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.


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