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All Journal Agrikultura ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Sains Teh dan Kina Creative Research Journal International Journal of Renewable Energy Development Annales Bogorienses
Erdiansyah Rezamela, Erdiansyah
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Other

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The influence of El-Nino on microclimate change and soil water content in Gambung tea plantation Rezamela, Erdiansyah; Dalimoenthe, Salwa Lubnan
Jurnal Penelitian Teh dan Kina Vol 19, No 1 (2016)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (329.227 KB) | DOI: 10.22302/pptk.jur.jptk.v19i1.63

Abstract

The very strong intensity of 2015 El-Nino affected on microclimate change and soil water content of Gambung Tea Plantation. The observation results indicated that in the year of 2015 Gambung was experienced four dry months (with rainfall <60 mm), with maximum air temperature 30,8ºC and air humidity dropped to 65%. These condition were not suitable for tea plant to grow well, which normally required two dry months at minimum (rainfall < 60 mm), air temperature of 18–25ºC, and with relative humidity of above 70%. The affected areas by drought were present in a map (see Figure 3 of the text). About 65% of the total blocks (north section about 80% and south section about 50%) of Gambung tea plantation were affected by drought. The worst affected were blocks A6 (north section) and B8 (south section). In these blocks, about 54.70% of plant were in normal growth condition; 14.65% were in temporary and permanent wilting status; 25.34% in the state of dropping their leaves; 5.19% of the plants with dried buds twigs, and 0.12% with dried twigs and dried old branches. The soil water content (at 10 cm depth) in these blocks dropped to 7.02% and 4.99% from normally required at minimum 30%.
The effect of drought period on attack intensity of Empoasca sp and blister blight in Gambung tea plantation Rezamela, Erdiansyah; Fauziah, Fani; Dalimoenthe, Salwa Lubnan
Jurnal Penelitian Teh dan Kina Vol 19, No 2 (2016)
Publisher : Research Institute for Tea and Cinchona

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (388.812 KB) | DOI: 10.22302/pptk.jur.jptk.v19i2.111

Abstract

El-Nino had a significant impact on micro climate change including in rainfall, temperature and air humidity in Gambung Tea Plantation. In the dry season 2015, Gambung experienced four dry months that affect attack intensity of Empoasca and disease intensity of Blister Blight. This study aimed to determine the relationship between micro climate parameters and attack intensity of Empoasca and disease intensity of Blister Bright. Micro climate observation data were taken from Davis Automatic Weather Station (AWS) including rainfall intensity (mm), relative humidity (%) and maxium air temperature (0C). Attack intensity of Empoasca sp and Blister Bligh were observed by counting the number of healthy P+3 shoots as well as infected shoot from 200-500 gram of wet shoot sample randomly taken from container net at the plucking time. The results showed that the intensity of Empoasca decreased from 16.49% to 12.90% in the dry months from July to October 2015. The disease intensity of Blister Blight only occurred in July. There was a polynomial relationship among rainfall, temperature and humidity to the attack intensity of Empoasca with R2 values of 0.71, 0.77, 0.87, respectively the decrease of attack intensity occurred at ranfall intensity >140 mm, temperature >28°C and humidity >80%. Meanwhile linear relationship occurred among rainfall, temperature and humidity to the disease intensity of Blister Blight with R2 values of 0,98; 0,64; and 0,77, respectively the increasing of rainfall and humidity caused the increasing of disease intensity of Blister Blight. However disease intensity of Blister Blight decreased with increase in ambient temperature.
PENGARUH APLIKASI PUPUK DAUN MINERAL DAN ORGANIK CAIR TERHADAP PENINGKATAN PERTUMBUHAN BENIH TEH SIAP SALUR Wulansari, Restu; Rachmiati, Yati; Rezamela, Erdiansyah
Creative Research Journal Vol 2, No 02 (2016)
Publisher : Badan Penelitian dan Pengembangan Daerah (BP2D) Provinsi Jawa Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1253.5 KB)

