bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Study for the Application of Steel Frames on a Traditional Wooden Fishing Boat
Authors: Bochary L , Firmansyah M R , Sitepu G , Asri S 
Published: December 2019

Abstract
As its main material, specific timbers for supporting boat structure are required in the construction of traditional wooden fishing boat in Indonesia. The requirements for the specific timbers are vary such as it must be water resistant for ship skin planking and must be in the specific form for the boat frames in which the curvature will be different according to the specific curvature of each transversal boat section along the boat length. Currently, the required specific form of timbers for the boat frames are becoming difficult to be acquired especially in the midship area of the ship which requires extreme curvature. The difficulty to acquire the specific curvature form of frames as required have threaten the sustainability of wooden boat construction process in Indonesia. Hence, an alternative material for replacing the wooden material for boat frames is needed. The requirements for the alternative material are as follows; it must be easy to be formed according to the boat transversal section form along the boat length and must be strong enough to support the strength of the wooden boat hull. This research is conducted in order to analyse the feasibility of steel frame application for replacing wooden frame in the construction of traditional wooden fishing boat. Some alternatives of different steel frame dimensions with specific profile forms are analysed to determine the appropriate steel frame construction for certain type of wooden fishing boat. In the end, a recommendation of the steel frame dimensions for replacing wooden frame on a certain traditional wooden fishing boat is proposed.
Simulating Torque Converter on a 3 GTs Fishing Vessel using Computational Fluid Dynamics
Authors: Zulkifly  , Baharuddin  , Rivai H , Firmansyah M R , Santoso T M 
Published: December 2019

Abstract
Torque converter is needed to reduce the difference distance on an engine power curve and propeller operating load curve. Torque converter works by removing and cutting the flow of power from engine to transmission shaft automatically in order to adjust with fluctuative propeller load. Torque converter works on a fluid clutch principal hence it has ability to absorb and reduce excessive torque moments. This research aims to determine the effect of impeller distance against dynamic characteristics of torque converter on a 3 GT fishing vessel. Based on the designed torque converter dimension, a simulation using computational fluid dynamics (CFD) in an ANSYS 16.0 simulation software was conducted. The simulation was done on three distances between impellers i.e. 2.5 mm, 5 mm, and 7.5 mm and on five rotations i.e. 600 rpm, 1000 rpm, 1400 rpm, 1800 rpm, and 2200 rpm. Information obtained from the CFD simulation includes: pressure and shear stress distribution on impeller, flow velocity on the torque converter shell, torque value, as well as maximum transmission power of torque converter. The result shows that the ideal impeller gap for the 3 GTs fishing vessel from the dynamic characteristics parameter of torque converter is 7.5 mm.
Investigation on Reflected Wave by Different Geometrical Ramp Shape of Overtopping Break Water for Energy Conversions Using Experimental and Simulation
Authors: Roslan M F , Ahmad M F , Musa M A 
Published: December 2019

Abstract
Innovation trends on the development of breakwater have prolong its functionality from coastal protection to harness wave energy. One of the latest structural being study is the overtopping breakwater for the energy conversion which integrate breakwater with wave energy converter. An impact of linear ramps on reflection of the structural been studied in detail in some previous researches and create opportunity in exploring vast scope of study including the ramp shape. Therefore, intention of this study is to experimentally investigate the effectiveness of various geometrical ramp shapes of the structural toward the reflected wave. In addition, simulation was conducted and compare with the experimental result to ensure the agreement of the outcomes. This study used different wave parameters and effect of relative depth (Hm0/h) to acquire data on the behaviour of the reflected wave that describe the effectiveness of the structure. The findings of this study in the experimental work indicates that the cubic ramp shape precedes the linear ramp with 21.5% more efficient under certain wave conditions. Besides, this study additionally reveals similarities in both methods and conclude that ramp shape has significant influence on the reflection of the wave from the structure and the highest percentage of discrepancy for the CFD is 22.3%. However, the contribution of the different ramp shape is absent at the maximum depth but significantly affect as well as the depth decrease.
Performance Comparison Between Ellipse and Circular Intake Shapes of Propeller Flow Cooling System (PFCS) with Numerical and Experimental Methods
Authors: Mahmuddin F , Ramadhan S , Fitriadhy A , Klara S 
Published: December 2019

