Articles
<![CDATA[Pengaruh Variasi Siklus Freezing-Thawing Pada Performansi Elektroda Karbon Dalam Sistem Capacitive Deionization ]]>
<![CDATA[Diani Ainun Nisa]]>;
<![CDATA[Endarko Endarko]]>;
<![CDATA[Iim Fatimah]]>
<![CDATA[ Jurnal Sains dan Seni ITS Vol 5, No 2 (2016) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS ]]>
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DOI: 10.12962/j23373520.v5i2.18735
<![CDATA[Elektroda karbon dari bahan karbon aktif dengan metode freezing thawing telah berhasil disintesa dan dikarakterisasi. Penelitian ini bertujuan untuk mengetahui nilai kapasitansi dan peformansi dari sistem capacitive deionization (CDI) dengan variasi siklus freezing thawing. Dalam penelitian ini menggunakan variasi siklus yakni 3, 4 dan 5 siklus. Selain variasi siklus, diteliti juga perbandingan performasi elektroda karbon menggunakan karbon aktif dimodifikasi dengan HNO3 dan tidak dimodikasi. Karakterisasi dilakukan melalui uji Cyclic Voltammetry (CV) dan uji Electrical Impedance Spectroscopy (EIS). Dalam uji CV elektroda karbon modifikasi memiliki nilai spesifik kapasitasi (26,78 F/g)lebih besar jika dibandingkan elektroda karbon tanpa modifikasi (22,77 F/g), keduanya dalam 5 siklus freezing-thawing. Hasil desalinasi, didapatkan pengurangan kadar garam 596 μs/cm NaCl untuk sistem CDI dengan tegangan sumber 1,9 V yaitu sebesar 55,70 % untuk karbon modifikasi dan 24,80 % untuk elektroda karbon tanpa modifikasi. ]]>
<![CDATA[BAND-PASS FILTER CIRCUIT DESIGN FOR MULTI-FREQUENCY ELECTRICAL IMPEDANCE TOMOGRAPHY SYSTEM ]]>
<![CDATA[Ayu Jati Puspitasari]]>;
<![CDATA[Endarko Endarko]]>
<![CDATA[ Jurnal Forum Nuklir JFN VOL 13 NO 1 MEI 2019 ]]>
Publisher : <![CDATA[BATAN ]]>
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DOI: 10.17146/jfn.2019.13.3.5631
<![CDATA[BAND-PASS FILTER CIRCUIT DESIGN FOR MULTI-FREQUENCY ELECTRICAL IMPEDACE TOMOGRAPHY SYSTEM. Electrical Impedance Tomography (EIT) is one of the emerging imaging technologies recently. The principle of EIT system is inject electric current into impedance object and measure the voltage based on the electrodes array. The current source that precise, stable, and wide-bandwidth is required to obtain voltage measurements accurately. The current source used for this EIT system is Voltage-Controlled Current Source (VCCS). The VCCS block circuit consists of several circuits, one of them is a filter circuit. The suitable filter for multi-frequency EIT system is band-pass filter. This research has been designed and fabricated a band-pass filter with cut-off frequency 1 and 250 kHz, which is using Butterworth coefficient, unity gain, and Sallen-Key topology.]]>
<![CDATA[Pengaruh Variasi Topologi Elektroda terhadap Kadar Ozon yang dihasilkan oleh Generator Ozon ]]>
<![CDATA[Yugo Triawanto]]>;
<![CDATA[E Endarko]]>
<![CDATA[ Jurnal Fisika dan Aplikasinya Vol 12, No 1 (2016) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS ]]>
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DOI: 10.12962/j24604682.v12i1.1327
<![CDATA[Generator ozon dengan variasi topologi elektroda telah berhasil dibuat untuk mengetahui pengaruhnya terhadap jumlah kadar ozon yang dihasilkan. Desain generator sehingga menyebabkan terjadi lucutan elektron yang banyak menjadi sebuah pilihan untuk mendapatkan penghasil ozon yang optimal. Desain topologi elektroda yang dipilih dalam penelitian ini adalah elektroda koaksial dan strip bidang. Kedua elektroda ini dibandingkan kemampuan dalam menghasilkan ozon dengan frekuensi 11,9 KHz. Variasi dimensi dilakukan pula pada kedua jenis elektroda, masing-masing terdapat tiga variasi dimensi untuk mengetahui pengaruhnya terhadap kadar ozon yang dihasilkan. Generator ozon elektroda strip bidang menghasilkan ozon terlarut sebesar 2,87 mg sedangkan generator elektroda koaksial 2,17 mg.AbstractOzone generators with electrodes topological variations have been constructed to determine of the effect on the amount of ozone levels produced. Design led to a discharge electrons which are becoming an option to obtain optimal ozone producer. Topology design of electrodes selected in this study is the coaxial electrodes and strip plane. Both of these electrodes are compared in terms of the ability to produce ozone with frequency 11,9 KHz. Dimension variation performed well on both types of electrodes, there are three dimensions for each variations to determine its effect on the levels of ozone generated. Ozone generators with electrode of the strip plane produce ozone dissolved by 2.87 mg while the electrode coaxial 2.17 mg.]]>