Abstract

Persemaian teh merupakan tahapan penting untuk mendapatkan benih teh berkualitas. Permasalahan yang pada penyediaan benih berkualitas adalah persentase benih siap salur rendah. Penelitian ini bertujuan untuk meningkatkan persentase benih siap salur melalui pemberian pupuk mineral dan pupuk organik di persemaian teh. Penelitian dilaksanakan di Persemaian Pusat Penelitian Teh dan Kina, Bandung, Jawa Barat Rancangan penelitian yang digunakan adalah Rancangan Acak Kelompok, dengan empat perlakuan dan enam ulangan. Benih yang digunakan adalah klon GMB 7 berumur bibit 8,5 bulan. Perlakuan terdiri dari: pupuk mineral berupa larutan urea 2%, serta 2,5 mL/L, 5 mL/L dan 7,5 mL/L pupuk organik. Hasil penelitian menunjukkan bahwa pertumbuhan bibit teh yang diberi pupuk mineral dengan nyata lebih cepat dibandingkan dengan pupuk organik. Persentase bibit siap salur berumur 13,5 bulan tinggi pada pembibitan dengan pupuk mineral urea, yaitu 53,26%. Penelitian ini menjelaskan bahwa penggunaan larutan urea di persemaian teh memberikan pertumbuhan benih siap salur lebih cepat.
PENGARUH APLIKASI PUPUK DAUN MINERAL DAN ORGANIK CAIR TERHADAP PENINGKATAN PERTUMBUHAN BENIH TEH SIAP SALUR Wulansari, Restu; Rachmiati, Yati; Rezamela, Erdiansyah
CREATIVE RESEARCH JOURNAL Vol 2 No 02 (2016): Creative Research Journal
Publisher : Badan Penelitian dan Pengembangan Daerah Provinsi Jawa Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34147/crj.v2i02.18

Abstract

Persemaian teh merupakan tahapan penting untuk mendapatkan benih teh berkualitas. Permasalahan yang pada penyediaan benih berkualitas adalah persentase benih siap salur rendah. Penelitian ini bertujuan untuk meningkatkan persentase benih siap salur melalui pemberian pupuk mineral dan pupuk organik di persemaian teh. Penelitian dilaksanakan di Persemaian Pusat Penelitian Teh dan Kina, Bandung, Jawa Barat Rancangan penelitian yang digunakan adalah Rancangan Acak Kelompok, dengan empat perlakuan dan enam ulangan. Benih yang digunakan adalah klon GMB 7 berumur bibit 8,5 bulan. Perlakuan terdiri dari: pupuk mineral berupa larutan urea 2%, serta 2,5 mL/L, 5 mL/L dan 7,5 mL/L pupuk organik. Hasil penelitian menunjukkan bahwa pertumbuhan bibit teh yang diberi pupuk mineral dengan nyata lebih cepat dibandingkan dengan pupuk organik. Persentase bibit siap salur berumur 13,5 bulan tinggi pada pembibitan dengan pupuk mineral urea, yaitu 53,26%. Penelitian ini menjelaskan bahwa penggunaan larutan urea di persemaian teh memberikan pertumbuhan benih siap salur lebih cepat.
Keefektifan Penggunaan Pupuk Anorganik dan Aplikasi Kitosan dalam Meningkatkan Pertumbuhan dan Hasil Tanaman Teh (Camellia sinensis L.) Rachman, Annisa Lugina; Anjarsari, Intan Ratna Dewi; Soleh, Mochamad Arief; Rezamela, Erdiansyah
Agrikultura Vol 35, No 1 (2024): April, 2024
Publisher : Fakultas Pertanian Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/agrikultura.v35i1.53754

