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Electronic Nose using Gas Chromatography Column and Quartz Crystal Microbalance Rivai, Muhammad; Purwanto, Djoko; Juwono, Hendro; Agus Sujono, Hari
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 9, No 2: August 2011
Publisher : Universitas Ahmad Dahlan

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Abstract

The conventional electronic nose usually consists of an array of dissimilar chemical sensors such as quartz crystal microbalance (QCM) combined with pattern recognition algorithm such as Neural network. Because of parallel processing, the system needs a huge number of sensors and circuits which may emerge complexity and inter-channel crosstalk problems. In this research, a new type of odor identification which combines between gas chromatography (GC) and electronic nose methods has been developed. The system consists of a GC column and a 10-MHz quartz crystal microbalance sensor producing a unique pattern for an odor in time domain. This method offers advantages of substantially reduced size, interferences and power consumption in comparison to existing odor identification system. Several odors of organic compounds were introduced to evaluate the selectivity of the system. Principle component analysis method was used to visualize the classification of each odor in two-dimensional space. This system could resolve common organic solvents, including molecules of different classes (aromatic from alcohols) as well as those within a particular class (methanol from ethanol) and also fuels (premium from pertamax). The neural network can be taught to recognize the odors tested in the experiment with identification rate of 85 %. It is therefore the system may take the place of human nose, especially for poisonous odor evaluations.
Characterization of Polymeric Chemiresistors for Gas Sensor Gunawan, Budi; Rivai, Muchammad; Juwono, Hendro
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 10, No 2: June 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Composite polymer-carbon has resistance change if come into contact with gas. Composite polymer-carbon can be used as a gas sensor. This research will be characterized the sensor composite polymer-carbon that has been made from 6 types of polymer, which are; PEG6000, PEG20M, PEG200, PEG1540, Silicon and Squelene. The 6 sensors will be tested by 9 types of gas, which are; Aceton, Aceton Nitril, Benzene, Etanol, Methanol, Ethyl Aceton, Chloroform, n-Hexan and Toluene. This characterization will be grouped into 4 claster of characteristics, which are; the selectivity (influence type of gas), the sensitivity (influence volume of gas), the influence of temperature and the influence of humidity. Test using method testing sensors that paleced in an isolated chamber which is connected with data acquisition. variations of temperature, humidity, type and volume of gas will be condition in the chamber. Correspondence analysis and regression will be used to process the data. Test results found that each sensor of type of polymers have different sensitivity and selectivity towards a particular type of gas. Resistance sensors increases with rising temperature and humidity environment with a polynomial equation of order-2 and order-3
Characterization of Polymeric Chemiresistors for Gas Sensor Gunawan, Budi; Rivai, Muchammad; Juwono, Hendro
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 10, No 2: June 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

Composite polymer-carbon has resistance change if come into contact with gas. Composite polymer-carbon can be used as a gas sensor. This research will be characterized the sensor composite polymer-carbon that has been made from 6 types of polymer, which are; PEG6000, PEG20M, PEG200, PEG1540, Silicon and Squelene. The 6 sensors will be tested by 9 types of gas, which are; Aceton, Aceton Nitril, Benzene, Etanol, Methanol, Ethyl Aceton, Chloroform, n-Hexan and Toluene. This characterization will be grouped into 4 claster of characteristics, which are; the selectivity (influence type of gas), the sensitivity (influence volume of gas), the influence of temperature and the influence of humidity. Test using method testing sensors that paleced in an isolated chamber which is connected with data acquisition. variations of temperature, humidity, type and volume of gas will be condition in the chamber. Correspondence analysis and regression will be used to process the data. Test results found that each sensor of type of polymers have different sensitivity and selectivity towards a particular type of gas. Resistance sensors increases with rising temperature and humidity environment with a polynomial equation of order-2 and order-3
Islam Politik: Kewajiban dan Tanggung Jawab Umat Juwono, Hendro
Momentum : Jurnal Sosial dan Keagamaan Vol 7 No 1 (2018): Momentum Jurnal Ilmu Sosial dan Keagamaan
Publisher : Sekolah Tinggi Islam Blambangan Banyuwangi

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Abstract

Abstract: The awareness that encourages Muslims to return to the bosom of Muslims, among others, is to carry out politics, namely taking care of Muslim affairs by re-applying Islamic law in domestic and foreign affairs. Awareness born of his belief in Islam as the only complete religion and ideology. It is this awareness that gives birth to belief in Islam, that Islam is the only ideology that must be carried out by all humans so that their lives are kept away from the sadness that befalls and the beliefs that drive them to continue fighting for Islam so that Islam is applied. Therefore, this belief and awareness are the basis of political activity, so that political activity is a manifestation of mind and heart activity. Activities that cannot be killed by any force. But doing Islamization in various dimensions of life, especially regarding how the obligations and responsibilities of the people.
THE INFLUENCE OF Pd IMPREGNATION INTO Al-MCM-41 ON THE CHARACTERS AND ACTIVITY FOR BIOGASOLINE PRODUCTION BY CATALYTIC HYDROCRACKING OF FAMEs FROM NYAMPLUNG SEED OIL (Calophyllum Inophyllum) Juwono, Hendro; Triyono, Triyono; Sutarno, Sutarno; Wahyuni, Endang Tri
Indonesian Journal of Chemistry Vol 13, No 2 (2013)
Publisher : Universitas Gadjah Mada

