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Jurnal ILMU DASAR
Published by Universitas Jember
ISSN : 14115735     EISSN : 24425613     DOI : -
Core Subject : Science, Education,
Jurnal ILMU DASAR (JID) adalah jurnal ilmiah yang melingkupi bidang matematika, fisika, kimia dan biologi. Naskah yang diusulkan untuk diterbitkan Jurnal Ilmu Dasar adalah naskah yang belum pernah diterbitkan dan atau tidak sedang dipertimbangkan penerbitannya di majalah lain. Jurnal Ilmu Dasar menerima tulisan hasil penelitian dasar (bukan aplikasi) untuk bidang matematika, kimia, fisika, dan biologi. Naskah ilmiah ditulis dalam bahasa Indonesia atau dalam bahasa Inggris yang baik. Secara lebih detail dapat dilihat dari pedoman penulisan.
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Articles 10 Documents
Search results for , issue "Vol 19 No 1 (2018)" : 10 Documents clear
Study of Insect Diversity in Rice Agroecosystem in Karawang West Java Siriyah, Siti Latifatus; Khamid, Miftakhul B.R.; Bayfurqon, Fawzy M
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3222.364 KB) | DOI: 10.19184/jid.v19i1.5619

Abstract

Insects were collected from rice fields in Karawang West Java. Since insects are dominant in Rice field, their role in the ecosystem are important regarding the rice production. Therefore, the occurance of insect species and their role in ecosystem are important to understand. The aim of this reasearch was to study the insect occurance in rice field in Karawang to obtain the potential candidate for biological control agent. The insects were collected using sweep net, pit fall trap and light trap. Nine insect orders were collected and 49 morphospecies were identified including insect pest, parasitoids, predator, tourist and detritivore. Paederus sp., Cyrtohinus and Micraspis sp., were the most abundant entomophagous insect that is potential candidate for biological control agent in Karawang. Keywords: insect, insect diversity, rice fields, karawang
Effectiveness of Beauveria bassiana Powder as Larvacide to Aedes aegypti Linnaeus, 1762 Larvae Hariani, Nova; Wulandari, Eka; Dharma, Bodhi
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (164.878 KB) | DOI: 10.19184/jid.v19i1.5383

Abstract

Study of effectiveness of Beauveria bassiana Powder as Larvacide to Aedes aegypti larvae was conducted on September 2016 to May 2017 in Ecologi and Systematics Animal Laboratory, Faculty of Mathematics and Natural Sciences, University of Mulawarman. This study aimed to determine the effect of Beauveria bassiana powder with use flour rice media on differents concentration as larvacide to mortality of larvae Aedes aegypti. Stages of study include arranged experimental design (Completely Randomized Design) with concentration of 0%, 0.125%, 0.25%. 0.5% and 0.75%, taking sample, rearing third instar larvae of Aedes aegypti and application Beauveria bassiana powder in 48 hours observation. The mortality value of larvae willbe presented on percentage tabel and graph. The result showed, this product is capable of killing larvae for 48 hours with the percentage mortality 0%, 10%, 28%, 70% and 80% in each concentration. Mortality of larvae is influenced by concentration and period of exposure. Increased of product concentration that given and period of exposure can effected increased of mortality percentage. Keywords: mortality, Beauveria bassiana powder, Aedes aegypti larvae
FeCrMnNiCSi Coating on Grey Cast Iron FC 25 Variable Gas Pressure on Thermal Arc Spray Method Purwaningsih, Hariyati; Putra, Rifqi Tantyo; Raharjo, Slamet; Rochiem, Rochman; Purniawan, Agung
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2693.648 KB) | DOI: 10.19184/jid.v19i1.6339

Abstract

One of the important components of motor fuel engine is cylinder liner. There is a compression and friction combustion process with a piston that produces mechanical energy in cylinder liner. This process introduced several problems that often arise, such as wear reducing because the piston is moving back and forth continuously causing gas leakage so that compression pressure is reduced. To prevent such damage it is necessary to coat the metal with other material that has better wear resistance. This study used FeCrMnNiCSi coating material deposited on Gray cast iron FC 25 by thermal arc spray method to analyze the influence of pressure air variation on morphology and mechanical properties. SEM analysis showed that the higher pressure on the coating process results smaller particles thereby decreasing the porosity. Roughness testing also showed a decrease in the higher pressure, at a pressure of 6 bar of 127.333 μm. Microhardness showed that the 6 bar pressure indicating hardness was 639.8 HV. At 6 bar pressure also obtained the highest abrasion resistance value is 29.66 rotation / mg. The value of adhesion strength in the 4 bar pressure variables shows the optimum value compared with other pressure variations of 15.02 MPa. Keywords: cylinder liner, thermal arc-spray, pressure ambient
Comparation of Magnetic Flux Cases Solution in Around Electrified Wire between Analytical and Computational Methods Haning, Ady E.P; Warsito, Ali
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5333.09 KB) | DOI: 10.19184/jid.v19i1.6338

