Journal Of Natural Sciences And Mathematics Research
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Kentong Damping Sound Intensity Level Based on Kentongan Length Variations
Get PDFThis study aims to determine the attenuation of the sound produced by a Kentongan musical instrument based on variations in the length of the Kentongan. Data were collected in a quiet room by starting to measure the noise and atmosphere of the room. This study used Sound Meter Software with version 3.4.5 with a maximum sound intensity limit of ~ 90 dB, mobile as an intermediary. This study used Kentongan with a length of 1, 29 cm and a length of 2 that was 34.1 cm. Experiments were carried out 3 times with the first experiment without Kentongan, then Kentongan 1 and then Kentongan 2. The sound intensity produced by without Kentongan is an average of 60.08 dB, then with Kentongan 1 that is, with an average of 61.86 dB, and Kentongan 2 with an average of 56.68 dB. ©2019 JNSMR UIN Walisongo. All rights reserved
Analysis of the Results of the Reduction of Cyanide Acid Content in Hevea brasiliensis Seeds
Get PDFRubber seeds (Hevea brasiliensis) are part of rubber plants that have not been utilized optimaly. The content contained in rubber seeds is sufficient, including fat content of 68.53 g/100 g, proteins 17.41 g/100 g, and carbohydratees 6.99 g/100 g. However, the obstacle faced is the presence of toxic compounds found in rubber seeds namely cyanide acid (HCN) which is very dangerous if it enters the body. The purpose of this study is to find out the right treatment to reduce the content of cyanide acid so that the rubber seeds can be utilized. The research method uses experimental comparative. The variation used in the reduction process is to soak the rubber seeds respectively for 12, 24, and 36 hours by replacing the immersion water once every 2 hours, then boil the rubber seeds into 2 liters of water for 2 hours by replacing the boiled water for 1 hour. The results showed that the greatest decrease in cyanide acid content occurred during soaking for 36 hours with boiling for 2 hours.©2019 JNSMR UIN Walisongo. All rights reserved
Utilization of Waste Combustion Heat as an Alternative Renewable Electric Energy Source Based on Thermoelectric Generator
Get PDFThermoelectric generator is one alternative energy source that is using a temperature difference system to produce electrical energy. This research study aims to utilize combustion heat waste using a thermoelectric generator as a source of renewable electricity. This research method uses the experimental method. The thermoelectric system was made using seven thermoelectric modules TEC1 - 12706 arranged in series by varying the combustion media in the form of Rice husk, Sengon sawdust (Albizia chinensis) and Teak sawdust (Tectona grandis). The test is done by measuring the output voltage, the temperature of the cold side and the hot side which are then analyzed to get the output power and generator efficiency. From the trial results it was found that the greater of the temperature difference, then the output voltage, output power and generator efficiency increase. Output voltage, output power and maximum efficiency of testing prototype thermoelectric generator that generated were 4.64 V, W 20.38 and 16.46 % with fuel Teak sawdust in the tenth minute when the temperature difference of 76.17 0C.©2019 JNSMR UIN Walisongo. All rights reserved
Study on Diversity of Dragonfly (Odonata) as A Bioindicator of Water Quality in Mount Muria Area, Central Java
No full textWater in the Mount Muria area is needed by the surrounding community to fulfill life. An indicator is needed to determine water quality. Dragonfly (Odonata) is one of the organisms as ecosystem controllers and bioindicators. This study aims to determine the diversity of dragonflies, determine water quality and describe the role of dragonflies as a bioindicator of water quality in the Mount Muria area. This type of research is descriptive quantitative research. The data collection technique used direct observation at 3 stations, namely the Colo Flower River, the Monthel Waterfall River and the River in the Rejenu Area. The results showed that there were 10 species of dragonflies consisting of 6 suborders Anisoptera and 4 suborders Zygoptera with the highest abundance value being Euphaea variegata (51.39%), Enallagma signatum (28.47%), Trithemis festiva (6.94%), Orthetrum glaucum (5.56%), Orthetrum chrysis (2.78%), Orthetrum pruinosum (2.08%), Orthetrum testaceum (0.69%), Orthetrum sabina (0.69%), Prodasineura autumnalis (0.69% ), and Drepanosticta fontinalis (0.69%). Based on water quality analysis and according to government regulation no. 82 of 2001, the water in the muria river belongs to category 2. According to the analysis of the family biotic index, it can be seen that the FBI value of the river in the Muria area is 5.60 which means the condition of the river is fair with moderate pollution levels. ©2019 JNSMR UIN Walisongo. All rights reserved