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Abstract

Biogasoline have been synthesized through catalytic hydrocracking reaction against FAMEs compounds (fatty acid methyl esters) obtained from the transesterification of Nyamplung seed oil. The performance of Al-MCM-41 and Pd/Al-MCM-41 as the catalytic hydrocracking was compared. In this research, the influence of Pd impregnation into Al-MCM-41 catalyst on the characters and catalytic activity has been evaluated. The characters determined were crystallinity by using X-Ray Diffractometer (XRD), Si/Al ratio by Inductively Coupled Plasma (ICP), the acidity by pyridine adsorption, the surface area and pore volume by surface area analyzer and the morphology by Scanning Electron Microscopy (SEM). Catalytic activity was examined for hydrocracking of free fatty acid methyl esters (FAMEs) produced from the transesterification of Nyamplung seed oil, by Hydrogen flowing. The research result showed that impregnation of Pd into Al-MCM-41 has been successfully carried out, which did not destroy the structural morphology of the catalyst. It was also discovered that the Pd impregnation could increase Si/Al ratio and the acidity but it leads to decrease in the catalyst surface area and the volume. Furthermore, Pd impregnated Al-MCM-41 showed superior activity compared to Al-MCM-41 for FAMEs hydrocracking. The superiority was indicated by higher effectiveness and yields selectiveness, that were 100% hydrocarbon composed of C9-C18 that was dominated by C12 emerging the gasoline fraction, compared of that by the results used Al-MCM-41 catalyst that were 97% hydrocarbon consisted of C8-C20 with equal abundance.
Production of Biodiesel from Seed Oil of Nyamplung (Calophyllum inophyllum) by Al-MCM-41 and Its Performance in Diesel Engine Juwono, Hendro; Triyono, Triyono; Sutarno, Sutarno; Wahyuni, Endang Tri; Ulfin, Ita; Kurniawan, Fredy
Indonesian Journal of Chemistry Vol 17, No 2 (2017)
Publisher : Universitas Gadjah Mada

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Production of biodiesel from crude nyamplung oil (Calophyllum inophyllum) have been done by transesterification using Al-MCM-41 catalyst. Al-MCM-41 catalyst was obtained from impregnation of MCM-41 by Al. Sodium aluminate was added to MCM-41 until pH 11.5. The mixture was heated until 110 °C for 5 days. The calcination was performed at 500 °C, and then cooled at room temperature. The Al-MCM-41 obtained was characterized using SAXRD. Morphology of the surface was analyzed using SEM. The metals content were measured using XPS. Performance of Al-MCM-41 to adsorp and desorp nitrogen was also monitored by GSA using BET model. Acidity of the Al-MCM-41 was analyzed by FTIR using absorption of pyridine. The catalytic activity was measured using gas chromatography-mass spectrometry (GC-MS). The chromatogram shows that conversion Nyamplung seed oil to biodiesel is 98.15%. The performance of biodiesel obtained was analyzed by use it to diesel engine. The biodiesel obtained was mixed with commercial diesel fuel in various volume ratios (i.e. 0, 10, 20, 30 and 100%) before used. Viscosity, flash point, boiling point, cloud point, and pour point of the mixtures were characterized. These measuring properties increase with the increase of biodiesel concentration. Optimum engine power was achieved by 10% biodiesel. The mixture of 10% biodiesel has similar characteristic to commercial diesel fuel at load until 1800 watt.
PENGARUH PENAMBAHAN ZINC STEARATE TERHADAP DEGRADASI TERMAL PADA PADUANAKRILONITRIL-BUTADIENA-STIRENADAN POLIPROPILENASERTAKARAKTERISASI MEKANIK DAN INFRA MERAH Y.S., Reni Tri; Juwono, Hendro; Sudirman, Sudirman
Jurnal Sains Materi Indonesia Vol 4, No 3: JUNI 2003
Publisher : BATAN

