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PENGARUH KONSENTRASI BUAH CABAI MERAH (Capsicum annum L.) DAN BUAH CABAI RAWIT (Capsicum frutescens L.) DALAM PRODUKSI BIOGAS DARI SAMPAH ORGANIK Cahyari, Khamdan; Sahroni, Alvin
Jurnal Bahan Alam Terbarukan Vol 3, No 1 (2014): June 2014
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v3i1.3096

Meningkatnya kesejahteraan masyarakat Indonesia berdampak positif bagi peningkatan jumlah pasar tradisional dan komoditas perdagangannya. Namun, permasalahan sampah yang ditimbulkan oleh kegiatan perdagangan tersebut masih belum dapat ditangani dengan baik. Tidak hanya itu, sampah pasar tradisional yang hanya ditimbun di area tempat pembuangan akhir (TPA) telah menyebabkan pencemaran lingkungan berupa kontaminasi air tanah, emisi gas rumah kaca dan masalah kesehatan. Sampah pasar tradisional memiliki potensi yang besar untuk diolah menjadi biogas melalui metode anaerobic digestion. Dengan adanya mikroorganisme, proses ini mampu mendegradasi sampah organik menjadi bahan organik yang stabil dan biogas (metana dan karbondioksida). Salah satu faktor yang mempengaruhi proses tersebut adalah adanya senyawa-senyawa antibiotik yang terkandung dalam sampah. Senyawa capsaicinoid dalam sampah buah cabai merupakan senyawa yang berperan dalam rasa pedas cabai memiliki pengaruh negatif terhadap kinerja mikroorganisme dalam mendegradasi sampah menjadi biogas. Pengaruh konsentrasi buah cabai terhadap produksi biogas ini belum banyak diteliti dan diketahui sehingga perlu dilakukan penelitian untuk menentukan konsentrasi minimal yang menyebabkan proses inhibisi (penghambatan).Hasil penelitian membuktikan adanya pengaruh konsentrasi buah cabai (capsaicinoid) terhadap produksi biogas. Sampah pasar tradisional dengan konsentrasi 8 g VS/liter yang diumpankan terhadap konsorsium mikroorganisme tanpa adanya buah cabai menghasilkan yield biogas yang lebih tinggi dibandingkan dengan sampah yang tercampur buah cabai. Semakin tinggi konsentrasi buah cabai semakin besar pengaruh penghambatannya (inhibition). Hal ini ditunjukkan dengan menurunnya yield biogas yang dihasilkan. Konsentrasi buah cabai yang menghasilkan yield optimal diperoleh pada nilai konsentrasi 5 dan 8 g VS/liter untuk cabai merah dan cabai rawit secara berturut-turut. Yield tertinggi biogas dan gas metana ialahÂ 35 dan 12 ml/g VS (cabai rawit). Persentase reduksi VS relatif cukup tinggi mencapai 75%.The rising of Indonesian welfare has a positive impact towards the number of traditional market and its commodity. However, the problem of waste as a result of the market activity still not handled properly. Moreover, the waste of traditional market which remains in the landfill resulted in pollution such as groundwater contamination, green house emission and also health problems.The waste of traditional market has a big potential to be processed as biogas through anaerobic digestion method. With the presence of microorganism, this process is capable of degrading organic waste into stable organic material and biogas (methane and carbon dioxyde). One of the factor which affecting the process are the antibiotic components contained by the waste. Capsaicinoid which found in chili is the component which responsible to provide the spicy taste, has a negative effect towards the microorganism in degrading the waste into biogas. The effect of chili towards biogas production is not widely known that needs to be investigated, therefore a research needs to be conducted to determine the minimum concentration which resulted in inhibition process. The research result shows the influence of the concentration of chili (capsaicinoid) towards biogas production. Traditional market waste with 8g VS/litre which exposed to microorganism without the existence of chili reulted in higher amount of biogas than the one which mixed with chili. The bigger the concentration of chili, the bigger the inhibition. This is demonstrated by the the decreasing number of the yield of the biogas. The concentration of chili which can resulted in optimal yield production obtained at concentration value of 5 and 8 g VS/ litre for red chili and cayenne pepper respectively. The highest yield of biogas and methane are 35 and 12 ml/g VS (cayenne pepper). The VS reduction percentage is relatively high to 75%.