Abstract
This research carried out an analysis on the use of high pressure flow behind propeller to cool the ship main engine known as Propeller Flow Cooling System (PFCS). The system is commonly found on relatively small fishing boats at South Sulawesi area of Indonesia. Using the system, the special pump for engine cooling purpose is not needed. The present research conducted an investigation on PFCS intake shape that would be optimal for delivering water to main engine which was arisen from the propeller rotation and to find the difference of water capacity produced from different shapes of intake. The implemented research methods were numerical and experimental methods that analysed the shape of two intake shapes namely, circular and elliptical shapes. In numerical computation, ANSYS CFX software was adopted. The result from numerical computations was an initial prediction to the tendency of the results. In order to verify the results, an experiment in a tank facility known as Circulating Water Channel (CWC) tank was conducted. In the experiment, measurements were performed at 2 (two) different locations which were at the center of propeller and at 0.7R of propeller blade. The results of the research found that the performance of the elliptical intake shape is more optimal compared to the circular one.
Design of Software for Calculation and Analysis Engine Propeller Matching
Authors: Habibi  
Published: December 2019

Abstract
The criteria of a good ship are not only could floating in the sea, but it should have a very complex construction development planning. Longitudinal and transversal strengths, stability, flood, bulkhead, ship motion etc. were interrelated criteria that should be calculated for safety and comfort of the ship, passenger and cargo passenger. Matching point is an operating point of main engine same with the load character of propeller. In another word, the operating point of main engine rotation, where absorbed power by propeller is equal by produced power by main engine, and delivery equal speed with planned service speed. One step in ship design evaluating is EPM (“Engine Propeller Matching”). The lack of available software to analyze relationship between characteristics of propeller with main engine and hull, causing the calculation of EPM (Engine Propeller Matching) takes more time. Java is a very popular application, especially for enterprise application. So, that Java applications can be used to build a programming language of Engine Propeller Matching.
An Evaluation of Carrying Capacity of Jack-in Piles with Base Enlargement in Soft Clay
Authors: Aponno G , Sholeh M 
Published: December 2019

Abstract
The enhancement of the carrying capacity of the single pile can be achieved by improving the roughness of the pile shaft and/or enlarging the tip of the pile. This paper presents the results of a laboratory experiment of a modeled steel pipe pile with and without the enlargement of the pile base. The pile base was made separately from the pile shaft and was inserted using jacking pressures into an artificial and homogenous soft clay soils. The soil media used is classified as high plasticity clayey-silt is compacted in the concrete container with 600 mm in diameter and 1000 mm in depth. This study shows that the technique of pile tip enlargement works properly, and the carrying capacity of the pile is higher than a pile without base enlargement by increasing of up to ± 270%.
Optimization of Coagulation-Flocculation Process for Tello River Water Treatment Using Poly Aluminum Chloride and Aluminum Sulfate
Authors: Widiyanti S E 
Published: December 2019

Abstract
Tello River Water was utilized by PT. PLN SULSERABAR as Boiler feed water. Total Suspended Solid (TSS) in river water can be removed by the coagulation-flocculation process. Improved performance of coagulation process can be done by optimizing coagulant concentration and pH on coagulation. This research focused on optimization of pH and percent (%) removal of TSS using Poly Aluminum Chloride (PAC) and Aluminum Sulfate (Alum). The concentration of coagulant was 25% of the initial TSS of the sample for PAC and 35% of the initial TSS of the sample for Alum. The sample used in this research is Tello River Water which has initial TSS concentration of 195 mg/L with rapid mixing (350 rpm) for 1 minute, slow mixing (50 rpm) for 20 minutes and 30 minutes of sedimentation. The coagulation-flocculation process was carried out in the pH range of 4-10 and the TSS concentration was analyzed using the Gravimetric method. The optimum pH on coagulation and percent (%) TSS removal obtained from this study were 7, 99.23% for PAC and 6, 89.48% for Alum. These results indicated that PAC was the perfect coagulant for the removal of TSS because it was able to eliminate TSS nearly 100%.
Tidal Flood in Pekalongan: Utilizing and Operating Open Resources for Modelling
Authors: Pratama M B 
Published: December 2019

