BERKALA SAINSTEK
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The Effect of Various Concentration BAP (6-Benzyl Amino Purine) on Orchid Growth (Macodes petola (Blume) Lindl.) In-Vitro
Get PDFMacodes petola (Blume) Lindl. has an attractive of leaves veins motif with letters pattern, so it has a high economic value. Tissue culture technique is reported as the best way of plant propagation in short time. BAP (6-Benzyl Amino Purine) has a role in stimulating shoot growth with a certain concentration. The purpose of this study was to determine the effect of Various Concentration BAP (6-Benzyl Amino Purine) on Orchid Growth (M petola (Blume) Lindl.) in vitro. This study used a completely randomized design (CRD) with 4 concentration BAP levels (0; 0.5; 1; 1.5 ppm) with 3 replication. Based on the results of the study, it showed that up to 60 DAP (Day After Planting) the composition of the media with a concentration of 0 ppm BAP had a higher average value for the increase in the stem height, number of shoots and number of roots, namely 1.77±0.798 cm, 2.4 ± 1,528 shoot and 2.4 ± 2,082 root. In contrast to the concentration of 1.5 ppm at this concentration it has a low average value the parameters of stem height, number of shoots and number of roots
Effect of Duck Egg Shell Ash with Fly Ash as Cement Substitution in Geopolymer Concrete
Get PDFThe increasing production of cement as a basic material for making concrete is due to the increasing demand for concrete throughout the world. Innovative materials are needed as a substitute for cement to reduce the greenhouse effect, fly ash is pozzolanic which in fact has the potential to replace Portland cement as the main ingredient of concrete, and duck eggshell flour has good prospects to be used as an additional precursor material for geopolymer concrete. This study aims to determine further variations of the proportion of duck egg shells, the mechanical properties of the concrete produced using duck egg shell ash with fly ash. This study used an experimental method with the percentage of duck egg shell ash at 0%, 5%, 10%, and 15% of the total use of cement. Using Na₂SiO₃ and NaOH as activator with a concentration of 14M. At the age of 7 and 28 days with room temperature treatment. This study resulted in duck egg shell ash being able to increase the compressive strength of concrete at the age of 28 days with the percentage of substitution up to 5% with a value of 59.26 MPa, in the porosity test the minimum value was at the age of 28 days at a percentage of 5% 0.403%, and the value of the modulus of elasticity. experienced an increase in value at a percentage of 5% with the result 36071.43 MPa. Duck egg shell ash with a proportion of 5% is the optimum substitution where the compressive strength, porosity and modulus of elasticity tests on geopolymer concrete have linear values
Groundwater Distribution and Potency in Faculty of Mathematics Natural Sciences, Universitas Jember based 3-Dimensional Resistivity Data Modelling
Get PDFLack of clean water when entering the dry season is a problem that often occurs in the FMIPA University of Jember. The purpose of this research is to know and estimate the potential distribution of the aquifer in the research area. 3D modeling of resistivity data was carried out using Voxler software. The input of resistivity data from the measurement results in the research area that the inversion process had carried out. The modeling results obtained an aquifer potency of 207.862,21 m3 or 21.63% of the total volume on the model image's cross-sectional map, with an irregular distribution pattern. Finally, using this method, the modeling of the aquifer potential volume and distribution can be estimated, and can be used as consideration in the use of groundwater in the Faculty of Mathematics and Natural Sciences, University of Jember
Essential Oils Activity of Legundi Leaf (Vitex trifolia L.) as A Repellent for Rice Weevil (Sitophilus oryzae)
Get PDFLegundi (Vitex trifolia L.) is a plant that contains essential oils. Legundi leaf essential oil has the potential as a more environmentally friendly rice lice repellent. The process of extracting essential oils from Legundi leaves uses the steam-water distillation method. The yield obtained from distillation is 0.10% with a bright yellow color, has a distinctive smell of Legundi oil with a specific gravity of 0.9065 gram/cm3. GC-MS search results showed that Legundi leaf essential oil contains 5 main components, namely 2-β-Pinene (16.18 %), trans-caryophyllene (13.75 %), β-Ocimene (11.16 %), Cyclohexanol (10.03%), and Eucalyptol (5.45%). Testing of repellent activity was carried out on rice lice with variations in volatile oil concentrations of 1%, 5%, 10%, and 20%. The results of the repellent test showed that the highest percentage occurred at a concentration of 20% (P4), which was 56.7%, with an application time of 120 hours (L5). Based on this, it can be said that the greater the concentration of the essential oil used, the higher the percentage of rejection of the population, this also indicates that Legundi leaf essential oil has lice repellent activity (Sitophilus oryzae)
Proximate and Essential Macrominerals Analysis of Tembakul (Mudskipper) Fish Flour as a Food Source for Stunting Prevention
Get PDFThe main cause of stunting is due to inadequate food intake according to the needs for growth and development of children, or insufficient nutrition of pregnant women. The low nutritional intake of pregnant and lactating mothers as well as children under five years old who are still growing and developing is generally caused by the wrong diet. One of the efforts to prevent stunting from an early age is to search for several sources of animal source food containing protein, fat and macro essential minerals according to nutritional standards. The purpose of this study was to determine the proximate content including protein and fat nutrition, water content and ash content, as well as mineral content including calcium, iron and phosphorus, from Tembakul (mudskipper) fish flour as the main needs in the growth of children, during pregnancy and lactation. Protein analysis was carried out using the Kjeldahl method, and fat analysis by extraction using a non-polar solvent, while the determination of essential macro minerals calcium and iron was carried out using an Atomic Absorption Spectrophotometer, and phosphorus analysis using ultraviolet spectrophotometry. The proximate content of Tembakul (mudskipper) fish flour from the Mempawah mangrove ecosystem is fat content (1.80%), protein content (50.67%), water content (24.58%), and ash content (20.20%). Mudskipper fish flour contains 3 essential minerals, namely Calcium (2.15%), Phosphorus (2.50%) and Iron (270.26 ppm)