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PENGARUH PENAMBAHAN ZINC STEARATE TERHADAP DEGRADASI TERMAL PADA PADUANAKRILONITRIL-BUTADIENA-STIRENADAN POLIPROPILENASERTAKARAKTERISASI MEKANIK DAN INFRA MERAH. Perkembangan polimer yang sangat cepat tidak lepas dari kebutuhan hidup manusia yang membutuhkan bahan polimer baru dengan sifat yang lebih baik. Blending (polipaduan) adalah salah satu cara untuk menjawab kebutuhan tersebut, baik tanpa ataupun dengan bahan aditif. Penelitian polipaduan Akrilonitril-Butadiena-Stirena (ABS) dan Polipropilen (PP) dengan penambahan zinc stearate dilakukan untuk mengetahui seberapa besar pengaruh, baik secara fisik maupun kimia, bahan hasil paduan terhadap degradasi termal. Polipaduan ABS dan PP dibuat dengan variasi komposisi 95:5, 80:20, 65:35, 50:50 dengan penambahan 0%, 2%, 4%,dan 6% zinc stearate. Paduan tersebut diproses dengan alat rheomix selama 7 menit untuk komposisi. Bahan hasil proses paduan selanjutnya didegradasi secara termal menggunakan oven dengan suhu 80OC selama 300 jam. Karakteristik bahan polipaduan menggunakan uji mekanik dan infra merah (FT-IR) baik sebelum dan sesudah didegradasi. Dari uji mekanik diperoleh hasil bahwa komposisi 95 : 5 dengan penambahan 2% zinc stearate merupakan komposisi terbaik. Dari uji dengan FTIR diperoleh kesimpulan bahwa bahan setelah di degradasi termal selama 300 jam terjadi degradasi meskipun tidak dapat dihitung nilai indeks karbonilnya.
Novel pH sensor based on fiber optic coated bromophenol blue and cresol red Kurniawan, Fredy; Zulkarnain, Baginda; Hermanto, Mohammad Teguh; Juwono, Hendro; Rivai, Muhammad
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 2: April 2019
Publisher : Universitas Ahmad Dahlan

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Abstract

Fabrication of pH sensor based on fiber optic coated bromophenol blue and cresol red has been done. Briefly, jacket in the middle part of the fiber optic was removed for 5 cm. Then the core of each of fiber optics was washed in ethanol. Nitric acid, demineralized water, and ethanol again consecutively. Then the cleaned core was coated using active material using sol-gel immobilization technique. Tetraehyl orthosilicate was used as a binder in the immobilization of active materials. Bromophenol blue will start change the color to yellow at below pH 3.00±0.01 and blue at above pH 4.60±0.01, while the cresol red will start change the color to yellow at below pH 7.20±0.01 and violet at above pH 8.80±0.01. The pH sensors which have been made show the sigmoidal response over pH from 1.00±0.01 to 11.00±0.01. The sensor has a better performance in comparation with the other sensor.
Membumikan Nilai-nilai Nasionalis-Pancasilais dalam Keluarga sebagai Implementasi Membangun Moderasi Bangsa Juwono, Hendro
Momentum : Jurnal Sosial dan Keagamaan Vol 7 No 2 Mei (2019): Momentum Jurnal Sosial dan Keagamaan
Publisher : Sekolah Tinggi Islam Blambangan Banyuwangi

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Abstract: In the family there are sub-sections starting from father, mother, and child. Togetherness of children with parents before children continue their studies in the context of self-development is enough to determine the attitudes, views, and behavior in the future, because the position of the two parents to children is the first madrasa. Value is an ability that is believed to exist in an object that causes someone and group interest. Whereas according to Dayakisni value is a broad tendency to prefer or choose certain conditions compared to others. So grounding nationalist values ​​is a form of planting values ​​of lovers of the country and the nation, so that with this love someone will automatically search for all information about something he loves in order to protect and defend anyone who tries to disrupt and even undermine the integrity of his nation .  
Catalytic Conversion From Plastic Waste by Silica-Alumina-Ceramic Catalyst to Produce an Alternative Fuel Hydrocarbon Fraction Juwono, Hendro; Tri Sujadmiko, M. Arif; Fauziah, Laily; Ayyun, Ismi Qurrota
Jurnal ILMU DASAR Vol 20 No 2 (2019)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Liquid fuels from polypropylene plastic waste have been successfully performed by catalytic cracking method. The catalyst used is Al-MCM-41- Ceramics. The catalyst was characterized by XRD, SEM, Pyridine-FTIR, N2-Adsorption-Desorption, and the product of catalytic cracking were investigated by gas chromatography-mass spectroscopy (GC-MS). The catalyst was using three times at sample notify A,B and C. The results showed liquid fuels have the largest percentage of gasoline (C8-C12) are 92.76; 91.92 and 90.58 percent fraction produced. The performance of catalyst showed that reuseability number were decrease, but the charactersitic of liquid fuel produced were also be agreeable to commercial gasoline standard. Keywords: olypropylene waste plastics, liquid fuels, catalytic conversion, Al-MCM-41-Cer catalyst, reuseability number.