<![CDATA[Pengaruh Ketebalan Lapisan TiO2 terhadap Performasi Dye Sensitized Solar Cells ]]>
<![CDATA[Nurrisma Puspa]]>;
<![CDATA[Nurul Amalia Silviyanti]]>;
<![CDATA[Gatut Yudoyono]]>;
<![CDATA[Gontjang Prajitno]]>;
<![CDATA[Agus Rubiyanto]]>;
<![CDATA[E Endarko]]>
<![CDATA[ Jurnal Fisika dan Aplikasinya Vol 14, No 1 (2018) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS ]]>
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DOI: 10.12962/j24604682.v14i1.3553
<![CDATA[Dye Sensitized Solar Cell (DSSC) merupakan generasi ketiga dari sel surya. Sel suya jenis ini tersensitisasi zat pewarna. DSSC dibentuk dengan struktur sandwich dimana terdapat lima bagian antara lain : kaca ITO (Indium Tin Oxide) sebagai substrat; TiO2 sebagai bahan semikonduktor; campuran dye (kunyit-manggis-daun alfalfa) sebagai donor elektron; elektrolit gel sebagai transfer elektron dan active carbon sebagai katalis pada elektroda pembanding. Serbuk TiO2 berukuran nanometer didapatkan melalui sintesis dengan metode kopresipitasi. Dari penelitian yang telahdilakukan, efisiensi DSSC dengan ketebalan lapisan TiO2 berukuran 10 µm lebih besar jika dibandingkan dengan ketebalan lapisan 20 µm dan 30 µm. Hasil efisiensi DSSC tersebut yaitu 0.25 % untuk ketebalan lapisan TiO2 berukuran 10 µm , 0.143 % ketebalan lapisan TiO2 berukuran 20 µm, dan 0.195 % untuk ketebalan lapisan TiO2 berukuran 30 µm,]]>
<![CDATA[Analisis Metode Lintasan Feynman pada Interferensi 1, 2, 3, dan 4 Celah ]]>
<![CDATA[Mahendra Satria Hadiningrat]]>;
<![CDATA[Endarko Endarko]]>;
<![CDATA[Bintoro Anang Subagyo]]>
<![CDATA[ Jurnal Fisika dan Aplikasinya Vol 11, No 1 (2015) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS ]]>
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DOI: 10.12962/j24604682.v11i1.777
<![CDATA[Pada paper ini dijelaskan secara rinci analisis gangguan pada 1, 2, 3 dan 4 celah yang didasarkan pada metode lintasan Feynman dalam pendekatan difraksi Fraunhofer. Formulasi pendekatan difraksi Fraunhoffer sulit untuk mendapatkan, sehingga didesain dengan mengaplikasikan prinsip aksi klasik sebagai dasar formulasi awal. Hal ini digunakan untuk menghitung distribusi probabilitas elektron yang melalui celah akibat model gangguan yang terdeteksi di layar dan dinyatakan dalam bentuk grafik.]]>
<![CDATA[Design of low-cost and simple reconstruction method for Three Dimensional Electrical Impedance Tomography (3D-EIT) Imaging ]]>
<![CDATA[Endarko Endarko]]>;
<![CDATA[Ari Bangkit Sanjaya Umbu]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 10 No. 2 (2020) ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n2.p125-136
<![CDATA[Electrical impedance tomography is a non-invasive imaging modality that uses the electrical conductivity distribution to reconstruct images based on potential measurements from the object's surface. The proposed study was to design and fabricate a low-cost and simple reconstruction method for 3D electrical impedance tomography imaging. In this study, we have been successfully developed 3 Dimensional Electrical Impedance Tomography (3D-EIT) system using 16 copper electrodes (Cu) to detect and reconstruct the presence of objects in the Phantom. 3D-EIT was developed using Phantom as a test object with PVC pipe material, with an inner diameter of 7.2 cm and a height of 5.4 cm. Electrodes were arranged in two rings, with each ring having eight electrodes arranged in a planar line. Furthermore, the Gauss-Newton algorithm and Laplace prior regularization were used to image reconstruction of objects inside the Phantom using voltage measurement produced from sequential pairs of neighboring electrodes. The voltage is obtained from the injection of a constant current of 1 mA at 20 kHz into the system's electrode pairs. The objects used in this research are PVC pipe, solid aluminum, PVC pipes filled with wax glue, and copper trusses. The results obtained show that the reconstruction results can provide information about the position, the electrical properties, and the shape of real objects. Finally, the system can detect the location, height, and electrical properties of objects for all variations of angle and height variations.]]>