PENGARUH KONSENTRASI BUAH CABAI MERAH (Capsicum annum L.) DAN BUAH CABAI RAWIT (Capsicum frutescens L.) DALAM PRODUKSI BIOGAS DARI SAMPAH ORGANIK Cahyari, Khamdan; Sahroni, Alvin
Jurnal Bahan Alam Terbarukan Vol 3, No 1 (2014): June 2014
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v3i1.3096

Meningkatnya kesejahteraan masyarakat Indonesia berdampak positif bagi peningkatan jumlah pasar tradisional dan komoditas perdagangannya. Namun, permasalahan sampah yang ditimbulkan oleh kegiatan perdagangan tersebut masih belum dapat ditangani dengan baik. Tidak hanya itu, sampah pasar tradisional yang hanya ditimbun di area tempat pembuangan akhir (TPA) telah menyebabkan pencemaran lingkungan berupa kontaminasi air tanah, emisi gas rumah kaca dan masalah kesehatan. Sampah pasar tradisional memiliki potensi yang besar untuk diolah menjadi biogas melalui metode anaerobic digestion. Dengan adanya mikroorganisme, proses ini mampu mendegradasi sampah organik menjadi bahan organik yang stabil dan biogas (metana dan karbondioksida). Salah satu faktor yang mempengaruhi proses tersebut adalah adanya senyawa-senyawa antibiotik yang terkandung dalam sampah. Senyawa capsaicinoid dalam sampah buah cabai merupakan senyawa yang berperan dalam rasa pedas cabai memiliki pengaruh negatif terhadap kinerja mikroorganisme dalam mendegradasi sampah menjadi biogas. Pengaruh konsentrasi buah cabai terhadap produksi biogas ini belum banyak diteliti dan diketahui sehingga perlu dilakukan penelitian untuk menentukan konsentrasi minimal yang menyebabkan proses inhibisi (penghambatan).Hasil penelitian membuktikan adanya pengaruh konsentrasi buah cabai (capsaicinoid) terhadap produksi biogas. Sampah pasar tradisional dengan konsentrasi 8 g VS/liter yang diumpankan terhadap konsorsium mikroorganisme tanpa adanya buah cabai menghasilkan yield biogas yang lebih tinggi dibandingkan dengan sampah yang tercampur buah cabai. Semakin tinggi konsentrasi buah cabai semakin besar pengaruh penghambatannya (inhibition). Hal ini ditunjukkan dengan menurunnya yield biogas yang dihasilkan. Konsentrasi buah cabai yang menghasilkan yield optimal diperoleh pada nilai konsentrasi 5 dan 8 g VS/liter untuk cabai merah dan cabai rawit secara berturut-turut. Yield tertinggi biogas dan gas metana ialahÂ 35 dan 12 ml/g VS (cabai rawit). Persentase reduksi VS relatif cukup tinggi mencapai 75%.The rising of Indonesian welfare has a positive impact towards the number of traditional market and its commodity. However, the problem of waste as a result of the market activity still not handled properly. Moreover, the waste of traditional market which remains in the landfill resulted in pollution such as groundwater contamination, green house emission and also health problems.The waste of traditional market has a big potential to be processed as biogas through anaerobic digestion method. With the presence of microorganism, this process is capable of degrading organic waste into stable organic material and biogas (methane and carbon dioxyde). One of the factor which affecting the process are the antibiotic components contained by the waste. Capsaicinoid which found in chili is the component which responsible to provide the spicy taste, has a negative effect towards the microorganism in degrading the waste into biogas. The effect of chili towards biogas production is not widely known that needs to be investigated, therefore a research needs to be conducted to determine the minimum concentration which resulted in inhibition process. The research result shows the influence of the concentration of chili (capsaicinoid) towards biogas production. Traditional market waste with 8g VS/litre which exposed to microorganism without the existence of chili reulted in higher amount of biogas than the one which mixed with chili. The bigger the concentration of chili, the bigger the inhibition. This is demonstrated by the the decreasing number of the yield of the biogas. The concentration of chili which can resulted in optimal yield production obtained at concentration value of 5 and 8 g VS/ litre for red chili and cayenne pepper respectively. The highest yield of biogas and methane are 35 and 12 ml/g VS (cayenne pepper). The VS reduction percentage is relatively high to 75%.