Quality of Biocompost Resulting from Biopore Holes Based on Light Intensity and Acidity Degree (pH)
Get PDFThe use of chemical fertilizers that are not balanced with the provision of organic fertilizers can damage the soil. Chemical fertilizers can also damage the balance of nutrients in the soil and lower soil pH. Therefore, organic fertilizers are needed to help restore soil fertility and LRB as a medium for composting organic fertilizers. The biopore infiltration hole (LRB) is "activated" by providing organic waste. This waste will be used as a source of energy for soil organisms to carry out their activities through the decomposition process. This decomposed waste is known as compost. Compost is a term for man-made organic fertilizer made from the decomposition process of the remains of living things (plants or animals). The investigation of this study was to determine the quality of compost based on light intensity and acidity (pH) from the results of biopore infiltration holes (LRB) as well as good physical properties of compost. This type of research is an experimental research. Good quality compost has low resistance. The pH value of the compost in samples A,B,D,E is 6.5-7.5 so it is neutral, while the pH of the compost sample C is 8.5 is alkaline. The intensity of the light is high. The results of the lowest light intensity in the compost from this study were leaf compost + sawdust + EM4 of 990 lux, fermented in LRB for 2 weeks. Meanwhile, the highest light intensity value was found in the compost of raw material leaves which were fermented for 1 month at 1017 lux. So the greater the value of light intensity in the compost, the better quality it has, because it can improve soil fertility. ©2019 JNSMR UIN Walisongo. All rights reserved
Measurement of Friction Coefficient between Glass and Rubik's Beam on the Sloping Field using Rubik Lubricant
Get PDFThis research is based on a rubik game involving the coefficient of friction. Rubik when difficult to rotate then the coefficient of friction is large. Rubik has several lubricants including Maru Lube, Ellips, and Kit Shampoo. This study aims to determine friction coefficient between the inclined plane of glass and rubik beams with lubricating. The beam is launched on an inclined plane and measured travel time. The results of the measurement of the coefficient of friction of the three lubricants namely Maru Lube lubricant has a coefficient of friction value of 0.4586, Ellips lubricant of 0.4375, and shampoo Kit lubricant of 0.4630. Based on these data it can be concluded that Ellips lubricant is the most slippery and more effective lubricant to use
Measurement of Moment of Inertia Through a Bifilar Pendulum Swing Based on a Microcontroller
Get PDFEvery object has a tendency to maintain its state of motion. The concept also applies to rotating objects called moments of inertia. This experiment aims to explain the working principle and determine the magnitude of the moment of inertia of objects using a bifilar pendulum teaching aid based on the ATMEGA-16 microcontroller. The implementation method used is the experimental method. The working principle of the ATMEGA-16 bifilar pendulum microcontroller-based teaching aids uses the bifilar pendulum principle. The moment of inertia of an object can be measured using a measuring tool that works at the moment of the inertia oscillation method. The bifilar pendulum experiment consists of an object which is tied on either side by a rope and then attached to a support. Objects are deviated horizontally with a small angle to the equilibrium position and then released, the object will experience periodic oscillations. Based on the experimental results the shorter the distance of the two bifilars, the period will be even greater, and vice versa. The magnitude of the period (T) on the bifilar pendulum is inversely proportional to the root distance between the two bifilar (d). The results of experiments carried out for variations in rope length and the distance between the ropes. The moment of inertia based on experiments for variations in length of rope at 0.35 m is (I ± ΔI) = kg/m2 ; 0.45 m is (I ± ΔI) = kg/m2 ; 0.55 m then (I ± ΔI) = kg/m2 ; 0.65 m then (I ± ΔI) = kg/m2 and 0.75 m, (I ± ΔI) = kg/m2.. Furthermore, the moment of inertia is based on experiments for variations in the distance between the ropes at 0.1 m then (I ± ∆I) = kg/m2; 0.15 m then (I ± ∆ I) = kg/m2; 0.20 m then (I ± ∆I) = kg/m2; and 0.25 m then (I ± ∆I) = kg/m2. The experimental results show that the smaller the distance between the two ropes will produce conformity to the theory of the solid cylinder using the shaft approach through the center.©2019 JNSMR UIN Walisongo. All rights reserved
