Daftar accepted manuscript:


Determinasi Kandungan pada Campuran Lemak Babi dengan Sapi menggunakan Spektroskopi Inframerah Dekat dan Partial Least Square Regression

Author(s):  Rizki E. Agustin, Nur A. Wibowo, dan Ferdy S. Rondonuwu

ABSTRAK: Fat is one of important elements for human’s body. Therefore, fat is often added as one of main ingredients both in food industry activity and in cosmetic products. In this study, another technique was done to make an assumption about the content of fat by using Near Infrared Spectroscopy, NIRS and it was followed by Partial Least Square Regression, PLSR. This assumption was done by making 21 samples with the pork fat percentage toward the cow fat (w/w), which was0,00, 0,05 until 1,00with the interval of 0,05. This calibration model was developed using 11 samples of even concentrate and it was validated by using 10 samples of odd concentrate. The infra-red spectrum used in this study was around 4.000-10.000 cm-1. Prior data treatment covered smoothing, normalizing, the first, and the second derivative which were used to optimized the developed PLSR-NIRS prediction models. The second descending spectrum was used to increase the spectrum resolution before PLS analysis was done. Overall, the NIRS and PLSR techniques were sucessful in showing the percentage of the content in the mixted samples of pork and cow fat.

Uji Aktivitas Antibakteri dan Permeabilitas Membran Hibrid Nilon-TiO2

Author(s):  Binti Istikomatul Isrofiyah, Wenny Maulina*) dan Supriyadi

ABSTRAK: Hybrid membranes from nylon and titanium dioxide (TiO2) were prepared using hydrogen chloride (HCl) as precursor and acetyl aceton as chelating agent in the casting solution by phase inversion methods. The aim of this study was investigated antibacterial effect and permeation flux due to the impact of TiO2 contents on the hybrid membranes. Among all the prepared membranes, nylon-TiO2 hybrid membranes with mass fraction 70%:30% exhibited the best antibacterial effect. Meanwhile, the additions of TiO2were raised water and sodium chloride (NaCl) permeability from 0 to 40%.

Pencitraan Inframerah Dekat dari Lemak Sapi pada Model Lemak Tissue

Author(s):  Chrisli Elfri Sahuleka, Jodelin Muninggar, dan Ferdy S. Rondonuwu

ABSTRAK: All women concern for their beauty. Some ways are done to obtain beauty with the use of creams, routine care in beauty clinics, up to plastic surgery by having liposuction on the desired part of the face. In the early procedures of plastic surgery, a 2-4cm incision is made on the skin before sucking the fat out. This cutting can cause various risks. Therefore, a non-destructive method is needed to identify the position of fat as a pre-plastic surgery procedure. Near Infrared Spectroscopy is a method for quickly and precisely identifying and measuring a sample without damaging it. This study aims to determine the area spectral and or wavelength sensitivity for fat and several other important components and todeterminethe position offatfrom a one-dimensional image.The results show that the location of fat is in position 11-28. From this, it can be concluded that NIRS can inform the position of fat from a one-dimensional image.

Interpretasi Batuan BawahPermukaan Prospek Bijih Besi di Kawasan Desa Pagubugan dan Desa Pagubugan Kulon Kecamatan Binangun Kabupaten CilacapBerdasarkan Survei Magnetik

Author(s): Adib Meiditha Wibowo,Sehah, dan Sukmaji Anom Raharjo

ABSTRAK: Geophysical exploration to determine the potential of iron sand in the Pagubugan Village and Pagubugan Kulon Village areas, District of Binangun, Regency of Cilacap has been carried out from May to August 2018 using the magnetic method. The acquisition of magnetic data has been done in the research area at the geographical position stretching from 109.2988° E to 109.31892° E and 7.68430° S to 7.70402° S. Morphologically, the research location is the part of the easterncoastal in the district of Binangun. The results of the modeling and interpretation of magnetic anomaly data that obtained indicate the presence of rockdeposite which thought to contain iron ore which intersects with clay, silt, sand, gravel, and crust from the Alluvium formation with a magnetic susceptibility value of 0.0094 cgs units. This rockdeposite is estimated to lie at a depth of 0 to 53 meters and stretches at the geographical position from 109.30981° E and 7.69264° S to 109.31787 °E and 7.69575° S.

