Jurnal ILMU DASAR
Not a member yet
416 research outputs found
Sort by
Relationship between the Ecological Factors with Community Stucture of Mangrove in Pang-Pang Bay Alas Purwo National Park
Get PDFThe Mangrove ecosystem has benefits, one of them as the buffer ecosystem. This research has purpose to know the relationship between community structure of Mangrove and the ecologycal factor in Pangpang bay, Alas Purwo National Park. The result from this research are Rhizophora apiculata has highiest INP is 96,44, Sonneratia alba has lowest INP is 35,47. Dominance indeks had by Ceciops tagal is 4,70. Diversity indeks of stiks Mangroves shown low value with Shanon Weiner (H') <0,32. Result of community coefisien shown that Rhizophora apiculata is 0,315. The result is ecologycal factor community structure have relation significantly
Study of A Phenomenon STT (Spin Transfer Torque) on the Material La0.7Sr0.3MnO3 Shaped Nanowire Using Micromagnetic Simulation
Get PDFSTT (Spin Transfer Torque) can be referred to as a process of manipulation and control of spin current in the field of spintronics. When the material is ferromagnetic nanowire La0.7Sr0.3MnO3injected currents will move the domain wall with accompanying changes of spin currents. In mikromagnetik simulation shows that the application is capable of producing flow velocity or pressure of domain wall in the direction of electron flow. The domain wall pressure generating magnetization changes with increasing current density occurs. To that end, the simulation research was done in order to obtain the effect of the injection of electric current to the magnetization of the material. This phenomenon is simulated by modeling the material into the 3D geometry. The greater the current density is given the domain wall velocity or pressure on the nanowire faster so that the magnetization process is also faster. Changes in the velocity of the fastest domain wall is obtained when the material is injected with a current density as well as M-t get a graph showing oscillation pattern that is denser when the current is increased. Furthermore, the total energy analysis with variations in size diameter of 10 nm, 20 nm and 30 nm. The results show that with increasing diameter, total energy tends to increase. Keywords: spin transfer torque, La0.7Sr0.3MnO3, magnetisation, domain wall, ferromagneti
Upward Continuation of Subsurface Anomalies Utilizing Magnetic Data in The Bedadung Watershed, Jember City
Get PDFMagnetic method is a geophysics method to determine the kind of subsurface material in certain depth by identifying the magnetic characteristics of rock based on the value of magnetic suspetibility. The data analysis described the subsurface anomaly using upward continuation filter. It separated local anomaly and regional anomaly by lifting research area in certain elevation. The raw data research was the total of magnetics data around Bedadung watershed, Jember. It was proceeded to obtaine magnetic anomaly curve on 5 line in contour map. It was digitalized and use as data input of magpick and upward continuation filter program. Upward continuation program was conducted using variation of area elevation in each track from 1 m up to 30 m. magnetic anomaly from this program is compared to magpick result showed that the magnetic anomaly curve on each line have good suitability with the accuracy 0,93%. Therefore, the continuation program become the alternative in magnetic data processing
Covariance Based approach SEM with Bollen-Stine Estimation (Case Study Analysis of The Effect of Teacher and Principal Competence on Achievement of National Standards)
No full textApplications of covariance Based SEM (CB-SEM) generally use the maximum likelihood, based upon the assumption on the normal distribution of data. One alternative that could be applied if the data were not normally distributed is estimation using  Bollen-Stine bootstrap approach. In this study, the method is applied to reveal the influence of teacher competence, the principal competence, to the value of achievement of national education standards in secondary schools in Banyuwangi.The objective of this paper was to determine and analyze the relationship and to know the  the most dominant indicators of  measure latent variables between the  the principal, teachers competences on national standards of educational attainment in secondary schools in Banyuwangi. The results  indicate that all of the indicator of variables are  valid and reliable to measure corresponding latent variables. Each latent variable has the most dominan indicator. For the principal competence  latent variables the most dominant  indicator is the entrepreneurial competence, for teachers competency the most dominant is personal competence, whereas for  national education standards, the most dominant  standard of facilities. Principal competence  has indirect influence on national education standard achievement, but directly affect the competence of teachers.  Teacher competence directly influence national education standards.Keywords: Power Competence Teachers, Competence Principal, National Education Standards,  covariance Based SEM, Bollen-Stine Bootstrap Estimate
Voltammetric Synthesis of Conducting Polymer Polypyrrole and Its Response Characteristic to Alcohol
Get PDFConducting polymer is a used material for many purposes, including active compound of chemical sensor. Polypyrrole, one type of conducting polymers, is frequently used because of its advantages, namely owing high conductivity, strong mechanical properties and relatively stable compound. Â This research was aimed to develop an alcohol sensor based on polypyrrole. Electropolymerisation of the polypyrrole was carried out using cyclic voltammetric technique. This research investigated some parameters electropolymerisation, namely variation of dopant electrolyte concentration, potential scan-rate, surface morphology of the polymer resulted, characteristic of the sensor performance when exposed to some alcohol compounds. According to the result of investigation, it was found that variation of potential scan-rate and dopant concentration has significant effect to the electropolymerisation process as well as to the resulted polymer, as indicated by the voltammogram profiles, the surface morphology of the resulted polymer and the response of resistance change of the polymer when exposed to the alcohol compounds.Keywords: polypyrrole, conducting polymer, alcohol sensor, cyclic voltammetry, electropolymerisation
Simple Design Flow Analysis System for Determination of Iron by Spectrophotometric method
