Micro-Controller V ariometer

An electronic variometer is designed and constructed to calculate glider's climb or descend rate. A PIC based micro-controller, absolute and differential pressure sensors and temperature sensor are interfaced to serve this purpose. Quantitative and qualitative outputs of the variometer are passed to the user by means of Liquid crystal display, LCD screen and a speaker respectively. A menu interface routine complete with push buttons facilitates the communication between the user and the instrument. Noise reduction starategies are implemented throughtout the design and construction phase of the instrument. The constructed variometer is able to perform NETTO compensation technique and calculating the air mass climb rate outside the glider. Based on the calculated air mass climb rate, the optimised speed of the flight is also displayed. Finally, the variometer is tested to validate the climb rate reading with the specification

Letak Bidang Longsor Lereng Candi Selogriy0- Kabupaten Magelang

ABSTRACT Selogriyo temple is one of the tourism objects in Magelang region. In 1998 the temple collapsed by land slide or slope failure. The main reason is the drainage system and slope stability disturbance. In general, the surface of sliding gives the forms of circulary cylindrical failure surface and the cross section is curve failure. The research was conducted to investigate the position of potential curves of sliding where the shear strength is minimum. The investigation carried out by field tests. One of the test was a static penetration by a static penetrometer of 25 kN capacity. The result showed that the slope failure at the Selogriyo temple area was occurred by easy stages, and the final position of sliding curve between 5,60 â 6,20 m depth from the soil surface.

Percepatan Konsolidasi Tanah Lunak Di Lahan Pergudangan Baru Pt. Pupuk Kaltim, Bontang, Kalimantan Timur

Soil consolidation process influences the settlement that occurs. Soft soil requires long period of time (decades or even centuries) in order to achieve total consolidation. It is impossible to wait for the whole process of consolidation because buildings are about to be constructed on the land. Efforts to accelerate consolidation of soft soil process have been conducted several times, for example using preloading, air compression, dewatering, and water reservoir. However, these efforts also require extensive period of time. Actually, the process of soil consolidation and the process in which water come out of soil pores (or drainage process) are quite the same. In this process, soil permeability holds an important role. Thus, the efforts to plant drain columns into the soft soil layers are required in order to accelerate water to come out of soil pores, that it will then also accelerate the consolidation process. Geosynthetic used in the acceleration process of soil consolidation is vertically planted as deep as the soft soil layer. The objective is to evacuate water inside the soft soil pores rapidly. The acceleration of soil consolidation depends highly on the drainage capacity of the geosynthetic, which works as vertical drainage. The larger the drainage capacity of the geosynthetic, the faster the soft soil consolidation process and the shorter the soil consolidation period. The optimal condition results from geosynthetic with the largest drainage capacity.

FENOMENA SAND BOILING PADA GILLIAN FONDASI PILAR BRIDGE 2104 LINTASAN KERETA API DOUBLE TRACK, GAMP/NG, YOGYAKARTA

A quick condition or boiling is a frequently occurred in sites with a high diflerence the ground water levels. This is the initial condition of the occurrence of piping phenomena, and then increases or develops in farmer internal erosion, followed by fatal collapse. Generally, these phenomena can be visually observed with occurrence of soil particles movements, brought by water flow (up and down movements). Boiling phenomena occurs in all types of soils, when the critical hydraulic gradient (i) equal to the ratio of submerged unit weight of soil and unit weight of water is reached. In sand (sandy soil) is often called sand boiling. It means the phenomena can be detected, during design calculation and choose the alternative design for foundation. The analytical result is when the excavation in range 7.50 rn 8,80 m depth without the influence submersible pump, the phenomena sand boiling occurred. In reality, the phenomena sand boiling occurred on 7,00 m depth during excavation with influence the submersible pump

Logistic: Supply Chain Management and Purchasing Strategy "Case Study of Giant Hypermarket"

This research aims to explore about supply chain management and purchasing strategies at Giant Hypermarket. It is because for more one a decade, supply chain (SCM) has received increased attention among the industries for achieving competitive advantage. Supply chain management is a fundamental concept that has evolved to enable organizations to improve their efficiency and effectives in the global and highly competitive environment of the twenty-first century. Supply chain management (SCM) is the process of planning, implementing, and controlling the operations of the supply chain with the purpose to satisfy customer requirements as efficiently as possible. For this research study, the interview session was designed in order to collect the data and information. The interviews have been done in three sessions to collect the information needed. A descriptive analysis is used in this study to explain regarding marketing policy, pricing policy, purchasing policy, quantity and delivery policy, human resource management policy and Just-in time purchasing strategies. This study also used qualitative methods, that indicates are methods that do not involve measurement or statistics. Supply Chain Management integrates supply and demand management within and across companies. Organizations increasingly find that they must rely on effective supply chains, or networks, to successfully compete in the global market and networked economy. Therefore, this study attempt to know and understand the important of supply chain management and purchasing strategies in the organization with hoping that the knowledge of this study will provide useful inputs to organization in developing impressive supply chain management and purchasing strategies to increase organization efficiency and effectiveness

