was used as soil media. Square and rectangular plexiglass plate were used to modelled plate. Steel pipe with 2,5 cm  in diameter were used as pile model. The behavior of the plates were observed under loading (point load). The results shows that plate deflections were affected on plate thickness, bottom pile enlargement and soil-plate-pile interaction. For a ticker plate, contact surface between plate and soil was wider. For the 40 cm x 10 cm plates with base pile enlargement, deflections were found to reduced up to 21,26%. The ‘piled foundation’ on 40 cm x 10 cm plates, (installing with 20 cm pile length, and 10 cm spacing between pile), deflections were reduced 83,63% compared with free standing foundation.
Pengaruh Pemodelan Kotak Resapan Buatan di Saluran Drainase terhadap Debit Limpasan
Authors: Adinda Sabarani , Barid Burhan , Ikhsan Jaza'ul
Published: March 2022

Drainage isasewer system in an areathat serves todrain excess rainfall. Initially, an artificial drainage channel could absorb water because the drainage channel is made from landorland with grass. Negative impacts frequently occurrence on the channel walls that are eroded by water see page. While the current drainage channel is impermeable, making direct runoff flows rapidly into water bodies. Land use is increasingly impermeable resulting bigger runoff and causing negative impacts, such as floods and decreasing groundwater savings due to rainfall directly flows into water bodies orriver nearby. In this paper, authortried tomake adrainage channel innovation by making boxes infiltration along the concrete channel. The aim of the study is to determine the effect of artificial recharge box modeling along drainage channels in reducing runoff using wastel and and grintinggrass(Cynodondactylon) media, determine the ratio of absorptionability between box wastel and media and Grinting grassmedia in reducing runoff using concrete channel/watertight as a reference. The model is made of wood with the size of 750×30×20cm and 5catchment box made every distance of 100cm along the channel, then the water flowed into the channel for an hour, and velocity data taken every five minutes before and after the flow through the box and also water level data taken every five minutes. The result shows that artificial recharge box with wasteland media can reduce runoff entering the channel, with the ability to reduce runoff at first hour about of 38.322% and it will decrease every hour, on it is smallest on the fourth hour 4 about of 28.038%. Also, a model with grintinggrass media can reduce runoff and the largestefficiency value is about 49.744% in first hour. Channel modeling with artificial recharges box using grinting grass media is better than only using wasteland for reducing.
Korelasi Empirik antara Kecepatan Gelombang Permukaan terhadap Kepadatan dan Kekakuan pada Campuran Laston – WC
Authors: Rosyidi Sri Atmaja P , Ariani Indra , Djaha Siti Isnaini K
Published: March 2022

Density and stiffness of asphaltic mixture are important parameter used for pavement design and construction. These parameter measure the required thickness of pavement.The aim of this study is to investigate the empirical relationship between pavement density and stiffness of Asphalt Concrete-Wearing Course (AC-WC) and surface wave velocity. Surface wave velocity is obtained from the seismic test set up in laboratory. A high frequency of impact source is employed in order to produce the high frequency waves propagating in mixture samples.The wave displacement is measured by accelerometer receivers connected to the computer for signal processing and spectrum analysis. In this study, AC-WC mixture is prepared with 35×,50×, 75× and 100× blows for providing sample with different density. From the results, it shows that the surface wave velocity is able to detect the various density of samples. Higher density of sample produces higher velocity and vice versa. Some empirical correlations between surface wave velocity with density and stiffness are also produced with significant statistical measures. This study shows the surface wave velocity is potential parameter employed for mixture assessment in pavement design and evaluation.
Estimasi Lokasi Gangguan Hubung Singkat pada Saluran Transmisi Tenaga Listrik
Authors: Syahputra Romadoni
Published: March 2022

In this paper, a method for short circuit fault location estimation which uses data from both ends of overhead transmission line and which does not require the data to be synchronized is described. The method fully utilizes the advantages of digital technology and numerical relaying which are available today and can easily be applied for off-line analysis. The described scheme does not require real-time communications, only off-line post-fault analysis. The method allows for accurate estimation of fault location irrespective of fault types, fault resistance, load currents, and source impedances. The simulation for single line to ground fault and symmetrical three phase fault with the variation of fault resistance of 0 ohm, 10 ohms, 30 ohms, 50 ohms, 70 ohms, and 100 ohms, respectively. The simulation has been done by using Matlab software. The simulation results of estimation error are 0.296% for single line to ground fault and 0.112% for symmetrical three phase fault, respectively. The results have shown that the method can accurately estimate the location of short circuit fault on power transmission lines.
Identifikasi Faktor Dominan Penyebab Kerentanan Bangunan Di Daerah Rawan Gempa, Provinsi Sumatera Barat
Authors: Zulfiar M Heri , Tamin Tamin , Pribadi Krishna S , Irwan Iswandi
Published: March 2022