Green Open Spaces as Butterfly Refuge Habitat: Potential, Issues, and Management Strategies for Butterfly Conservation in Urban Areas
Get PDFOne of the ecological functions of green open space (RTH) is to accommodate biodiversity in urban areas by providing a habitat for wild plants and animals. Pollution, urbanization, and various other environmental pressures make green open spaces in urban areas more susceptible to disturbances, both natural and due to human activities, which can affect the existence of biodiversity within them, including butterflies, which have specificity and sensitivity to certain environmental conditions, thus acting as bioindicators. Assessment of butterfly species, habitat conditions, and assistance with problems was carried out at four green open space locations in the East Jakarta Administrative City (DKI Jakarta Province) and four green open space locations in Pontianak City (West Borneo Province) to determine the potential and effectiveness of green open space as habitat protection for butterflies. The assessment was carried out by observing the presence of butterflies using the time search method and measuring the environmental factors that form the habitat and their correlation with the butterfly community through quantitative analysis. The results of the study showed that there were 22 species of butterflies in green open space in the East Jakarta Administrative City and 17 species of butterflies in green open space in Pontianak City. Correlation analysis at the eight green open space locations showed the same pattern, namely that the occurrence of butterfly species increased along with the number of forage plant species (as hosts or food plants) and canopy density (as shelter plants). The clustered shape of green open space is also a characteristic of green open space, which supports the function of green open space as a refuge habitat for butterflies in urban areas
Bending Strength of Apus Bamboo Fiber Reinforced Asphalt Composite Materials as Small Ship
Get PDFBamboo is generally widely used as a material or construction material in homes. However, the use of bamboo as a raw material for shipbuilding is not yet available. To make bamboo as a material in shipbuilding, the bamboo is assembled or made into a composite to meet class standards as a material for shipbuilding. In this study, the composites used were apus bamboo fiber and asphalt. The method of making the composite uses the hand lay-up method with variations of 1 layer of reinforcement, 3 layers of reinforcement, and 5 layers of reinforcement. The dimensions of the test specimen size refer to ASTM D 790-3 which is then carried out by bending tests to determine the strength of the material due to loading and the elasticity of the material. Furthermore, the results of the bending test will be analyzed using the Anova method and compared with the standard material class in ship construction. Results Asphalt composite material with apus bamboo fiber has the highest bending test value of 27,068 Mpa and the lowest bending test value of 25,998 Mpa. Based on these results, it is stated that the Bamboo reinforced asphalt (BRA) material has not been able to match and even exceed the Bamboo reinforced plastic (BRP) material in the woven, non-woven and random fiber variants. It is influenced by the diameter, and the strength of the shape between the fiber and the matrix
Extraction and Characterization of Fe2O3 from Red Mud PT. Indonesia Chemical Alumina West Kalimantan
Get PDFRed Mud is a term used for residues or waste materials from bauxite refining. One of the main compositions of red mud is Fe2O3. This study aims to obtain the optimum extraction of Fe2O3 conditions or hematite by using APDC ligands and knowing the characteristics of Fe2O3 generated. In this study, Fe2O3 extraction begins to determine the optimum pH and ligand concentration. The results of determining the optimum conditions showed pH 1 and ligand concentration of 0.5 M. Fe2O3 characteristics can be resolve through the characterization of Fourier Transformed Infra Red (FTIR), X-ray Diffraction (XRD) and X-ray Fluorescence (XRF). The results of FTIR characterization showed the stretching vibration of Fe-O Fe2O3 phase (570.50 cm-1 and 470.20 cm-1), XRD diffractogram showed the resulting crystal shape is rhombohedralsize is 27,08 nm, while the XRF characterization results showed the mass percent Fe2O3 before extraction is 42.48% and the mass percent Fe2O3 after extraction is 72.443%
Comparative Analysis of CPM, PDM and PERT Methods in Ship Repair Scheduling Planning KN. RB 309 Ternate 01
Get PDFA ship that is still carrying out sailing activities must always be in a state that is in accordance with the classification and statutory. Maintenance or repair is needed for the ship in order to stay in good condition and fit to sail. In a ship repair project, there are several important aspects that need to be considered in order to complete project activities quickly and precisely. PT. XYZ has carried out ship repair activities, but the repair activities have been delayed due to weather factors, and the late procurement of spare parts. This research was conducted by analyzing the three models of scheduling fiberglass ship repair projects using Microsoft excel and using the CPM (Critical Path Method), PDM (Precedence Diagram Method) and PERT (Project Evaluation and Review Technique) methods. Results from the CPM method on 48-day A scheduling, 33-day B scheduling, and 21-day C scheduling. Pdm method results scheduling A 48 days, scheduling B 33 days, and scheduling C 21 days. In the PERT method the project can be completed in 48 days which is 48.67%, scheduling B 34 days 5 hours 21 minutes with the possibility of a KN ship repair project. RB 309 Ternate 01 can be completed in 48 days i.e. 99.35% and scheduling C 22 days 5 hours 21 minutes with the possibility of a KN ship repair project. RB 309 Ternate 01 can be completed in 48 days which is 99.99%