Komparasi Algoritma Deteksi Puncak QRS Kompleks Elektrokardiogram (EKG) Pada Pasien Penderita Stroke Iskemik Zakariyah, Muhammad; Sahroni, Alvin
Seminar Nasional Informatika Medis (SNIMed) 2019
Publisher : Magister Teknik Informatika, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Deteksi puncak QRS Kompleks sangat dibutuhkan untuk mengetahui variabilitas denyut jantung. Hal ini dikarenakan variabilitas denyut jantung merupakan parameter yang penting untuk mengetahui keadaan fisiologis seseorang. Banyak algoritma telah dikembangkan untuk mendeteksi puncak QRS Kompleks. Algoritma-algoritma yang telah ada belum pernah diujikan pada kasus stroke. Mengingat stroke juga berkaitan dengan kinerja jantung, maka penelitian ini dilakukan untuk membandingkan unjuk kerja dari ketiga algoritma deteksi puncak QRS Kompleks, yaitu Algoritma Pan-Tompkins (PT), Two Moving Average (TMA), dan Stationary Wavelet Transform (SWT) pada kasus stroke iskemik. Persentase uji sensitivitas, positif prediksi, dan akurasi dari Algoritma PT adalah 97,11%, 96,73%, dan 94,02%. Algoritma TMA sebesar 98,56%, 98,83%, dan 97,42%. Sedangkan pada Algoritma SWT adalah 93,88%, 89,54%, dan 84,60%. Algoritma PT membutuhkan waktu rata-rata eksekusi selama 2,21 detik pada frekuensi sampling 500 Hz dan 8,61 detik pada frekuensi sampling 1.000 Hertz. Algoritma TMA dan SWT berturut-turut membutuhkan waktu 3,87 detik dan 0,37 detik pada frekuensi sampling 500 Hertz, dan untuk frekuensi sampling 1.000 Hertz memerlukan waktu eksekusi selama 13,96 detik dan 1,18 detik. Berdasarkan hasil tersebut, Algoritma Two Moving Average menjadi algoritma yang paling baik diantara ketiga algoritma yang dibandingkan, meskipun memerlukan waktu yang lebih lama untuk mengeksekusi algoritmanya.

OBJECTIVE STRESS MEASUREMENT: STUDI KORELASI PARAMETER SALIVA AMYLASE DAN AKTIVITAS GELOMBANG OTAK MENGGUNAKAN ELECTROENCEPHALOGRAPH (EEG) Sahroni, Alvin; Setiawan, Hendra; Mahananto, Faizal; Zakaria, Hasballah
Transmisi: Jurnal Ilmiah Teknik Elektro Vol 22, No 1 Januari (2020): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Stres menjadi suatu permasalahan sosial yang berdampak luas, seperti ekonomi, sosial, agama, dan aspek lainnya di masyarakat. Dengan dampak tersebut, instrumen stress measurement diyakini memiliki urgensi dalam menyelesaikan permasalahan tersebut. Hingga kini, mayoritas studi pengukuran tingkat stres masih menggunakan metode personal assessment (kuesioner) yang memungkinkan terjadinya inkonsistensi dalam proses evaluasinya. Metode pengukur stres lain dengan menggunakan sampel saliva pada manusia yang diyakini mengandung hormon cortisol yang dilepaskan saat stres/manifestasinya muncul. Namun, waktu handling cukup lama dan hasil yang diperoleh tidak konsisten jika dilakukan pengukuran berulang. Penelitian ini bertujuan menginvestigasi bagian otak yang memiliki korelasi antara parameter gelombang otak menggunakan Electroencephalograph (EEG) dengan perangkat saliva amylase chip monitor sebagai salah satu upaya mengestimasi tingkat stres pada seseorang secara objektif menggunakan sampel saliva. Sepuluh orang subjek berpartisipasi dalam penelitian ini. Dengan memberikan stimulasi untuk meningkatkan tingkat stres pada seseorang menggunakan sebuah permainan komputer, respon otak menunjukkan korelasi yang kuat pada bagian frontal/otak depan terhadap hasil pengukuran saliva amylase, terutama pada aktivitas gelombang beta pada bagian F8 dengan tujuh dari sepuluh subjek memiliki nilai korelasi â‰¥ 0.7. Hal ini menunjukkan bahwa aktivitas gelombang otak pada bagian depan merupakan bagian terpenting untuk mengukur tingkat stres secara objektif menggunakan sinyal biologis secara real time.