West Sumatra is one of the province in Indonesia owning high earthquake risk. Disaster data in last one decade show the existence of occurence of earthquake generating damage of building in gross. This matter indicate that building in West Sumatra susceptance of  earthquake. One of the building susceptance is management of construction which disagree with needed conditions, law and regulation goodness which in rough, and also execution of imprecise development, imprecise build, either from planning facet and scheme, execution and observation, and also from exploiting facet and treatment. It can make infrastructure and building susceptance of disaster. When disaster happened, construction sector product becoming not function, it will generate disaster victim, or generate big loss, because destruction of other infrastructure or building. Research identify dominant factor is building susceptance represent the part of research of dissertation in the effort to less of building susceptance ( mitigation) to earthquake, by :1) sekunder data analysis of building effect of earthquake 2) perception of building characteristic and practices build 3) interview to some construction expert and earthquake. Research location in six sub-province / disaster gristle town that is; Padang city, Padang Panjang city, sub province of  South Pesisir, sub province of Tanah Datar, sub province of Pariaman and west Pasaman. Research Object at building with floor lower and confined of un-confined masonry. To know potency cause of susceptance by triangulation and sintesis among the data, fact and opinion of expert. Result of research indicate that there are 23,6 % building residing in less condition or did not maintained. To be evaluated from building form, there are 11,1% less up to standard building hold up earthquake that is having regularity of vertical form and horizontal. Pursuant to characteristic usage of brick wall with building structure there are 40,8 % having structure system susceptance of earthquake that is using inappropriate practical log and column.
Pembuatan Alat Uji untuk Mengikat Partikel Logam yang Terkandung dalam Pelumas Akibat Gesekan Mesin
Authors: Sukamta Sukamta , Sudarja Sudarja , Nurdarojat Nurdarojat , Prasetyo Agung
Published: March 2022

One of the factors that can affect to the quality of lubricantion is metal particle content due to friction of engine parts.  Metal particle in lubricanting oil could damage the engine parts, so it is neccessary to reduce the metal particle content which mingled in lubricant oil. The experiment was conducted in laboratory scale using power magnetic type ring neodymium possessing diameter of 19 mm and thickness of 2 mm. The experiment was conducted by flowing the lubricanting oil containing metal particle continually and put the magnets in engine so that the metal particle will be taken up by the magnets. The experiment used  three variations of time (5, 10 and 15 minutes) and three variations of valve to controlling the flow rate using. The highest  absortion of metal  particle was reached on opening valve 30 for 15 minutes. When volume the flow rate was 200 ml/s and the time was 15 minutes  the result of absortion was 7.48 % (magnet A), meanwhile for volume the flow rate 180 ml/s and the time was 15 minutes resulted in particle absortion of about 7.37 % (magnet B). When Magnet A and B used together and at the same flow rate and time, i.e. 180 ml/s time 15 minutes, resulted the particle absortion about 17.98 %.
Pengaruh Gaya Siklis Aksial-Torsial pada Model Simulasi Sambungan Pipa Apung Menurut Teori Gaya Dua Permukaan
Authors: Sahlan Sahlan
Published: March 2022

The two-surface theory consists of a yield surface and a loading surface, in which the surface may be defined diffrerently (axial and torsional). A Simulation experimental study on the inelastic behavior of tubular annealed alluminum alloy Alumina Duroll tubular specimens subjected to combined axial and torsional stress cycles is presented. Particular attention is paid to the question of how plastic strain is developed and how the yield surface moves along the 90o out-of-phase stress cycle for simulation model of floating hose. Experimental result agree qualitatively with the prediction of the two surface plasticity theory. This Research is based on case study research pipeline buoyancy (floating hoses)
Analisis Unjuk Kerja Boiler Feed Pump Turbine Untuk Kapasitas Ketel Uap 2000 Ton/Jam Di PLTU Cirebon Jawa Barat
Authors: Sukamta Sukamta , Sudarja Sudarja , Wathon Muhammad Mujaddid Ighna
Published: March 2022