Kajian Terhadap Fondasi Bendung Karet Kali Lamong I Di Kabupaten Gresik Jawa Timur

Karet Kali Lamong I weir is situated on Kedanyang Village, Cerme Sub District, Gresik District of East Java Province. This weir is utilized to supply potable water for Gresik area. The weir was constructed on soft clay layer with shallow ground water surface. The foundation uses the 15 m pile length. During the pile driving, the pile penetrates automatically into the ground because of its own weight, and it was disappeared into the ground. In an other word, it can be said that the piles were drawn into the ground. Thus, the pile driving is then stopped Considering this situation, a study towards the construction of the foundation is highly required. To conduct a study towards the weir, an observation about the condition of the soil layer under the surface is required. Based on this observation, information to determine the foundation type can be obtained. For the purpose of the field test, the 20 kN static cone penetration and hand auger apparatus are utilized to gain the soil sample. The laboratory test is needed to examine the sample and to determine the physical and mechanical characteristics of the soil samples. Based on this study, the foundation type of Karet Kali Lamong I weir is the 25 to 30 meter piles with allowable load capacity of single piles of 350 kN (compression), 35 kN (traction), and 35 kN (lateral). The 15 meter pile (such as the one that has been driven) can not be used as the foundation pile for Kare Kali Lamong I weir due to the pile length is not adequate and the load capacity of single piles can not restrain the working loa

Karakteristik Hidraulik Geokomposit Berstruktur Inti Plastik Berelief Di Bawah Pengaruh Tekanan

Geokomposit berstruktur inti plastik berelief nyak dijumpai sebagai bahan porus. Pada umumnya bahan ini menderita tekanan akibat statik maupun dinamik, sehingga hambatan aliran leprat tampang geokomposit ber-. tambah besar yang mempengaruhi karakteristik hidrauliknya. Untuk mengetahui pengaruh tekanan terhadap karakteristik hidrauliknya, perlu dilakukan penelitian di laboratorium. Usaha ani dimaksudkan mencari hubungan di antara kedua hal tersebut. Hasil penelitian menunjukkan bahwa karakteristik hidraulik geokomposit di bawah pengaruh tekanan dipengaruhi oleh bentuk struktur inti plastik, deformasi filter, dan bagian inti plastiknya

ANTIOXIDANT ACTIVITY TEST OF FRACTIONS FROM STAR FRUIT LEAVES (AVERRHOA CARAMBOLA L.) FROM THREE REGIONS IN WEST JAVA

Objectives: Previous in vitro research showed that ethyl acetate fractions of star fruit leaves exhibit strong antioxidant activities toward 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical (IC50 = 90 μg/ml). This study’s aim was to evaluate antioxidant activity of fractions from leaf extracts from star fruitsourced from three different regions in Indonesia (Depok, Sukabumi, and Subang) and, for the most active fraction (that with the highest antioxidantactivity), determine whether there was any correlation with phenolic and flavonoid content.Methods: Liquid–liquid partitioning, fractions were evaluated for in vitro antioxidant activity using DPPH radical scavenging and ferric reducingability of plasma (FRAP) assay.Results: The ethyl acetate fraction from the Subang region exhibited the strongest radical scavenging activity with both the DPPH assay (IC50 = 96 μg/ml)and the FRAP assay (FeEAC value = 1405 μmol/g).Conclusion: Ethyl acetate fractions from star fruit leaves could be used as natural antioxidants. No correlation was found between antioxidant activityand phenolic or flavonoid content

TYROSINASE INHIBITION, 2,2-DIPHENYL-1-PICRYLHYDRAZYL RADICAL SCAVENGING ACTIVITY, AND PHYTOCHEMICAL SCREENING OF FRACTIONS AND ETHANOL EXTRACT FROM LEAVES AND STEM BARK OF MATOA (POMETIA PINNATA)

Objective: This study aims to investigate the potency of matoa as a tyrosinase inhibitor and antioxidant and also to identify the chemical compounds in the most active fraction and an ethanol extract from the leaves and stem bark of matoa.Methods: The extracts were tested for their tyrosinase inhibitory activity by evaluating the formation of L-dopachrome at 490 nm. Antioxidant activity was tested using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. The most active extract from liquid-liquid partition analysis was fractionated, and then, the assays were performed.Results: The ethanol extract of leaves and stem bark of matoa showed weak anti-tyrosinase activity (percent inhibition was 24.54±0.22% and 21.93±0.57%, respectively, final concentration 200 μg/mL), but they showed strong DPPH radical scavenging activity (IC50 values were 6.11 μg/mL and 5.47 μg/mL, respectively). The ethyl acetate fraction was the most active fraction with an IC50 value of 5.38 μg/mL. Ethanol extract from the leaves and stem bark of matoa and the ethyl acetate fraction contains flavonoids, tannins, saponins, triterpenoids, and glycosides.Conclusion: Matoa does not have potency as a tyrosinase inhibitor, but it has good antioxidant activity, although still lower than that of quercetin