PROTOTYPE ROBOT PENJINAK BOM TERINTEGRASI IP KAMERA DENGAN KOMUNIKASI WIRELESS BERBASIS MIKROKONTROLER ATMEGA 8535 Medilla Kusriyanto; Alvin Sahroni; Damar Anggit
Teknoin Vol. 21 No. 2 (2015)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v22i2.3703

Bomb is an object with high destructive power. Today the bomb threat in Indonesia are common. Research earlier bomb squad robot has a weakness in the design of wireless communication and video viewer. This study tries to design a prototype robot bomb disposal by using IP cameras and wireless communication using a WIZnet based microcontroller interface ATMega8535. Video is displayed with MJPEG viewer designed using Visual Basic. The movement of the robot is set using the buttons on the monitoring software that is integrated with MJPEG viewer. From the test results obtained prototype robot can move in accordance with the existing arrangements on the monitoring system by using MJPEG as robot navigation. Robots also managed to pick up objects using a gripper simulated bomb and put it into a simulated bombing. In this study used camera is a camera that is found on android phone because of limited funds. The future can use the integrated camera with IP addressing

Heart Rate Variability Analysis and The Influence of Exercise Intensity Over Time in Young-healthy Women Aisha Widi Rahayu; Izza Alifa Hassya; Eki Dipo Laksono; Alvin Sahroni
Journal of Biomedical Science and Bioengineering Vol 1, No 1 (2021)
Publisher : Center for Biomechanics, Biomaterials, Biomechantronics and Biosignal Processing (CBOIM3S)

Our heart is a vital organ that pumps blood and through the vessels of the circulatory system. In medical applications, we can observe the heart rate using Electrocardiograph (ECG). Currently, people tend to have high working activity without a proper exercise intensity. This study was conducted to observe the heart rate variability (HRV) on the healthy young woman who was not doing any exercise. We evaluated the HRV characteristics while exercising with a regular period and different intensity (light to hard) and how the difference before and after of evaluation period. Seven young-healthy women (19 - 21 years old) women were observed during three observation stages: pre-exercise, main exercise-period, and post-exercise for 2 months. We analyzed MeanRR, SDRR, CVRR, rMSSD, VLF, LF, HF, and the Poincaré plot parameters (SD1 and SD2) as the HRV properties. We found that SDRR was decreased from the first week (0.08 s) to the last week of the evaluation period (0.03 s) followed by the HF component (0.15 – 0.2 Hz). The Poincaré plot properties also reduced from the first week to the last week of the exercise period (0.07 s to 0.03 s). We indicated the characteristics of a woman's HRV during regular exercise periods with different intensity have made the heart more effective in pumping blood. We concluded that the heart condition would be improved during regular exercise with the increment of intensity even in a short of a period. Finally, the heart rate performance may be decreased during absent from regular exercise for a month.

Multiparameter Biosignal Analysis in Elderly Ischemic Stroke Patients Muhammad Zakariyah; Alvin Sahroni; Erlina Marfianti
Journal of Biomedical Science and Bioengineering Vol 1, No 1 (2021)
Publisher : Center for Biomechanics, Biomaterials, Biomechantronics and Biosignal Processing (CBOIM3S)

Biosignal can provide information about body conditions, including physiological conditions of ischemic stroke. The regulation of blood in the brain is regulated through the mechanism of Cerebral Autoregulation (CA). Some parameters that can be used to determine this mechanism are Blood Flow Velocity (BFV) and Blood Pressure (BP). Stroke is also related to nervous system activity, which is represented through the Heart Rate Variability (HRV). This study aims to determine the relationship between those biosignals and their effects on the physiology of ischemic stroke sufferers. The subjects were divided into two groups (20 strokes and 20 controls). BFV data is obtained in the Middle Cerebral Artery (MCA), BP is obtained through the arteries of the upper arms, and 3 leads electrocardiogram is placed in the chest. The results showed that there was a relationship between BP and BFV in the control group (p-value < 0.05; r = -0.574). This correlation was not found in the stroke group. The relationship between BP and HRV was only found in the stroke group, which was associated with high sympathetic activity and lower parasympathetic activity (p-values < 0.05 and r > 0.4). It was based on SDRR, RMSSD, CVRR, LF, and SD1 parameters. In the control group, there was no relationship between HRV and BP. The relationship between BFV and HRV in the control group was not found statistically. Still, in the stroke group, this relationship was found in the LF and LF/HF Ratio parameters (p-value < 0.05; r > 0.4). Based on this research, parameters on HRV that can be used to determine the characteristics of stroke patients in all positions are MeanRR, VLF, and LF