Get PDFThe purpose of this research is to make a series of analyzes using a flow system with a bottle Marriote as pump and spectrophotometric method for determining the content of iron in water samples. Determination of iron by this method used 1,10-fenantrolin complexing or 2,2-bipyridyl. In this method, Fe3+ is reduced to Fe2+ prior complexed with iron to form a specific color and then flowed it through a marriote bottle next to the spectrophotometer detector. The average flow rate of the liquid in the bottle Marriote amounted to 0.037 mL / sec. Limit detection obtained in the batch is 0.00017 ppm and 0.00023 ppm in simple flow systems analysis methods. Sensitivity obtained in the batch method is 0.027 and the simple flow system analysis method is 0.035. Flow rate precision values are expressed Marriote bottle with Kv values <5%. Values accuracy expreced percenting of recovery was 99% in the batch method, whereas the simple flow system analysis method was 98.5%. Results of t-test analysts suggest that iron determination using flow systems analysis (FIA) with the replacement pump bottle Marriote not differ significantly from the results obtained with the batch system. Â Keywords: batch method, bottle Marriote, Flow Injection Analysis, spectrofotometr
Identification of Ibuprofen, Ketoprofen and Diclofenac by Using Test Strip Based on Imobilized Spesific Reagent on Nata De Coco Membrane
Get PDFIdentification of ibuprofen, ketoprofen and diclofenac can be done by using simple method, it is called test strips. Test strip is made by immobilized specific reagents with entrapment technical on membrane matrix, which the used membrane nata de coco. Immobilization reagents with entrapment techniques aimed to trap reagent molecules in the space between the supporting material.The success of this imobilization can be seen from membran changing color after additional reagent and there is no leeching after additional sample on membrane. The used reagent for this identification is methyl red for ibuprofen and ketorpofen, copper acetate for ibuprofen, potassium iodide for ketorofen and mandelin for diclofenac. From the testing result can be seen that potassium iodide is the most specific reagent compare with the other threee other reagents. By using tes strip arranged with the strip made by this imobilization, test srtrip can be used to differentiate the tree other standard samples. Â Keywords: entrapment, nata de coco membrane, reagent spesific, test strip
Isolation of Genes Encoding Arthropod Odorant Binding Proteins (OBP), D7 from Salivary Gland Vectors of Malaria: Anopheles sundaicus
Get PDFThe isolation of Arthropod Odorant Binding, D7 protein, encoding genes from Anopheles sundaicus and An. maculatus mosquitos as the malaria vectors in Indonesia is necessary to recognize their characteristic. The isolated genes can be used to develop the Transmission Blocking Vaccine (TBV). This research aims to characterize the D7 protein encoding genes from An. sundaicus and An. maculatus through the synthesis of complementary DNA (cDNA) of D7 protein by using D7 protein primer that has been used for the other species of Anopheles. The mosquitos were taken from Dusun Parasputih, Bangsring, Wongsorejo, Banyuwangi, Jawa Timur. Isolation of the salivary gland was done by performing microdisection method and the isolation of the total RNA was done by performing High Pure RNA Isolation Kit (Roche-Germany). Synthesis of cDNA D7 encoding gene and its amplification were performed by using Maxime RT-PCR Premix Kit (iNtRon Biotechnology). The result of the total RNA and RT-PCR were run  in agarose gel and visualized under the UV transiluminator. Based on the visualization, we found that the salivary gland total RNA of female An. sundaicus was 500-750 base pair (bp). The RT-PCR visualization showed a band sized below 100 bp and it was concluded not to be the size of the D7 protein encoding gene. An incompatibility of D7 primer from An. gambiae with cDNA template from An. sundaicus was suspected to be the reason of the gene isolation failure.Keywords: gene isolation, D7 protein, salivary gland, Anopheles sundaicu
The Aplications Biological Control of the Pest Population ( Plutella xylostella Linn. And C. pavonana Zell.) and Their Natural Enemies in Cabbage Plants in the Village Kalibaru Kulon, District Banyuwangi
Get PDFThe aim of the research was to determine the effectiveness of biological control agens to the population of pests and their natural enemies in cabbage crops in agricultural land Kalibaru kulon Kab. Banyuwangi. The research was conducted by Randomized Complete Block Design with with five replications. The treatments were Control as P0, Heterorhabditis sp. as P1, Bacillus thuringiensis as P2, Profenofos as P3, Beauveria bassiana as P4, Red bacteria as P5. Data were obtained from observations of pest population and their natural enemies, as well as the percentage decrease in the population of pests and their natural enemies. Data were analyzed using ANOVA and LSD were tested further by 5%. The results showed that Heterorhabditis sp. was the most effective agents to control populations of Plutella xylostela Linn. and Crocidolomia pavonana Zell., this is also indicated by a decrease in pest population of Plutella xylostela by 54.66% and amounted to 47.9% Crocidolomia  pavonana. Aplication biological agens  was not affect the population of natural enemies Coccinela repanda, and Verania sp. Keywords : Cabbage, Biological Control, Pests, Natural enemie
Production of Cellulase Enzyme from Aspergilus niger using Rice Husk and Bagasse as Inducer
Get PDFAspergillus niger is fungi can produce cellulase enzyme with agriculture waste as natural inducers. The purpose of this study was to compare the natural inducers potential between rice husk and bagasse to produce cellulase enzyme from Aspergillus niger. Production of cellulase enzyme was done with variety of inducers such as CMC, rice husk, and bagasse. The optimization of enzyme production includes optimum production time, inducer type, and optimum concentration of inducer. Furthermore, the enzyme also was characterized in pH and temperature. Enzyme activity test using the DNS method with CMC as substrate. According of this test result show that highest cellulase enzyme activity has production time for 108 hours with rice husk as inducer. The optimum rice husk concentration was needed of 2.5%. The cellulase enzyme was induced by rice husk has optimum activity at pH 4 and 50°C of 0.709 IU/mL.  Keywords : cellulase enzymes, Aspergillus niger, inducers, rice husk, bagasse