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<![CDATA[PENGARUH PENAMBAHAN MATERIAL PLASMONIK PERAK (Ag) TERHADAP SIFAT FISIS NANOROD ZnODENGAN METODE SEED-MEDIATED HYDROTHERMAL ]]>
<![CDATA[Fera Anggelina]]>;
<![CDATA[Iwantono Iwantono]]>;
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Awitdrus Awitdrus]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 14, No 2 (2017) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.14.2.1041-1047
<![CDATA[Penumbuhan nanorod ZnO dengan tambahan material plasmonik Ag telah berhasil dilakukan dengan menggunakan metode seed-mediated hydrothermal melalui 2 proses: pembenihan dan penumbuhan. Penambahan Ag dilakukan setelah penumbuhan nanorod ZnO yang berlangsung pada suhu 90°C selama 8 jam. Pengaruh penambahan Ag terhadap sifat fisis nanorod ZnO dievaluasi dengan menggunakan teknik karakterisasi XRD, FESEM-EDX dan spektroskopi UV-Vis. Spektrum XRD yang dihasilkan sampel tidak memperlihatkan puncak khusus untuk Ag, namun foto FESEM cukup menampakkan bahwa Ag berhasil masuk ke dalam kisi nanorod ZnO. Hal ini diperlihatkan dengan rusaknya penampang permukaan dari nanorod ZnO, ukuran diameter yang tidak seragam, serta orientasi nanorod yang tidak tegak lurus terhadap substrat. Keberadaan Ag sangat jelas diperlihatkan pada uji EDX dengan persentase berat sebesar 0.2%. Penambahan Ag pada nanorod ZnO berdampak positif, terutama pada sifat optik ZnO. Adanya tambahan Ag menambah rentang daya serap sampel dari UV hingga cahaya tampak. Dengan adanya sifat SPR pada sampel, maka penggunaan material aktif ini pada DSSC sangat dimungkinkan mampu menghasilkan efisiensi yang lebih tinggi.]]>
<![CDATA[PENINGKATAN SENSITIVITAS SENSOR KOIL DATAR MEMPERGUNAKAN SOFT MAGNETIC VITROVAC ]]>
<![CDATA[Tengku Emrinaldi]]>;
<![CDATA[Defrianto]]>;
<![CDATA[Sultan Fiddunya Fiddunya]]>;
<![CDATA[Rahmondia N. Setiadi]]>;
<![CDATA[Lazuardi Umar]]>
<![CDATA[ JOURNAL ONLINE OF PHYSICS Vol. 5 No. 1 (2019): JOP (Journal Online of Physics) Vol 5 No 1 ]]>
Publisher : <![CDATA[Prodi Fisika FST UNJA ]]>
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DOI: 10.22437/jop.v5i1.7986
<![CDATA[This study reports the design of non-magnetic plate thickness sensors based on Eddy Current principld in the form of flat coils. The principle used in the Eddy Current sensor is a change of mutual coil inductance due to the presence of objects in the magnetic field. The coil is made up of single and double layer coil designed using Corel Draw Software based on printed circuit board (PCB) material with dimensions of 152.4 mm x 101.6 mm, which has a track distance of 0.125 m. Single and double layer coil inductance evaluations are carried out using the EVB LDC 1000 L/V Converter module which converts plate thickness into inductance values. The addition of a 30 mm Vitrovac thin film mounted in the direction of the winding in the 2 mm diameter coil core has been carried out to increase the sensitivity value of the sensor which gives an increase in sensitivity value of S = 0.321 uH / mm or 33.2%. The coil is able to measure plate thickness up to 10mm well.]]>
<![CDATA[PENGARUH VARIASI SPEKTRUM CAHAYA LED TERHADAP VITALITAS ALGA CHLORELLA KESSLERI DAN CHLORELLA SP UNTUK BIOCHIP-G BIOSENSOR ]]>
<![CDATA[Febyola Aswandi]]>;
<![CDATA[Lazuardi Umar]]>
<![CDATA[ JOURNAL ONLINE OF PHYSICS Vol. 6 No. 1 (2020): JOP (Journal Online of Physics) Vol 6 No 1 ]]>
Publisher : <![CDATA[Prodi Fisika FST UNJA ]]>
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DOI: 10.22437/jop.v6i1.10402
<![CDATA[Penurunan kualitas sumber daya perairan menjadi masalah khusus dalam beberapa tahun ini, yang ditandai dengan menurunnya jumlah oksigen terlarut (Dissolved Oxygen – DO) sebagai indikator pencemaran air pada sistem perairan. Penelitian ini menyajikan suatu modul biosensor dengan prinsip kerja amperometris yang terintegrasi dalam suatu microchip yaitu biochip-G yang dapat mendeteksi produksi DO melalui proses fotosintesis mikroalga. Sel alga Chlorella kessleri dan Chlorella sp digunakan sebagai bioindicator pengenal polutan yang di stimulasi menggunakan cahaya artifisial LED bulb 149 µmolm2/s berwarna biru (480 nm) dan merah (650 nm). Penelitian ini bertujuan untuk mengetahui perbandingan potensial yang dihasilkan kedua jenis alga saat disinari cahaya LED. Hasil menunjukkan bahwa alga Chlorella sp lebih sensitif dibandingkan alga Chlorella kessleri yang ditandai dengan potensial minimum yang dihasilkan saat Chlorella sp disinari LED spektrum biru dan merah berturut – turut sebesar 1599 mV dan 1478 mV, sedangkan potensial minimum Chlorella kessleri berturut turut yaitu sebesar 1758 mV dan 1738 mV.]]>