<![CDATA[The Influence of Multi-frequency Current Injection in Image Reconstruction for Two-Dimensional High-Speed Electrical Impedance Tomography (EIT) ]]>
<![CDATA[Aris Widodo]]>;
<![CDATA[Agus Rubiyanto]]>;
<![CDATA[Endarko Endarko]]>
<![CDATA[ IPTEK The Journal of Engineering Vol 5, No 1 (2019) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian kepada Masyarakat ]]>
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DOI: 10.12962/j23378557.v5i1.a5019
<![CDATA[The image reconstruction for two-dimensional high-speed Electrical Impedance Tomography (EIT) has been successfully studied with multi-frequency current injection. The aim of this study is to get the best image reconstruction under the influence of multi-frequency current injection of this EIT system. In this method, we used current injection at 1 mA with varies of frequency in the range 10 to 50 kHz injected at the practical phantoms with 16 electrodes. Polyvinyl chloride (PVC) cylinder was put in the practical phantom as the anomaly. Then, The boundary voltage of the practical phantom was measured by the voltage measurement circuit. After that, it processed in the computer with Gauss-Newton Algorithm to got image reconstruction. The result showed that the best image reconstruction was achieved at 10 kHz of frequency current injection. The best image reconstruction had more accuracy of shape, position and electrical properties of an anomaly in boundary phantom than another image reconstruction result.]]>
<![CDATA[Analysis of Feedback Parameter with Vibration Sensor on Signal Self-Mixing Interferometry ]]>
<![CDATA[Novi D. Ariyanti]]>;
<![CDATA[Endarko Endarko]]>;
<![CDATA[Agus Rubiyanto]]>
<![CDATA[ IPTEK Journal of Proceedings Series No 1 (2019): 4th International Seminar on Science and Technology 2018 (ISST 2018) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23546026.y2019i1.5118
<![CDATA[In the research aims to analyzed feedback parameter on Self-Mixing Interferometry (SMI) signals. It is because the feedback parameter is one of the determined parameters in SMI vibration sensor research. The experimental apparatus consists of a laser diode as the light source, mirror as a target, collimator as light alignment, and PLX-DAQ as data acquisition executed by Arduino Uno. The principle of data retrieval with the manner of the light source is directed exactly perpendicular to the vibrating target, then reflected and arrested by the detector (photodiode) contained in the laser diode. Light arrested by the photodiode in the form of optical value then automatically converted into voltage value displayed on a personal computer (PC). This feedback on SMI is obtained by variation of the vibration frequency given to a target. The variation of vibration given is 10-100 Hz with 10 Hz increment and each frequency is taken 1000 data. Based on the research that has been done then results obtained at the frequency of 10-30 Hz feedback does not appear because the vibration small so that the vibration sensor is less than optimal. Feedbacks appear at frequencies 40 Hz and 50 Hz but are clearly visible at frequencies 50 Hz. While at 60-80 Hz frequency feedback begins to disappear. The existence of feedback on frequency 50 Hz indicated that vibration sensors on SMI can be applied to industry and medical field]]>
<![CDATA[Community-Based Tourism Transformation: What Does The Local Community Need? ]]>
<![CDATA[Adi Suryani]]>;
<![CDATA[Soedarso Soedarso]]>;
<![CDATA[Deti Rahmawati]]>;
<![CDATA[Endarko Endarko]]>;
<![CDATA[Achmad Muklason]]>;
<![CDATA[Berto Mulia Wibawa]]>;
<![CDATA[Siti Zahrok]]>
<![CDATA[ IPTEK Journal of Proceedings Series No 7 (2020): The 2nd International Conference on Global Development (ICODEV) 2020 ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23546026.y2020i7.9524