Abstract
The open resource materials are used in this research to construct a numerical model and study the tidal flood in Pekalongan City, including the impact of land subsidence. The area of interest is in 6 villages in the north coast of Pekalongan namely, Jeruksari, Pabean, Bandengan, Kandang Panjang, Panjang Baru, and Panjang Wetan. Delft3D, an open ware, is used for numerical modelling. While the input data are obtained from GEBCO for bathymetry, SRTM for topography, and TPXO for tidal constituent. The resulting model shows a decent agreement with field tidal elevation data from Indonesian Navy Tide Tables and GLOSS. After applying the annual land subsidence, compare to flood in May 2018, it is found that the inundation height increases for around 11, 36, and 132 cm in 2019, 2025, and 2050. In 2050, an extreme inundation over 2.5 m is found. Similar with Jakarta flood, to protect the land area, coastal dykes may be proposed. However, for long-term resilience, it is recommended to emphasize efforts in decreasing the land subsidence rate. This study indicates the threat of tidal flood in Pekalongan, thus further studies followed with field survey and more constituents in the modelling are strongly recommended.
Flexural Strength Test For Concrete Beam With Mild Steel and Reinforcing Iron
Authors: Umar M Z , Faslih A 
Published: December 2019

Abstract
Mild steel in buildings tends to only be used as a roof frame. The phenomenon in the field that lightweight steel roof truss can be combined with mortar mixture. In general this union is found on the walls of the construction of the red stone horses. This phenomenon is captured and applied dynamically, creatively, and innovatively with new idioms. Mild steel can be used as a beam reinforcement. This research is important in order to find alternative reinforcement of beams other than iron and strong beam reinforcement. This study aims to determine the ratio of flexural strength between concrete from mild steel reinforcement and concrete from steel reinforcement. This study uses a concrete flexural strength test and simple test beam method. The test beam is loaded and centered directly. Press testing machine is used as a flexural test device. The machine is equipped with two support beams and one load beam, load construction, and support blocks. Six beams are used as specimens. Test objects are made of different reinforcement. Concrete beams are made from a cross section of 600 mm x 150 mm x 150 mm, used reinforcing iron diameter of 6 mm, and amounting to three (first test object). Concrete beams are made from a cross section of 600 mm x 150 mm x 150 mm, mild steel is used with the profile shape C73.35.10 mm, and there are three pieces (second test object). This study concluded that the test beam was made from a cross section of 600 mm x 150 mm x 150 mm. and mild steel (profile C73.35.10 mm) has twice the maximum flexural strength compared to 600 mm x 150 mm x 150 mm cross section beam and reinforcing iron (6 mm diameter).
Subsurface Investigation of Freshwater-Seawater Interface on Gowa-Takalar Coastal Aquifer, Indonesia
Authors: Ramli M , Purwanto  , Anas A V 
Published: December 2019

Abstract
Gowa-Takalar Coastal Aquifer is an unconfined aquifer located in the southward of Makassar City. The Gowa-Takalar area has a heavy groundwater exploitation particularly on dry season. In this area, the groundwater is utilized to support water need for agriculture activities, marine tourism facilities, and new settlement development. The highly economic activities in this area, it causes an intensive groundwater exploitation. Since this area is located around coastal area, this area has highly susceptibility to suffer from seawater intrusion. In order to maintain the continuity of groundwater supply, a special study is needed on hydrodynamics of fresh-sea water interface as the basis for the formulation of a sustainable management model. This study as an early step of groundwater management research emphasizing on basic of aquifer and groundwater data. The research method consisting of reconnaissance study for geological & hydrogeological mapping, groundwater chemistry laboratory analysis, and geo-electrical investigation. Geological condition of this area is composed of alluvial and coastal deposits, volcanic deposits, and marine sedimentary rocks interbedded with volcanics. These materials form three hydrogeological characteristics: extensive and moderately productive aquifer, locally productive aquifers, and poorly productive aquifers of local importance. The chemical composition of groundwater from dug wells show the chloride concentration vary from 3.55 ppm to 81.65 ppm, with chloride-bicarbonate ratio is 0.008 – 0.035 indicating aquifer without sea water invasion. However, based on vertical electrical sounding, the resistivity layers vary from 0.02 to 62.50 ohm-m indicating the present of seawater intrusion into coastal aquifer.
Chemical Characteristics and Correlation of Heavy Metal Elements in Lumpue Beach, Parepare City
Authors: Sirajuddin H , Tonggiroh A 
Published: December 2019