<![CDATA[DESAIN SISTIM AUTOMATISASI POMPA PENGISI KONTAINER BERDASARKAN ZONA LINEAR KURVA R(T) SENSOR PTC ]]>
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Beny Agustirandy]]>
<![CDATA[ JOURNAL ONLINE OF PHYSICS Vol. 6 No. 2 (2021): JOP (Journal Online of Physics) Vol 6 No 2 ]]>
Publisher : <![CDATA[Prodi Fisika FST UNJA ]]>
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DOI: 10.22437/jop.v6i2.13269
<![CDATA[Sensor PTC (Positive Temperature Coefficient) merupakan perangkat elketronika yang memiliki kepekaan terhadap perubahan suhu. PTC merupakan jenis termistor yang merupakan singkatan dari termal resistor yang berarti bahwa perubahan termal (suhu) mengakibatkan perubahan resistansi. PTC memiliki karakteristik resistansi naik ketika suhu lingkungan meningkat. Proses peningkatan resistansi ketika suhu lingkungan meningkat mengakibatkan arus yang melewati termistor akan semakin kecil. Berdasarkan hal tersebut maka sistem automatisasi pompa serta deteksi suhu dibuat menggunakan data perubahan resistansi dari termistor PTC yang dibuat melalui pengukuran nilai arus dan tegangan. Perangkat automatisasi dibuat dengan tegangan konstan 12V yang menghasilkan nilai resistansi PTC sebesar 480,71 Ω (pompa ON) pada medium udara dan medium air sebesar 102, 86 Ω (pompa OFF), dengan tingkat aukurasi mencapai 80%. Sistem deteksi suhu dilakukan pada tegangan 0V agar tidak suhu fluida yang diukur sensor murni suhu medium tanpa pengaruh pemanasan sensor akibat pemberian tegangan. Kurva R(T) yang dihasilkan di linearisasi sehingga mendapatkan persamaan linear sebagai dasar konversi resistansi menjadi suhu dengan gradien sebesar -1,01, offset 202,21 dan standar deviasi 10,8. Data yang dihasilkan diprogram dan disimpan pada histori mikrokontroler sebagai automatisasi dan deteksi suu secara simultan.]]>
<![CDATA[PENGEMBANGAN DETEKSI ONLINE GAS KARBONDIOKSIDA MENGGUNAKAN CO2 METER VOLTCRAFT CM-100 ]]>
<![CDATA[Sri Handayani]]>;
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Rahmondia Nanda Setiadi]]>
<![CDATA[ Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 2 (2015): Wisuda Oktober 2015 ]]>
Publisher : <![CDATA[Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam ]]>
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<![CDATA["> Air pollution is one of environmental contaminations occurred by various factors, outside and inside the room. Based on NIOSH (National Institute for Occupational Safety and Health), the safe level of Carbondioxide for humans is less than 1000 ppm. In this study one sample component is developed that can measure and monitor the levels of Carbondioxide, and a moisture level inside the room by online service. this uses a Carbondioxide meter and SHT11 sensor-based microcontroller ATmega8535. The development of Carbondioxide consists of two stages of process, namely, a design and construction of the air quality monitoring systems, and data acquisition. There are four scenarios for collecting data smoky weather, rain weather, measurements of carbon dioxide levels in the room with variations of ventilation and variations in the number of occupants in the room. The research sucsesfully designs the component. It can be seen from the amount of Carbondioxide stage and humidity levels. The amount of Carbondioxide concentration on the smoke state the maximum is 621 ppm while the minimum value is 426 ppm. For intersection of accupant and ventilation variable, the maximum and minimum Carbondioxide is 1535 ppm and 467 ppm respectively. The moisture measurement scenario with SHT11 sensor for smoky weather has maximum value at 83.9%, the moisture with a minimum is at 71.0%, on the rain weather maximum value obtained at 85.8% and 77.3% for minimum. While the occupant’s variation and variation of ventilation obtained maximum humidity value at 82.7% with a minimum value at 68.7%.]]>