<![CDATA[Tourism is a promising development sector. It has strong potentials for improving local community life quality by alleviating poverty, broadening information access, improving facilities and infrastructure, opening new and diversifying employment. Thus, today tourism is recognized as one of key sectors in development possessing multiplier effects on other sectors and contributing to other development goals attainment. This encourages many communities to initiate and run their local-scale tourism at their kampung. The development of these community-based tourisms need to be strengthened by community capacity to develop their tourism into more sustainable and competitive destinations. Moreover, the Covid-19 pandemic potentially threatens tourism existence and sustainability, especially if the communities do not rapidly respond by improving their tourism capacities. This study aims to explore several factors needed by local community to foster tourism transformation. The study is concentrated on examining WPP Dalegan and Dalegan community tourism transformation needs. The data are collected through community dialog incorporated with community service program. The study identifies three primary transformation elements for fostering WPP tourism improvement. The first factor is transformational and collective community leader who provides empowerment, climate and chance for Dalegan community to participate and orients to community social changes. The second factor is Dalegan community capacity building. Dalegan tourism transformation rests on its local community to learn together and improve the quality of their tourism services and products. The third factor is development facilitation. To successfully transform, Dalegan community needs to expand their networking, build horizontal and vertical partnerships.]]>
<![CDATA[Evaluation Treatment Planning for Breast Cancer Based on Dose-Response Model ]]>
<![CDATA[Siti Aisyah]]>;
<![CDATA[Aditya Prayugo Hariyanto]]>;
<![CDATA[Endarko Endarko]]>;
<![CDATA[Agus Rubiyanto]]>;
<![CDATA[Nasori Nasori]]>;
<![CDATA[Mohammad Haekal]]>;
<![CDATA[Andreas Nainggolan]]>
<![CDATA[ Jurnal ILMU DASAR Vol 22 No 1 (2021) ]]>
Publisher : <![CDATA[Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember ]]>
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DOI: 10.19184/jid.v22i1.19732
<![CDATA[The delivery of radiation therapy to patients requires prior planning made by medical physicists to achieve radiotherapy goals. Radiotherapy has a plan to eradicate the growth of cancer cells by giving high doses and minimizing the radiation dose to normal tissue. Evaluation of planning is generally done based on dosimetric parameters, such as minimum dose, maximum dose, and means dose obtained from the DVHs data. Based on the same DVHs, data were evaluate dinterms of biological effects to determine the highest possible toxicity in normal tissue after the tumor had been treated with radiation using the NTCP model. The evaluation was conducted by selecting three DICOM-RT data of post-mastectomy right breast cancer patients who had been prescribed a dose of 50 Gy obtained from the Hospital MRCCC Siloam Semanggi database. All data were processed using open-source software DICOManTX to get the DVH and isodose information. Matlab-based CERR software was used to calculate the NTCP model. The results show that the three patients' DVH and isodose treatment planning result in a homogeneous dose distribution result because the PTV area obtains adose limit of ≥ 95%. Moreover, normalt issue still gets adose below the tolerance limit based on the standard from RTOG 1005 and ICRU 83. Analysis of NTCP shows a complication probability below 1% for each organ, suggesting that any organ which has been irradiated has a low likelihood of complications. Therefore, it can be concluded that the treatment planning which has been made in the three patients using the IMRT technique has achieved the objectives of radiotherapy, which is to minimize toxicity to healthy organs. |Keywords: DVH, isodose, NTCP, radiotherapy.]]>