Blood Pressure Monitor Design Using MPX5050GP Pressure Sensor and Visual C# 2010 Express

Author(s):  Ayu Jati Puspitasari, Endarko, Iim Fatimah

ABSTRAK: Blood pressure monitor (BPM) usingoscillometric method with MPX5050GP pressure sensor has been successfully fabricated and calibrated. Oscillometric method ismeasurement method to observe cuff pressure oscillations. In this study, the oscillometric waveform measured by fabricated BPM used Arduino Uno which processes pulse rate, systolic and diastolic pressures. Measurement results of pulse rate, systolic and diastolic pressures will be displayed and recorded inapplication designed using Visual C# 2010 Express. Fabricated BPM capable of measuring pulse rate and blood pressure in the range of 40-260 mmHg withratio of systolic and diastolic pressures were achieved 0.48 and 0.78, respectively. The system has an average error of systolic pressure, diastolic pressure, and pulse ratewere -4.38 mmHg (2.72%), 0.10 mmHg (5,55%), and 4.48 bpm (6.07%).

Kinetika Reaksi Proses Pirolisis Pada Sekam Padi

Author(s): Casnan, Erliza Noor, Hartrisari Hardjomidjojo, Irzaman, Eti Rohaeti

ABSTRAK: This study aims to determine the reaction kinetics of the rice husk pyrolysis process by analyzing the characteristics of the Thermogravimetry Analysis (TGA) curve. Characteristics of the TGA Curve describes the process of losing mass to the temperature in the pyrolysis process with various stages of material phase changes due to the heating process. The pyrolysis process is influenced by temperature, time, and heating rate, so by analyzing the temperature, time and heating rates, the reaction kinetics will be obtained. The kinetic reaction of the pyrolysis process based on the Arrhenius equation, the speed of the decomposition reaction is influenced by changes in mass or mass fraction per unit time. Exponential factor value (A) will affect the speed of reaction of the pyrolysis process, the greater the value of A, the greater the reaction speed and vice versa. Value (A) in the pyrolysis process of HCl washed and heated rice husk, the value is smaller when compared with the value of A process of rice husk pyrolysis without washing and heating.

Sintesis Ca2P2O7 dari Limbah Kerang dengan Metode Solvothermal

Author(s): Faisal Akbar, Retno Kusumaningrum, Mi’rajShabrin Jamil, Alfian Noviyanto

ABSTRAK: Synthesize of calcium pyrophosphate (CPP) was made using solvothermal method followed by heat treatment. Source of calcium carbonate using green shells waste and blood clams waste. CaO was obtained by decompose calcium carbonate at 1000°C for 2 hours in air atmosphere. CaO powder was mixed with H3PO4 to synthesize CaHPO4 using solvothermal method at 130°C for 16 hours. Calcium pyrophosphate was obtained after heat treatment of CaHPO4at 800°C for 2 hours.However, impurity phases were observed for calcium pyrophosphate from green shells waste. Moreover, the average particle size of calcium pyrophosphate from green shells waste was 1.5 ± 0.8 µm compared to 258 ± 294 nm of blood clams waste.


