Dinamika Rekayasa (E-Journal - Engineering Departement Jenderal Soedirman University UNSOED)
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Analisis Perubahan Tekanan Air Pori pada Tanah Lunak akibat Beban Trial Embankmentdengan menggunakan Plaxis Versi 7.2.
Get PDFSoft soil could be found easily in Indonesia. Constructions that built on this soil; such as embankment; face some obstructions, for instance long period consolidation, difficult soil compaction, unstable slope of embankment and high settlement value for long period. Consolidation related to particle size of soil grains, soil permeability coefficient and pore size between soil particles. This research was carried out with numerical simulation and aimed to analyze the change in pore water pressures in soft soil due to embankment load.Numerical simulation was carried out by using Plaxis version 7.2. The time periods for construction and consolidation were the same with field measurement values. Total times for both stages were 102 days. Material model used were Mohr Coulomb Model and input material model that were used were the same with filed measurement values.The results showed that at the end of construction stage there always an increasement in pore water pressure (excess pore water pressure existed) and the decreasement of pore water pressure occurred in consolidation period. Excess pore water pressures of soil below embankment were at area A, depth 0,5 was -22,8093 kPa, at area B (depth 9 m) was -21,5576 kPa and at area C (depth 13 m) was -14,159 kPa
Prediksi Data Runtun Waktu Menggunakan Jaringan Syaraf Tiruan
Get PDFThis research concerns about application of artificial neural networks (ANN) for predicting time series data. By modifying perceptron’s activation function with linear function, we got linear networks. In order to predict time series data, these linear networks combine with adaptive LMS algorithm. And then we had completed this model with time delay function to accommodate past data in time series. The data that used in the test had varied in frequency and sampling time. Results of the test had shown that the networks work properly to predict the data series
Penentuan Pembebanan Maksimum Transformator Daya Yang Menyuplai Personal Computer (PC)
Get PDFPersonal computer is electronic equiment that use solid state device, such as rectifiers, so it to be source of harmonic current. Harmonic current is sinusoidal current with multiple frequency of fundamental current which will be increase power losses because increasing effective current and frequency. In electric distribution system, transformer is component with highest power losses. They are consit of DC losses (Pdc) that influence by effective current, eddy current (PEC) and other stray losses (POSL) which influence by effective current and their frequency. This study involved increasing transformer power losses with assume that transformer supply in full load condition to personal computer. Analyzes following IEEE Std. C57.110-1998 with comparing determination maximum transformer loading use current spectrum from spectrum analyzer equipment and conversion produce Mathlab from current wave time domain to current wave frequency domain. The result are maximum transformer loading is 97,84 use spectrum analyzer and 97,84 use Mathlab sofware
Pengenalan Pola Aksara Jawa Tulisan Tangan dengan Jaringan Syaraf Tiruan Perambatan-Balik
Get PDFAutomatic reading techniques of handwriting being developed. Computerization of Java script has started to be developed. However, there is no automated reader system for documents written in handwriting Java script. This research applies backpropagation neural network for recignition of handwritten java script. Preprosesing patterns done with Java script normalize the image size to be 40x40 pixels then feature extraction. Performance network training is 99.8% and performance examination is 95.81%
Potensi Batuan Induk Batu Serpih dan Batu Lempung di Daerah Watukumpul Pemalang Jawa Tengah
Get PDFShale and claystone of Watukumpul Area have capability to become the source rock of hydrocarbon because of the ability to conserve the organic material better. Potential of the rock become source rock is depend on its maturity and total organic carbon.This research test eight example of rock to analysis their total organic carbon (TOC) and rock eval pyrolisis. Only one sample is claystone, while the seven others are shales. The analyses provide data of total organic carbon, hydrogen index, and vitrinite reflectances which was used to interpret source rock potential of research area.Through this research is known that the organic material content of shale and claystone of research area own the fair level of total organic carbon. Organic material is included Kerogen Type III with the origin of land organism or plant.These kerogens of research area prefer to produce gas or gas prone. Organic material or kerogens have reached the matured phase to generate hydrocarbon (mature level). Special follow the rock sample came from Location 8 which have over mature level. Its high maturity is suspect have relationship with the intrusion of diorite igneous rock in this research area. Further research is needed to investigate the relationship between diorite intrusion and organic material in this research area
Analisis Penyebab Tanah Longsor di Kalitlaga Banjarnegara