Abstract
This study aims to analyze heavy metal elements in Lumpue Beach. Characterization of Lumpue Beach sediments in addition to the megaskopis and petrographic observation approach, determination of mineral chemical aspects using ICP-OES analysis was also done. This analysis done on 7 samples of very fine sand obtained from sieving and aimed to determine the level of heavy metal elements on the ppm scale. Based on ternary plotting diagrams, that the dominant Lumpue Beach is composed of sedimentary texture very fine sand - coarse sand. The ratio of Pb elements in the study area has an average level of 41.38 ppm and a trend line R2 = 0.25, Cd has an average level of 1.65 ppm and a trend line R2 = 0.12, Cu elements has an average level of 14.5 ppm and a trend line R2 = 0.02imes and Zn element has an average level of 62.125 ppm and a trend line R2 = 0.0022. They are indicated to exceed normal limits. Based on the use of Pearson method with two paired variables on metals Cu, Fe, Ni, Zn, Pb, Ti and Mn, it is known that Cu metal has a very weak correlation with Fe, Zn, Ni, Pb and Ti, while Fe metal has a strong correlation to Zn., Ti and Mn but have a weak correlation with Ni and Pb. Fe and Al metals are deposited with low values, this occurs in the concentrations of the two metals and follows the sediment fraction controlled by currents and tides.
Local Wisdom that forms of the Bajo Ethnic Settlements in Belopa Village
Authors: Ali M , Ramadhani A M , Ekawati A S 
Published: December 2019

Abstract
In general, the characteristics of the Bajo ethnic (Bajo) settlement are built on the waters. Likewise with the Bajo in Belopa Village, their settlements were formed starting above the waters. But along with the development and increasing population, their settlement pattern increasingly leads to land. So that, the arrangement of the settlements began to differ from its characteristics. This condition is feared to have an impact on local wisdom, which will gradually disappear. This study examines the extent of local wisdom that underlies the formation of Bajo settlements in Belopa Village. The analytical method used are descriptive analysis, comparative analysis, spatial analysis and photo pmpping analysis. The results of the study show that there are several forms of local wisdom that underlie the creation of Bajo, namely governance, value systems, procedures, and special provisions. In addition, it was also found that the condition of the settlement of the Bajo that currently exists has characteristics based on orientation patterns and material and type of building. The condition of the Bajo settlement facilities and infrastructure, some of its associations still cannot serve the needs of the community and its maintenance is still not optimal.
Effects of Work on Shock Absorber and Spiral Springs Against Vertical Loads of Vehicles Burdening the Road Structure
Authors: Ka’ka S , Himran S , Renreng I , Sutresman O 
Published: December 2019

Abstract
This research aims to examine the effect of vertical dynamic load of vehicles and changes in dimensional barriers on the road surface in its path. Experimentally this fluctuating load is replaced by a pneumatic force change based on the regulation of air pressure on the regulator. The deviations generated by the varying load work are measured by placing a proximity sensor along the spring movement. The amount of vertical load transformation reaches the road surface is measured by using Load cell. Characteristics of vertical dynamic vibration occurring due to several dimensional barriers, U (cm) obtained using mathematical modelling method with 2 DOF suspension system transfer function. The results showed a condition on the body and wheels of vehicles experienced a brief overshot for 0.14 seconds with deviation of 0.178 m. From the graph shows that the rate of deviation that occurs is large enough that Y2d = 1.03 m / s caused by a sudden shock that occurred on the wheels of the vehicle. This condition does not last long that is only duration t = 0.22 s, because the spring reaction force and shock absorber can absorb 45% vibration against the sprung and un-sprung vertical load of the vehicle.
Recent Progresses on the High Molecular Polymer of Lactobacillus Extracellular Polysaccharides
Authors: Xing Yanxia , Zhu He , Chang Guifang , Yu Kexue , Yue Fengli 
Published: December 2019