Efek Pemanasan Pra-kompaksi dan Sinter terhadap Sifat Kuat Tekan Komposit Al/SiC

Author(s): Mashuri* dan I. Mufidah

ABSTRAKResearch on the effects of pre-compacting heating on Aluminum (Al) matrix and sintering on the density and compressive strength of Al/SiC composites made using powder metallurgy method. The synthesized of Al/SiC composites was began by heating pre-compacting of Al matrix at temperatures of 40, 60, and 80C within 1 hour, mechanically compacting and sintering at temperatures of 400, 500, and 600C. In order to increase the homogeneity of pressure during compacting throughout in the composites, non-reactive and volatile zinc stearate was used. Phase and morphological identification were carried out using X-rays Diffractometry (XRD) and Scanning Electron Microscope (SEM) devices. The density and porosity were measured by the Archimedes method and the compressive strength was tested by the Torsee Universal Testing Machine. The results showed that pre-compacting in the Al matrix with the temperature of 60C and sintered temperatures up to 500C can increase the density and the compressive strength of Al/SiC composites prepared by powder metallurgy method. Sintering process can give a new phase -Al2O3 in the surface area contact of Al-SiC which can strengthen interfacial bonds and reduce porosity so that the density and the compressive strength increase. 

Keunggulan Ekstraksi Fitur Ordo Kedua terhadap Ordo Pertama dalam Identifikasi Ciri Berbasis TeksturWarna

Author(s): M. Arief Bustomi

ABSTRAK: The feature extraction method for identifying color-based characteristics has been widely applied to various fields of human life. For example in agriculture, this method can be used to carry out the process of identifying fruit maturity based on fruit skin turtles. The feature extraction method is done by first converting RGB images into grayscale images. Based on the grayscale image, two different processing methods are carried out, namely first order feature extraction and second order feature extraction. The extraction features of the first order used 5 characteristic parameters, namely Mean, Variance, Skewness, Kurtosis, and Entropy, while the feature extraction of the second order used 6 characteristic parameters, namely Angular Second Moment, Contrast, Correlation, Standard Deviation, Inverse Difference Moment and Homogenity . The 11 characteristic parameters will then be classified using the LVQ artificial neural network method to find the final weight used as the reference weight for color texture-based character identification. This paper discusses the results of research on identifying color textures in three different cases. In each case 30 image samples were used (consisting of two categories each of 15 image samples) which were divided into 16 image samples for training and 14 image samples for testing. The results showed that the second order feature extraction method was always superior to the first order feature extraction method in the ability to identify color-based traits in each case.



Analisis Resolusi Spatial Citra Ultrasonografi (USG) pada Arah Tangensial Radiasi Citra menggunakan Phantom Berbasis Silicon Rubber

 Author(s): Victory Immanuel Ratar, Surya Suryasatriya Trihandaru, dan Giner Maslebu

ABSTRAK:Ultrasound is widely used in diagnostic imaging, therefore quality control (QC) of ultrasound images is important. One of the QC parameter is spatial resolution that can be analyzed by calculating the distance between two nearby object in the tangential direction of radiation. The image that is produced by the curved array transducer will produce a circular shaped image and the coordinates of the object isnt in the cartesian coordinate system because it adapts to the surface of the transducer.The image must be transformed with a circle equation approach to calculate the distance between two nearby object. This study was using a Mindray 3D ultrasound model: DP- 10 with transducer model: 35C50EB, and phantom instruments made from a mixture of 99 ml silicon rubber and 1 ml catalyst. The acquisition data used a fixed frequency of 4.5 MHz, fixed gain of168 dB, and fixed depth of 3,3 cm. The result found that the measurement of objects in A area was (0.85 0.01) cm,B area was (0.62 0.07) cm, and C area was (0.48 0.06) cm. The values obtained still meet the standards set by American Association of Physicist in Medicine (AAPM).

Inspeksi Material menggunakan Mikro-Radiografi Sinar-X Digital melalui Pengukuran Densitas

Author(s): Prasetyo Listiaji dan Gede Bayu Suparta

ABSTRAK:X-ray digital radiography is a non-destructive digital imaging technique that utilizes X-ray radiation that penetrates material objects. This technique can be used to analyze the internal structure and composition of objects properly. Research has been carried out on material inspection using X-ray digital micro-radiography that has been developed in the Physics Department, FMIPA UGM. Material samples inspected were2B and HB pencils. All samples were irradiated by X-rays with a tube voltage of 30 kV and a filament current of 20 mA. Several images were taken for each sample, then averaged and calculated the grayscale value (intensity). Density was calculated based on variations in the intensity difference that passes through the pencil. The radiographic image showed that the internal structure of the pencil object, were wood and graphite can be distinguished. The measurement results were obtained for HB pencils, the value of the graphite density of HB pencils was (2.52 0.02) g/cm3 and graphite density of 2B pencils was (1.84 0.02) g/cm3. The results of density different between HBgraphiteand 2B graphite indicate that X-ray radiography techniques can be an alternative for material inspection purposes and density measurement.