Abstract

Selama lima tahun terakhir, produktivitas teh di Indonesia cenderung fluktuatif dengan tren meningkat. Salah satu langkah untuk meningkatkan produktivitas tanaman teh adalah melalui pemupukan.  Aplikasi pupuk anorganik dilakukan untuk meningkatkan pertumbuhan dan perkembangan tanaman the. Kitosan merupakan senyawa organik turunan kitin yang berasal dari limbah atau cangkang kepiting dan udang dimana salah satu peran dari  kitosan dapat meningkatkan kandungan klorofil sehingga diharapkan aktivitas fotosintesis tanaman  teh lebih efektif Pemberian pupuk anorganik N, P, K dan kitosan diharapkan dapat meningkatkan pertumbuhan dan perkembangan pucuk teh sehingga terjadi peningkatan produktivitas. Penelitian ini bertujuan untuk mengetahui respons morfologis, dan fisiologis tanaman teh menghasilkan klon GMB 7 serta menentukan kombinasi dosis pupuk anorganik dan bahan organik cair yang mengandung kitosan. Percobaan dilaksanakan pada bulan Juni 2023 sampai dengan September 2023  di Kebun Percobaan Pusat Penelitian Teh dan Kina (PPTK) Gambung, Jawa Barat dengan ketinggian tempat 1.250 m dpl. Tanaman yang digunakan adalah tanaman teh menghasilkan (TM) klon GMB 7 umur  tujuh  tahun. Penelitian menggunakan Rancangan Acak Kelompok dan dilanjutkan dengan uji jarak berganda Duncan. Percobaan terdiri dari sembilan perlakuan kombinasi pupuk anorganik dan kitosan  dan diulang sebanyak empat kali. Hasil penelitian menunjukkan bahwa kombinasi pemberian pupuk anorganik N, P, K dan bahan organik cair kitosan pada tanaman teh menghasilkan klon GMB 7, berpengaruh  terhadap pertumuhan dan hasil  meliputi indeks klorofil daun dan nilai konduktansi stomata dan bobot segar pucuk, namun tidak berbeda nyata terhadap bobot kering pucuk dan rendemen pucuk. Perlakuan yang diberikan memberikan hasil yang berbeda-beda di setiap pengamatannya pada parameter jumlah peko, jumlah burung dan rasio peko-burung. Kombinasi pemberian 75% pupuk anorganik dan 30 ml/l bahan organik cair kitosan memberikan pengaruh yang paling baik terhadap bobot  pucuk segar tanaman teh klon GMB 7. Kombinasi ini juga memberikan pengaruh yang terbaik pada respons jumlah pucuk peko, jumlah pucuk burung, indeks klorofil daun dan nilai konduktansi stomata.
Response Speed Analysis of Interactive Voicebot Receptionist UDZRI, MUHAMMAD HAFIDZ; YAKIN, NIZAR AINUL; HASNAH, FIDA YUZIDA; DARLIS, DENNY; REZAMELA, ERDIANSYAH; FITRI, IFTITA; FAUZI A, FARIS NUR; SUNARYA, UNANG
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 12, No 4: Published October 2024
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v12i4.983

Abstract

ABSTRAKPusat Penelitian Teh dan Kina (PPTK) Gambung menghadapi tantangan dalam memberikan informasi cepat kepada pengunjung. Untuk mengatasinya, dikembangkan voicebot interaktif berbasis teknologi Python Speech Recognition dan Pyttsx3, yang menggunakan metode speech-to-text dan text-to-speech. Pengujian dilakukan dengan variasi kondisi internet, intensitas kebisingan, perbedaan aksen, dan analisis keluaran suara. Hasil menunjukkan akurasi hingga 90% dengan rata-rata kecepatan tanggap 1,94 detik pada koneksi internet stabil dan suara yang jelas. Di lingkungan bising dengan kekuatan suara tinggi (105 dB), voicebot tetap mampu menanggapi. Voicebot ini juga menunjukkan akurasi yang sama (90%) untuk penutur asli dan non-asli bahasa Inggris. Solusi ini berpotensi meningkatkan aksesibilitas informasi di PPTK Gambung, meskipun kinerjanya dipengaruhi oleh kestabilan internet dan kondisi lingkungan.Kata kunci: voicebot, voice-to-text, text-to-speech, pyttsx3, speech recognition ABSTRACTThe Gambung Tea and Cinchona Research Center (PPTK) faces challenges in providing timely information to visitors. To address this, an interactive voicebot based on Python Speech Recognition technology and Pyttsx3 was developed, utilizing speech-to-text and text-to-speech methods. Tests were conducted with variations in internet conditions, noise intensity, accent differences, and voice output analysis. Results show accuracy of up to 90% with an average response speed of 1,94 seconds on a stable internet connection and clear voice. In noisy environments with high voice strength (105 dB), the voicebot was still able to respond. The voicebot also showed similar accuracy (90%) for native and nonnative English speakers. This solution has the potential to improve information accessibility at PPTK Gambung, although its performance is affected by internet stability and environmental conditions.Keywords: voicebot, voice-to-text, text-to-speech, pyttsx3, speech recognition
Bio-briquettes from tea fluff biochar: a response surface methodology study on particle size, resin gum-adhesive, and used cooking oil immersion time Suryajaya, Suryajaya; Agustian, Egi; Haryanti, Ninis Hadi; Prasetia, Hafiizh; Rahmah, Siti; Kurniawan, Hendris Hendarsyah; Wianto, Totok; Ramadhoni, Benni F; Manik, Tetti Novalina; Annisa, Nova; Rezamela, Erdiansyah; Sulaswatty, Anny
International Journal of Renewable Energy Development Vol 14, No 5 (2025): September 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60877