Abstract

Have analyzed comparative analytical and numerical computation solutions in the case of magnetic flux to the circular loop of radius R as far apart as H around the current I in the wire. The aim is to know how the methods used have an accurate solutions calculated based on relative error value. The analytical method use taking concept of polar coordinates and the computational method using the function of analytic equations modified based on Simpson and Monte Carlo method. Both methods are aprroaches in numerical integration.After test with variation of combination of R=0.1 and 0.2 and H=0.1 and 0.2, the Simpson and Monte Carlo indicate the integration value corresponding to the exact or analytical solution value, the relative error value of the Simpson method range from 0,004% - 0,017% and the relatif error value for Monte Carlo method range from 0.056% - 3.4296%. Keywords: magnetic flux, analytical, simpson, monte carlo, relative error
Growth of Spinach Plant (Amaranthus tricolor L.) by Application of Kascing Organic Fertilizer and Bamboo Leaf Litter Mulch Setiawati, Tia; Rahmawati, Fitryasari; Supriatun, Titin
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (187.299 KB) | DOI: 10.19184/jid.v19i1.5305

Abstract

Spinach (Amaranthus tricolor L.). is one of the vegetables that are economically valuable with high nutrient content to support public health so that its production needs to be improved. The purpose of study was to obtained the optimal dosage of kascing organic fertilizer and the thickness of the bamboo leaf litter mulch on increase growth of spinach. The research used experimental method with randomize block design (RBD), two factors and three replications. The first factor was the adding of kascing organic fertilizer (K), consist of five levels doses, i.e: without adding kascing fertilizer (k0); 2.5 g/kg of soil (k1); 5 g/kg of soil (k2); 7.5 g/kg of soil (k3) and 10 g/kg of soil (k4). The second factor was bamboo leaf litter mulch (M), consist of three levels, i.e: without mulch (m0); mulch with thickness of 2.5 cm (m1); mulch with thickness of 5 cm (m2). Parameter observed were the plant height, the number of leaves, the leaf area, the shoot dry weight and the root dry weight. The data obtained was analyze using Anova and Duncan’s Multiple Range Test (α=5%). The results showed that interaction between dosage of kascing fertilizer with bamboos leaves litter mulch could increase the average of plant height (50.17 cm), number of leaves (40.33 leaves), shoot dry weight (5.77 g) and root dry weight (1.78 g) of spinach. Commonly, kascing organic fertilizer dose of 5 g/kg of soil (k2) and bamboos leaves litter mulch on the tickness of 5 cm (m2) combination was the best treatment for growth of spinach. Keywords: bamboo leaf litter, mulch, organic fertilizer of kascing, spinach
Synthesis Analgetic-Antiiflammation N-(4t-Buthylbenzoil)-p-Aminophenol by Using MgF2 Catalist Siddiq, Hadi Barru Hakam Fajar; Eryani, Mikhania Christiningtyas; Suryaningsih, Farida
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1208.502 KB) | DOI: 10.19184/jid.v19i1.5380

Abstract

Synthesis of N-(4t-buthylbenzoyl)-p-aminophenol has been done by reacting p-aminophenol and 4-tert- buthylbenzoyl chloride compounds with 1% MgF2 catalyst. N-(4t-buthylbenzoyl)-p- aminophenol as an antiinflamatory analgesic. Products were characterized by organoleptic test, melting point determination, TLC, UV/Vis Spectrophotometry, and infrared spectrophotometry. The results of the organoleptic test showed that N- (4t-butylbenzoyl) -p- aminophenol is powdered, gray and tasteless. Melting point of N-(4t- buthylbenzoyl)-p- aminophenol was 193 – 194 °C. TLC results showed that N-(4t-buthylbenzoyl)-p- aminophenol had two Rf values of 0.73 – 0.76 and 0.89 – 0.91. The results of UV wavelength scanning showed that N- (4t-butylbenzoyl) -p-aminophenol had two peaks at 290 and 294 wavelengths. Yield of N-4t- butylbenzoyl-p-aminophenol was 24.35%. Keywords: N-(4t-buthylbenzoyl)-p-aminophenol, MgF2, catalyst, an antiinflamatory analgesic
Effect of Silica Composition from Rice Husk Ash on The Performace of Absorbing Electromagnetic Wave on Composite of Unsaturated Polyester Resins/Silica Fauzy, Rizky; Adi, Wisnu Ari; Taryana, Yana; Yusmaniar, Y.
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2353.719 KB) | DOI: 10.19184/jid.v19i1.6336