Get PDFIndonesia is one country that has many areas vulnerable to landslides. To the present time, there are many victims of disasters caused by landslides in Indonesia. To handle the landslide disaster, requires some knowledge about the causes, mechanisms and appropriate mitigation efforts against disasters mentioned above. Causes and mechanisms of landslides is necessary in determining the  mitigation in order to the victim can be minimized.This paper is an analytical study of the causes of landslides at Kalitlaga Village, Pagentan Sub district, Banjarnegara Regency. Causes of  landslides determined by analyzing the results of field investigation and supporting data (topographic and geological maps at the research location). The analysis results, also be used to determine the proper method of handling landslides in the area. Based on the results investigation field, it can be concluded that the main cause of landslides at Kalitlaga is topographic factors. Kalitlaga Village is located in the mountain range with a fairly steep slope ranges from 20o - 45o. The other cause of landslides is a poor drainage system in the village. Besides, based on geological maps, geological structure in the area included breksi rock in tapak formation, which has a sandstone soil type, breksi andesite composition and the organic soil. The characteristics of this soil type have a low cohesion value with a high permeability, so that condition also supports the occurrence of landslides. Kalitlaga landslide in the village can be minimized by manage the drainage system. Besides, efforts such as cutting of the slopes also need to be done at some location
Pengaruh Variasi Diameter Kolom Kapur untuk Stabilisasi Lempung Lunak pada Tinjauan Nilai Indeks Pemampatan Tanah (Cc)
Get PDFMostly soil in java, especially in northern area is included in soft clay soil classification. The behavior of this soil, have large value of coefficient compression (Cc), so consolidation settlement potentially occur in this soil. In this research, this problem will be handled by limes column.  Limes columns were expected could reduce Cc value so consolidation settlement could be reduced too. This research was conducted through experimental in laboratory, with box that have 40 cm in diameters and this heights is 40 cm. Five various of diameters  applied in this research and this affect to value of Cc would be examined. Those are 3 cm, 5 cm, 8 cm, 10 cm and 12 cm diameters.The result of this research show that limes column could reduce of Cc in significant value. The average change of Cc with limes column is 0,095 (37,63 %) if compare with Cc without limes column stabilization. The results also show that increasing of limes column diameters have no affects to the value of coefficient compression
Deformasi Vertikal Dan Horisontal Pada Tanah Lunak Di Bawah Trial Embankment Di Kendal, Kaliwungu, Semarang
Get PDFSoft soil as foundation soil always became problems related to constructions those were constructed on it. The understanding of physical and mechanical properties of soft soil were important for understanding the behaviour of this soil due to vertical loading. One of types of vertical loading was trial embankment.The analysis for vertical and horizontal deformation in soft soil carried out by comparing between the data resulted from field measurement and from numerical simulation. Numerical simulation carried out by using Plaxis version 7.0. In this simulation, soft soil and embankment soil were modelled in Mohr-Coulomb model material. The results of the analysis showed that there was an increasement in soft soil shear strength. This condition led to the decreasement in horizontal deformation. The extreme difference in horizontal deformation between field measurement and numerical simulaton caused by the difference assumption used in soil modeling. For instance modulus of elasticity assumption, soil homogeneity assumption, and fixed condition at the bottom edge of inclinometer. Maximum vertical deformation in soft soil occurred under the center of trial embankment. It happened because the highest compression occurred in this area when the maximum height of embankment reached. This condition led to highest burden supported by the soil under the center of trial embankment
Jarak Parit Irigasi Jalur Untuk Tanaman Palawija Daerah Irigasi Banjarcahyana, Banjarnegara
Get PDFAt furrow irrigation, crops plant will use the root absorption capacity to keep taking water from trench, but, depth, spreading, and the root absorption capacity of furrow irrigation is limited, and depand crops species, age of crops, and soil caracteristic. Thus, the depth and trench distance planning is very important to determine productivity of crops plant. This research aimed to know effectivity of depth and trench distance at furrow i rrigation of Banj arcahyana irrigation system using water balance model. The result of research showed that trench distance has variative and depand on water level of trench and crops species. Melon needs more short trench distance than the other crops plant, where as the maximum requirement of water will occur on August and September
Variasi Komposisi Kerapatan Partikel Dan Jumlah Perekat Terhadap Karakteristik Papan Komposit Limbah Kayu Aren – Serbuk Gergaji
Get PDFTujuan dari penelitian ini untuk memanfaatkan limbah kulit kayu pohon aren dari sisa buangan industri tepung aren sebagai finir pada lapisan papan partikel sehingga diperoleh papan komposit yang berkualitas. Panel papan komposit dibuat dari papan partikel dari serbuk gergaji kayu sengon dilapisi finir aren (tabal 5mm) melalui jalur pengempaan panas mengunakan perekat urea formaldehida (UF) jenis UA-140L. Papan komposit dibuat dengan variasi jumlah partikel 0,6 ; 0,8; dan 1,0 g/cm3 dengan variasi jumlah perekat 10%, 15%, dan 20%. Untuk pelapisan finir pada papan partikel menjadi papan komposit menggunakan jumlah perekat terlabur 50 MDGL. Parameter pengujian penelitian ini adalah sifat fÃsika (kerapatan, kadar air, penyerapan air, pengembangan tabal, dan penyusutan) dan sifat mekanika (MOR, MOE, tekan, dan tarik geser). Hasil penelitian menunjukkan bahwa faktor jumlah perekat dan jumlah serbuk menentukan dan berpengaruh terhadap sifat fÃsika dan mekanika papan komposit. Semakin banyak jumlah perekat akan menaikkan kualitas papan komposit. Diperoleh mutu papan yang paling baik dengan variasi kompoisi jumlah perekat 20% dan kerapatan partikel 1,0 gram/cm3. Upaya pemakaian limbah kulit kayu aren sebagai lapisan finir pada papan partikel disamping dapat meningkatkan kualitas papan secara mekanika juga secara fisika, yaitu tekstur permukaan yang indah. Berdasarkan standar industri, bahwa papan komposit yang dihasilkan dalam penelitian ini masih memenuhi syarat secara fisika dan mekanika