Production of Brikueda (Briquettes from Teak Sawdusts and Durian Rind/Durio zibethinus) as Renewable Fuels
Get PDFJepara is a carving city. The result of carving produces sawdust waste which is usually used to be sold and burned. In addition, durian fruit is available that has a distinctive taste and made an icon of one village in Jepara. The fruit is the belle of the whole community to be eaten by meat and made food. But the skin has the traits and characters that are difficult to decompose. Then the two wastes will be combined with tapioca flour into briquettes as an alternative fuel. This research take four stage: combustion, filtering, printing, and drying. Obtained two treatment, the first treatment is using ratio wood sawdust and durian rind; 50 gr: 50 gr; 25 gr: 50 gr; 50 gr: 25 gr. The results shown it does not ignite up and very hard. The second treatment is using same ratio but added 25 gram starch, the results shown it ignite. This is due to the starch content is used, it ignite the longest with a concentration ratio of 50 gr: 50 gr because its combination increases the calories value. In durian rind there are 3786 cal/g and teak wood consists mainly of cellulose (40-50%), hemicellulose (20-30%), lignin (20-30%), and the calories value of sawdust briquettes is 4714-5519 kcal/kg.©2019 JNSMR UIN Walisongo. All rights reserved
Analysis of The Properties and Quick of Wave Creation on A Simple Ripple Tank Using Frequency Sensors
Get PDFPracticum is one of the effective methods for students in learning Natural Sciences (IPA), especially Physics subjects. The purpose of the practicum is to make it easier for students to understand concepts and help explain physics concepts that cannot be observed directly by the eye. The 2013 curriculum demands physics learning to integrate various concepts, so that students have a thorough understanding of a phenomenon. This study aims to determine the effect of spring strain and tube length on the speed of propagation and wavelength. Ripple tank experiments that currently exist, only calculate variations in fluid height, gap size, vibrator frequency, and so on. The method used in this research is experimental, for the components used consist of a set of simple ripple tank tools and frequency sensors. The analytical technique used in this research is descriptive quantitative. The highest and lowest frequencies produced from the small tube were 20 Hz (l=70 cm; = 0.04 cm) and 1 Hz (l=5 cm; = 4.30 cm). The highest and lowest frequencies obtained from the large tube were 52 Hz (l=70 cm; = 0.05 cm) and 3 Hz (l=5 cm; = 4.95 cm). The highest and lowest wave propagation velocities produced by the small tube are 4.3 cm/s (l=5 cm) and 0.89 cm/s (l=70 cm). The highest and lowest wave propagation velocities produced by the large tube are 9.87 cm/s (l=5 cm) and 2.69 (l=70 cm). Based on the results of the study, it was shown that the greater the spring strain, the higher the frequency, the wavelength and the speed of wave propagation.©2019 JNSMR UIN Walisongo. All rights reserved
Study of Zno:Ga Thin Film Structure With Variation of Plasma Power Using the DC Magnetron Sputtering Method
Get PDFZnO:Ga thin films grown on a corning glass substrate by the DC Magnetron Sputtering method have been successfully grown. The purpose of this study was to study the effect of plasma power on the resulting thin film structure. The quality and structure of the films were studied using X-ray duffraction (XRD), and scanning electron microscopy (SEM). Based on XRD characterization, it was found that the ZnO:Ga thin film has a hexagonal wurtize structure on the C-axis with orientation planes (002) and (101). The quality of the resulting thin films can also be seen from the value of full-width at half maximum (FWHM) in the orientation plane (002) which increases with increasing plasma power during the growth process from 0.13°- 0.16°. The larger the FWHM value, the smaller the crystal grain size so that the structure becomes less good. This is supported by the surface morphology of the film which is less dense when the plasma power increases. ©2018 JNSMR UIN Walisongo. All rights reserved