Abstract

This study aim is to know the effect of silica composition on the absorption of electromagnetic waves in the composite of unsaturated polyester resins (UPR)/silica. Silica raw materials have been synthesized from the results of rice husk ash extraction. The results of the analysis phase and elementary respective using X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) show that the extraction of silica has an amorphous phase with a high purity. This silica powders are filler material acts as an electromagnetic waves absorber material and combined with the UPR as a matrix to form a composite. Silica powder varied with several compositions in this composite. The observation of scanning electron microscope (SEM) shows that the silica particles have been distributed evenly in the UPR matrix. Meanwhile the results of testing the absorption of electromagnetic waves at frequency range of 8 GHz - 12 GHz using a vector network analyzer (VNA) show that the addition of silica composition have significant effect on the absorption of electromagnetic waves. The more the silica content in the UPR matrix causes the absorption of electromagnetic waves more increasing. It was concluded that the presence of silica can improve the absorption performance of electromagnetic waves in composite UPR/silica. Keywords: rice husk ash, silica, UPR, composites, electromagnetic wave absorber
The Development of Web-based Graphical User Interface for Learning and Fitting Generalized Estimating Equation with Spline Smoothers Tirta, Made; Anggraeni, Dian
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (926.554 KB) | DOI: 10.19184/jid.v19i1.6997

Abstract

Statistical modeling (regression analyses) have been growing rapidly into various directions to accommodate various data conditions. For longitudinal or repeated measures data, one of the suitable models is GEE (Generalized Estimating Equation). In practice, to do complex modeling such as GEE, the use of statistical software is necessary and it is available on free open source software R. However, GEE modeling on R can only be access through command line interface (CLI), and most practical researchers very much rely on Graphical User Interface (GUI) based statistics software. To make access to GEE (both order 1 and 2) much easier, we developed, using Shiny toolkit, two types of web-based GUI, standard pull down menu type and e-module type (with narrative theories) that can be utilized for learning and fitting GEE. This paper discusses the features of the interfaces and illustrates the use of them. Keywords: longitudinal data, Generalized Estimating Equation (GEE), exponential families, statistical modeling, correlated response, nonparametric, natural splines, shiny toolkit
Magnetic and Microwave Absorbing of Mn(1-x)NdxFe2O4 Synthesized with Co-Precipitation Method Adha, Mia; Yunasfi, Y.; Nurhasni, N.
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (805.048 KB) | DOI: 10.19184/jid.v19i1.6337

Abstract

Characterization of magnetic and microwave absorbing properties of Mn(1-x)NdxFe2O4 synthesized with co-precipitation method have been carried out. Mn(1-x)NdxFe2O4 (with x = 0.0; 0.4; and 0.8) powders was synthesized from mixture of NiCl2, NdCl3 and FeCl3 in mole ratio. Mixing of this powders were soluted with NH4OH 4M up to pH = 9.0. The formed precipitate were washed with demineralized water up to pH = 7.0 and then dryed at 120 oC for 5 h, sintered at 1200 for 3 h. Phase identification with X-ray diffractometer (XRD) have formed composite multiphases, which indicated by the appearance of MnFe2O4, NdFeO3 and Fe2O3 phase. The magnetic measurement using VSM (vibrating sample magnetometer) showed that the sample exhibited a ferromagnetic behavior, the Ms value is lower (in the range of 30 – 11 emu/g) while the Hc value is greater (in the range of 111 – 132 Oe) with increased concentration of Nd3+ ion (x values). Measurement by VNA (Vector Network Analyzer) showed the ability of absorption of microwaves increased with increasing content of Nd3+ ion, the composition of x = 0.0 at about 70% and addition of Nd3+ ion up to composition x = 0.8 at about 91%. Keywords: MnNd ferrite, co-precipitation methode, magnetic properties, microwave absorption
Simultaneous Determination of Magnesium (Mg2+) and Ammonium (NH4+) by Flow Injection Analysis Kholifa, Mulik; Mulyono, Tri; Muflihah, Yeni Maulidah
Jurnal ILMU DASAR Vol 19 No 1 (2018)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (623.294 KB) | DOI: 10.19184/jid.v19i1.5483

Abstract

An automatic method for the simultaneous determination of magnesium and ammoniun by flow injection analysis is described. This analysis used two detectors, potentiometry and spectrophotometry, for the determination of magnesium and ammonium simultaneously. Potentiometric detectors are used to detect ammonium ions, whereas spectrophotometer detectors are used to detect the presence of magnesium ions. The performance of the FIA system includes linear range linearity, limit of detection, sensitivity, reproducibility and recovery test. Spectrophotometry FIA showed good performance with several criteria of linearity with regression value of 0.9918, the detection limit of 0.06 ppm, a sensitivity of 0.0115, repeatability of less than 2% and the percent recovery of 91,6%. While potentiometric FIA showed th performance with several criteria of linearity with regression value of 0.9896, the detection limit of 0.17 ppm, a sensitivity of 40.747 mV per decade of concentration, repeatability of less than 2% and the percent recovery of 89,7%. Keywords: Flow Injection Analysis, spectrophotometry, potensiometry, simultaneous

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