Abstract
Lactobacillus-extracellular polysaccharides (LAB-EPS) is a natural high molecular polymer with various functional properties, such as improving fermented milk texture and improving human health. Many scholars have carried out extensive and in-depth research on the structure, functional properties and structure-activity relationship of lactic acid bacteria extracellular polysaccharides, yet lacking systematic summary on the relationship among LAB-EPS types, chemical composition, structure and nutritional functions. This paper sorts out the research progress in this field and provides reference for further research and development.
Combination of LMS Algorithm in Adaptive Noise Cancellation System
Authors: Wei He , Shao Lanchun 
Published: December 2019

Abstract
In the adaptive noise cancellation system, the traditional fixed step size LMS algorithm is used to filter the noise signal, but the noise signal cannot be completely cancelled out. In order to realize the two-stage filtering, this paper proposes to combine two fixed step size LMS algorithms and to combine a fixed step size LMS algorithm with a variable step size LMS algorithm based on Bessel function. The combinations of different LMS algorithms are applied to the adaptive noise cancellation system, and the MATLAB simulation experiment is performed on the noisy signal. Theoretical analysis and simulation results show that the two-stage filtering realized by combination of different LMS algorithms is obviously better than the one-stage filtering realized by a single fixed step LMS algorithm, and the performance in terms of fast convergence speed, tracking speed and steady state error is improved.
Research and Development of Embedded Experiment Box Based on PSOC Technology
Authors: Li Ruilin , Li Honghong , Yu Jinhua , Xiong Pingping 
Published: December 2019

Abstract
With the continuous development of science and technology in recent years, chip technology is also developing rapidly. Embedded technology is a new development of computer application technology with a wide range of application fields and development prospects. With the successful development of PSOC chip technology, it can be effective. The improvement of analog-to-digital conversion, digital-to-analog conversion, display, key operation, pin input and output, etc. for overall design and hardware implementation and software implementation, so research and development of a new type of experimental box is also very helpful, the experimental box can effectively improve The function and rate of code decoding and waveform transformation have a significant effect on the teaching of universities.
Application of SPT on SA-335P91 Steel Used For High-Temperature Components of Utility Boiler
Authors: Liu Jie , Ning Bai Bai , Yu Jianming , Qian Gong , Che Chang 
Published: December 2019

Abstract
To further develop the application of SPT in the life assessment for high-temperature components of utility boiler, this paper analyses the microstructure of the common steel of SA-335P91 with the treatment of high temperature aging by OM, SEM, EDS and XRD, tests the normal tensile properties and the mechanical properties from SPT, and studies the relationship of the two kinds of mechanical properties. The results shows, after high temperature aging with 630-640°C×3000h of SA-335P91 steel, the size of precipitate in the microstructure grows from small to big, the number from many to a few, the distribution from grain inner and boundary to only boundary, and the tensile strength and yield strength of materials display the downtrend. More than ever, the experiments demonstrate the SPT is scientific, reasonable and feasible in non-destructive testing and the life assessment of SA-335P91 steel using in utility boiler, and the two fitting formulas are: σ
s=0.5398Py
/t2–49.456; σb
=0.0732P
max/t0
2 +105.59.
Method for Determining Maintenance Interval of Gear Reducer Based on Preventive Sequential Maintenance
Authors: Xiang Nan , Huo Lin , Zhang Yanqiang 
Published: December 2019

Abstract
With the continuous development of society, maintenance work has been paid more and more attention in the production field. As one of the indispensable components of many production equipment, the gear reducer can effectively guarantee the safe operation state and maximize the efficiency of the production process through preventive maintenance. This paper constructs a preventive maintenance strategy for gear reduction gearboxes through the analysis of preventive maintenance decisions. Compare the two methods of regular maintenance and sequential maintenance to determine a more practical method. Then the method is verified by an example and the conclusion is drawn.