Audio Bio Harmonic with WT5001 Smartchipusing Solar Cell

Author(s): Nur Kadarisman, Fitria Ayu Sulistiani, Wipsar Sunu Brams Dwandaru, Rhyko Irawan Wisnuwijaya, dan Agus Sugiarto

ABSTRAK: The design of audio bio harmonic (ABH) with smartchip WT5001 using solar cell technology in the form of ABH instrumentation with an electricity resource derived from solar energy has been successfully created and tested, which includes (i) testing the peak frequency of sound and sound output, and (ii) emptying and charging tests to determine the effectiveness of the use of the solar cell as the power provider. The ABH system consists of (i) a sound generator device composed of WT5001 sound modules, amplifiers, and horn speakers, and (ii) structured power supply devices for solar cell modules, charger controllers, and batteries for storing power. The test results of the peak frequency for the insect (garengpung) sound files and the output sound of the ABH device indicate a deviation of peak frequency of 13.46 Hz to140.81 Hz. The 15 hours emptying test results in on mode with battery charging for 7 hours shows that the use of 10Wp solar cell is effective to provide electrical powerin ABH tool operation.

The synthesis of TiO2 nanoparticles powder by Milling and Coprecipitation Mixed Method

Author(s): Maya Puspitasari Izaak, Yohanes Edi Gunanto, dan Henni Sitompul

ABSTRAK:Ilmenite type Fe2O3 waste (which is processed from natural iron sand) was processed into TiO2 nanoparticles powder carried out by leaching with HCl and then using high-energy milling (HEM) for 50 hours. The characteristics of the powder such as particle size, size distribution and phases were analyzed using various techniques such as XRD, SEM, EDS and particle size analyzer. Synthesis and characterization of ilmenite type iron sand have been successfully made into TiO2 by milling and coprecipitation mixed method. The purity level of TiO2 was obtained by 85.01%. Particle size of TiO2 was approximately 500 nm.

Karakterisasi Stabilitas Termal Kaolin Tatakan Kalimantan Selatan

Author(s):  Muhammad Saukani, Izzatus Sholehah, Saifullah Arief, dan Sadang Husein

ABSTRAK:This research is to characterize thermal stability of Kaolin from Tatakan, South Borneo. This research have been done by discussing the thermal treatment provided for kaolin clay and it used as a geopolymer base material. The FTIR, DSC-TGA, and XRD characterize the prepared kaolin clay. The DSC-TGA analysis shows that predehydroxylation occurred at temperatures of 50-120 ° C. In addition,  the dehydroxylation process started at 430 - 650° C.  However, the most stable condition is at 700 - 900 ° C. Calcination temperature at kaolin clay was given at 650° C, 750 ° C, and 850 ° C with dwell time of 1, 3, and 5 hours. After that, the calcination clay had characterized by FTIR and XRD. The FTIR results showed that all thermal treatments of metakaolin have formed. It was marked by the loss of the characteristic peak of kaolin with wavenumbers of 3600 cm-1 and 1600 cm-1. Thermal treatment at a temperature of 750 ̊ C with a holding time of 3 hours showed the largest amorphous phase formed, which was characterized by a decrease in the highest percentage of transmittance. The crystalline peak of kaolin XRD data at 750 ̊C shows that the peak of the crystalline phase of kaolinite was lost. It indicates that metakaolin has formed. Based on the results, it shows that the optimum thermal temperature that given to the kaolin Tatakan to create reactive metakaolin is 750 ° C for 3 hours.



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