<![CDATA[SISTEM AKUISISI DATA MULTI KANAL UNTUK PENGAMBILAN DATA SENSOR SECARA SIMULTAN ]]>
<![CDATA[Veronika Siallagan]]>;
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Rahmondia Nanda]]>
<![CDATA[ Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015 ]]>
Publisher : <![CDATA[Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam ]]>
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<![CDATA[This research aims to operate an instrument system acquisition data multi channel by measuring the humidity sensors grounded by using gypsum. The censorship is made of gypsum material printed as cylindrical shape with a diameter (d) of 18 mm and length (l) of 20 mm. The circuit of main equipment uses microcontroller based on ATmega8 that can operate from 2.7 Volt until 5.5 Volt. It can be passed by the current of 3.6 A and integrated to ADC type ADS7822 and DAC7611 with high voltage of 4.96 volt. The circuit of programme uses an application WinAvr with Language C. By operating the instrument system, the acquisitions data 16 channels tested at agricultural land from the regions Kartama. The circuit was operated on moisture land of 15%, 20%, 25%, and 30% compared with Lutron Kallibrator. After testing that equipment a general Equation was obtained, where this mathematical model can describe the relationship between the electrodes of voltage (Uo) of moisture land (èw). The Equation obtained from the testing is the empirical solution depending on soil type.]]>
<![CDATA[AUTOMATISASI KALIBRASI SENSOR SUHU PTC DAN NTC MEMPERGUNAKAN SUMBER TEGANGAN TERPROGRAM DAC7611 ]]>
<![CDATA[Herman Syahputra]]>;
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Rahmondia Nanda Setiadi]]>
<![CDATA[ Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014 ]]>
Publisher : <![CDATA[Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam ]]>
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<![CDATA[A system calibration of PTC and NTC temperature sensor using a preprogrammable voltage source based on DAC7611 was designed. Temperature sensors of PTC typethermistor used was a type of RS and NTC type was B57962 S282 using a standard voltage divider with resistance to both sensors. Sensor voltage was increased with a step interval of 1V and time equilibrium sensors of 120 s. The characteristic of the sensor were modeled in the form of the curve I(U) based on the self-heating effect (Self-Heating). Results of measurements and modeling using automatic and manual calibration showed two curves coincided, but there was a difference of 5,8mA maximum current for the PTC sensor and 0,552mA for NTC sensor. These resultsindicated that the manufacturing of automatic calibration system worked and only had a small difference to the manual calibration. This was due to the difference in temperature of the ambient.]]>
<![CDATA[FRUIT SWEETNESS CHARACTERIZATION USING IMPEDANCE SPECTROSCOPY METHOD ]]>
<![CDATA[Rahmondia N Setiadi]]>;
<![CDATA[Lazuardi Umar]]>
<![CDATA[ Spektra: Jurnal Fisika dan Aplikasinya Vol 4 No 2 (2019): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 4 Issue 2, August 2019 ]]>
Publisher : <![CDATA[Program Studi Fisika Universitas Negeri Jakarta ]]>
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DOI: 10.21009/SPEKTRA.042.04
<![CDATA[The processing of agricultural products requires technology implementation to increase its production. One way of this technology implementation to increase the production is fruit sweetness measurement, which can be used as a sorting tool of fruit products. The sorting process using this tool can be done with easier way compare than the manual and destructive test. The fruit sweetness is composed of a mixture of sweet molecules fructose, glucose, and sucrose. The measurements of these molecules are usually done with four-point probe and use dc current. In this study, a fruit sweetness characterization using impedance spectroscopy method has been developed and realized, which uses an ac current. By using this method, fruit sweetness level can be characterized based on the impedance measurement on the flesh of a test fruit based on its dielectric properties. The obtained characterization results show that the fruit sweetness level can be measured by the impedance measurement. The obtained impedance is proportional to the concentration of the sweet molecule glucose. This method can characterize the fruit sweetness well and agrees with the calibration result. Therefore, this method can be used to increase agricultural products.]]>