EEG band power analysis corresponding to salivary amylase activity during stressful computer gameplay Sahroni, Alvin; Mahananto, Faizal; Zakaria, Hasballah; Setiawan, Hendra
Communications in Science and Technology Vol 7 No 1 (2022)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.7.1.2022.676

The cortisol and norepinephrine from human salivary can represent psychological conditions. A portable salivary amylase monitor device (sAA) has existed; however, how the sAA corresponds to the central nervous system changes is still limited to carry out. Twenty university students aged between 20 and 22 years participated in which they played a stressful computer game during the experiment. Nineteen EEG electrodes were attached to the head scalp while the relative power on the delta, theta, alpha, and beta-band was calculated. The sAA value was obtained using a portable device called Nipro Cocorometer from Japan. The sAA levels and the brain's relative band power increased. Beta waves of the brain's right hemisphere were found higher than that of the left hemisphere, especially on the right temporal (T4, p < 0.01). Then, we concluded that the beta-band power on the right hemisphere corresponds to wthe sAA changes.

Time Segment Analysis of Heart Rate Variability to Evaluate Daily Stress using Wearable Device Technology Sahroni, Alvin; Sofyan, Pramudya Rakhmadyansyah
Jurnal ELTIKOM : Jurnal Teknik Elektro, Teknologi Informasi dan Komputer Vol. 7 No. 2 (2023)
Publisher : P3M Politeknik Negeri Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31961/eltikom.v7i2.747

Present studies have successfully evaluated psychological properties such as mental health and stress by using physiological data from the cardiovascular system. Most studies established specific interventions and ambiguous heart rate properties according to homeostatic conditions. We proposed a study evaluating mental stress based on daily activities dataset. Twenty-two healthy men were observed in this study. We employed two approaches based on the time segments, while extracting the HRV parameters. We discovered that there was no significant difference between the parameters corresponding to the daily stress score groups (low- and high-stress) when we used whole-day recording in one segment HRV parameter measurement (p > 0.05). However, by extracting the HRV parameters based on multi time segments (phases 1, 2, and 3), we found parameters that were able to properly distinguish the two groups (low- and high-stress). The frequency domain parameters are the most sensitive features, especially the LF and HF (p < 0.01), followed by the total power (p < 0.05). In the time domain measurement, the RMSSD, StdHR, SD1, and SD2 are able to differentiate the participants based on the daily stress scores (p < 0.05). As a result, this study proposed that by continually monitoring biological signals based on time segment and employing the given parameters, it is possible to appropriately and meaningfully measure the daily stress condition for future classification studies.

Analysis of Multimodal Biosignals during Surprise Conditions Correlates with Psychological Traits Setiawan, Hendra; Miladiyah, Isnatin; Nuryadi, Satyo; Sahroni, Alvin
Journal of Electronics, Electromedical Engineering, and Medical Informatics Vol 6 No 1 (2024): January
Publisher : Department of Electromedical Engineering, POLTEKKES KEMENKES SURABAYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35882/jeeemi.v6i1.346

Surprise can simultaneously represent bad or good, pleasant or unpleasant, with the same experiences since understanding how humans' physiological qualities link with their emotional or mental health is required. We conducted quantitative research to concisely correlate mental stress and emotional issues by measuring brain activity, breathing, and heart rate in real time while executing specialized audio-visual stimulation to elicit a surprise event. We evaluated the frequency and temporal domain characteristics to determine if physiological measurements matched biochemical metrics and subjective stress assessments during the elicit surprise condition experiment. We discovered that the brain is still preferable to most in recognizing a human's psychological changes over a short period of time. The temporal (T3) (r = 0.544, p = 0.005) and frontal (Fz) (r = 0.519, p = 0.008) regions were shown to correlate with salivary amylase activity. In comparison to other channels, there was a negative association between stress perception and the occipital site (O1, r = -0.618, p = 0.001). We also found that heart rate variability activity correlates with arousal perception. By looking at specific multimodal biosignals, it is possible to understand human psychological traits by recording specific physiological signals for daily mental health monitoring.

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