Abstract

Fluff tea is the residual solid waste generated in the green tea industry and holds the potential for development as a solid fuel in bio-briquettes. This study transformed fluff tea into bio-briquettes utilizing biochar produced through slow pyrolysis. The study aimed to optimize bio-briquettes production from fluff tea using the Response Surface Methodology (RSM) approach through proximate analysis. The cylindrical bio-briquettes were produced using biochar particle sizes of 850, 500, and 150 μm, resin gum adhesive concentrations of 10%, 15%, and 20%, and immersion times in cooking oil of 0, 3, and 6 minutes. The results showed that the overall response by the p-value was <0.05, and the lack of fit was insignificant (p-value >0.05). The findings indicated that the calorific value of tea fluff rose from 4,482.56 cal/g to 6,374.98 cal/g after conversion to biochar. The optimum conditions for producing tea fluff bio-briquettes were a particle size of 850 μm, adhesive concentration of 11%, and immersion time of 5 minutes. The bio-briquettes exhibited a moisture content of 3.53%, ash content of 5.65%, volatile matter of 14.75%, fixed carbon of 76.14%, calorific value of 7,796.37 cal/g, combustion rate of 0.11 g/min, density of 1.22 g/cm3, and compressive strength of 35.57 N/cm2. Most tea fluff briquettes' properties had met Indonesia's briquettes standard. The production of bio-briquettes from tea fluff waste is a viable alternative fuel for both industrial and domestic applications.
Catechin Contents, Antioxidant, and Antibacterial Activities of Different Types of Indonesian Tea (Camellia sinensis) Nuryana, Isa; Ratnakomala, Shanti; Fahrurrozi, Fahrurrozi; Juanssilfero, Ario Betha; Andriani, Ade; Putra, Filemon Jalu Nusantara; Rezamela, Erdiansyah; Wulansari, Restu; Prawira-Atmaja, M. Iqbal; Lisdiyanti, Puspita
Annales Bogorienses Vol. 24 No. 2 (2020): Annales Bogorienses
Publisher : BRIN

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

Abstract

Tea is one of the most popular beverages in the world. Produced from Camellia sinensis leaves, tea has been studied to provide health benefits due to the content of important metabolites. This study aimed to investigate the catechin contents, antioxidant, and antibacterial activities of Indonesian tea varieties, namely green tea, black tea, and white tea. Tea infusion was prepared by extracting 1 g of each sample into 10 mL of distilled water and incubated at 80 °C for 60 min. The catechin and epigallocatechin gallate (EGCG) contents of tea extracts were determined using high-performance liquid chromatography (HPLC). Antioxidant activity was measured using the free radical method with 2,2-diphenyl-1-pycrylhidrazyl (DPPH), while antimicrobial activity was assesed using paper disc diffusion assay. The results indicated that green tea had the highest contents of catechin (646 ± 17.14 mg/L) and EGCG (997.8 ± 36.72 mg/L), and antioxidant activity with IC50 of 5.65 µg/mL. Furthermore, green tea and white tea extracts showed inhibitory activity against Gram-positive bacteria such as Micrococcus luteus, Bacillus subtilis, and Staphylococcus aureus whereas black tea had no activity against all bacterial strains tested. Generally, we concluded that white tea and green tea contributed to the higher content of catechins and exhibited strong antioxidant and antibacterial properties.
Co-Authors ADE ANDRIANI Anny Sulaswatty, Anny Ario Betha Juanssilfero Denny Darlis Egi Agustian Fahrurrozi Fahrurrozi Fani Fauziah, Fani FAUZI A, FARIS NUR FITRI, IFTITA Hafiizh Prasetia, Hafiizh HASNAH, FIDA YUZIDA Hendris Hendarsyah Kurniawan, Hendris Hendarsyah Intan Ratna Dewi Anjarsari M. Iqbal Prawira-Atmaja, M. Iqbal Manik, Tetti Novalina Mochamad Arief Soleh, Mochamad Arief Ninis Hadi Haryanti, Ninis Hadi Nova Annisa, Nova Nuryana, Isa PUSPITA LISDIYANTI Putra, Filemon Jalu Nusantara Rachman, Annisa Lugina Ramadhoni, Benni F Restu Wulansari, Restu Salwa Lubnan Dalimoenthe, Salwa Lubnan Sembiring, Rinawati SHANTI RATNAKOMALA Suryajaya Suryajaya, Suryajaya Totok Wianto UDZRI, MUHAMMAD HAFIDZ Unang Sunarya YAKIN, NIZAR AINUL Yati Rachmiati, Yati