<![CDATA[BIOSENSOR SYSTEM DESIGN FOR DISSOLVED OXYGEN MEASUREMENT USING CURRENT MIRROR CIRCUIT ]]>
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Rahmondia N Setiadi]]>;
<![CDATA[Arfianti]]>;
<![CDATA[Tetty M Linda]]>
<![CDATA[ Spektra: Jurnal Fisika dan Aplikasinya Vol 4 No 2 (2019): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 4 Issue 2, August 2019 ]]>
Publisher : <![CDATA[Program Studi Fisika Universitas Negeri Jakarta ]]>
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DOI: 10.21009/SPEKTRA.042.05
<![CDATA[A biosensor system using a current mirror circuit has been designed and characterized. Biosensor system usually implements an amperometric circuit such as a trans-impedance topology to measure current flowing in the solution due to the contained dissolved oxygen. The trans-impedance circuit implemented for the biosensor has some drawbacks and disadvantages. The implementation of this circuit exhibits rather high noise, besides the impracticality of the power supply used due to bipolar voltage need to allow negative voltage output. In this paper, a classical current mirror circuit is used to convert the flowing current in the solution. The use of the classical current mirror circuit is aimed to obtain lower noise level, besides the easiness in providing the power supply for the system, since the circuit consists only of small number of active components and does not need a bipolar power supply. The measurement is performed utilizing an algae species as a bio-receptor for the measured dissolved oxygen. By utilizing this circuit, the biosensor measurement system can be optimized with better precision and noise performance. Consequently, the dissolved oxygen measurements can be improved and achieve good results. Besides, the system can detect the changes in dissolved oxygen due to the photosynthetic process of the algae.]]>
<![CDATA[MULTI-CHANNEL FRY COUNTER DESIGN USING OPTOCOUPLER SENSOR ]]>
<![CDATA[Lazuardi Umar]]>;
<![CDATA[Yanuar Hamzah]]>;
<![CDATA[Rahmondia N Setiadi]]>
<![CDATA[ Spektra: Jurnal Fisika dan Aplikasinya Vol 4 No 2 (2019): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 4 Issue 2, August 2019 ]]>
Publisher : <![CDATA[Program Studi Fisika Universitas Negeri Jakarta ]]>
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DOI: 10.21009/SPEKTRA.042.06
<![CDATA[This paper describes a design of a fry counter intended to be used by consumption fish farmer. Along this time, almost all the fry counting processes are counted by manual, which is done by human. It is requiring much energy and needs high concentration; thus, can cause a high mental and emotional exhaustion for the fry counting worker. Besides that, the human capability and capacity for counting the are limited to a low number. A fry counter design in this study utilizes a multi-channel optocoupler sensor to increase the counting capacity. The multi-channel fry counter counting system is developed as a solution to a limited capacity of available fry counter. This design uses an input signal extender system for the sensor. The design is based on the interrupt combiner to accommodate multi-channel sensor used. Besides, the transmitter beam's angle is adjusted to deal with the deflection due to water surface. From the experiment, multi-channel sensor can be implemented and high accuracy level could be obtained on the counting and channel number detection, therefore, this design can be implemented and could help farmers to increase the production capacity of consuming fish.]]>