Boiler feed pump turbine (BFPT) has an important role in the circulating of demin water from deaerator to the separator of  steam power plant operations (PLTU) in Cirebon. Flow rate, temperature and  pressure were important parameters in boiler feed pump process. Based on the BFPT function, it was necessary to do the analysis interpretation of the performance BFPT. Data needed for evaluation include pressure and temperature on the suction, pressure and temperature on the discharge, and flow capacity. In this study, the data were taken starting in January to December 2014. Data processing was performed using a centrifugal pump calculations, presented in tables and graphs using MS Excel. Analysis of data using qualitative interpretation of quantitative data. BFPT efficiency during operations in 2014 decreased in February - March amounted to 17.91% (BFPT A) and 18.04% (BFPT B). BFPT A highest efficiency obtained in January amounted to 73.76%, the lowest in March amounted to 55.45%. The highest efficiency BFPT B in February amounted to 72.94%, the lowest in March amounted to 54.9%. Change of Performance BFPT occur due to changes load generator power plant that led to the pressure change  and flow capacity. Other factors that degrade the performance because BFPT was operated continuously for 24 hours and the age of  BFPT sufficient old  cause decrease in pump performance.
Karakteristik Kecelakaan Lalu Lintas dan Pendidikan Keselamatan Berlalulintas Sejak Usia Dini: Studi Kasus di Kabupaten Purbalingga
Authors: Sugiyanto Gito , Santi Mina Yumei
Published: March 2022

Traffic accidents increased along with the increase in road traffic violations. One of the victims of traffic accidents is children. Road safety awareness and culture of children can be improved by doing the traffic safety education from an early age and promotion of the importance of road safety for children. Pedestrian is one of the vulnerable road users. The aim of this study is to investigate the characteristics of traffic accident in Purbalingga District, Central Java Province and the characteristics of the vehicle speed on arterial roads without median and introduces the principle of crossing the road by using 4-T procedure that is (Tunggu sejenak, Tengok kanan, Tengok kiri, dan Tengok kanan lagi) or waiting for a moment, look right, look left, and look right again to children from an early age. Based on the analysisof an accident data from 2010 till 2013, motorcycles are vehicles most involved accident followed by truck.Characteristics of speed in arterial roads without median with the function as a school district obtained a mean of the speed is 56.80 km/h. The probability of a pedestrian who was hit motorcycle or car passengers with this speed (56.80 km/h) will die is 90%.
Penerapan Metode K-Means Untuk Clustering Mahasiswa Berdasarkan Nilai Akademik Dengan Weka Interface Studi Kasus Pada Jurusan Teknik Informatika UMM Magelang
Authors: Asroni Asroni , Adrian Ronald
Published: March 2022

The selection process among outstanding students in a department has a big problem. This process is not fair because only involve one criteria and ignore the other criteria. We need the best student to participate in a competition held by the Indonesia Security Incident Response Team on Internet Infrastructure (ID SIRTII) of the Ministry of Communication and Information. This process uses Weka software to calculate the best student. It provides the various method to explore the data. One of them is clustering method. There are many algorithms in clustering method. In this research, we will investigate widely about one of that algorithms. Its name is K-Means. This algorithm (K-Means) will give the recommendations about the best student based on the cluster. It will represent the many clusters of a student group. The best cluster can be calculated more to get the names of the best students group. They are eligible to enter the competition.  K-means involve the GPA (Grade Point Average) and related course to support the academic skill in order to get the best student. This research helps the teacher select the best student to enter the competition. Many similar cases can use this algorithm in order to get the best student.
Tranduser Ultrasonik Sebagai Pendeteksi Gerak Pada Sistem Keamanan Rumah
Authors: Qodir Fathul , Putra Juniardi A
Published: March 2022

Ruangan yang penuh barang-barang berharga memerlukan sistem keamanan  elektronis yang bisa langsung dipantau.Transduser ultrasonik dapat menjadi alternatif solusi untuk mengamankan suatu ruangan yang butuh pengawasan secara otomatis. Transduser bisa dilengkapi buzzer atau sirane yang berbunyi sebagai alarm atau terkoneksi dengan telepon rumah, sehingga akan men-dial up telepon rumah jika ada seseorang yang tanpa ijin memasuki ruangan tersebut. Jadi, selama didalam ruangan tersebut tidak ada benda yang bergerak maka alarm tidak akan berfungsi. Hasilnya berupa jangkauan sistem yang dipengaruhi sudut antara pemancar dan penerima pada jarak pancar 1 sampai 9 meter,  relai pada rangkaian penerima akan aktif (on) mulai sudut 800 keatas, sedangkan mulai dari jarak pancar 10 sampai 15 meter, sudut pengaktifan relai berkurang 100   setiap penambahan jarak pancar 1 meter, misalnya pada jarak pancar 10 meter sudut pengaktifan relainya mulai sudut 700 keatas, sedangkan pada jarak pancar 11 meter sudut pengaktifan relainya mulai  sudut 600 keatas begitu seterusnya sampai dengan jarak pancar 15 meter