Lack and damage of clean water and also flooding occurred in Cimahi river basin. Water sources polluted by industry and human activities. The purpose of this study was to design the water balance model of the Cimahi watershed as a Green Watershed. The study locations were the Cimahi river, Cilember river, Cibeureum river and Cisangkan river, which flow through the city of Cimahi. The method used is the analysis of the rainfall runoff model with the hydrograph of convolution method in the four watersheds, land use analysis, runoff coefficient analysis, dilution model analysis, groundwater analysis and demographic analysis. The results of this study is Design Green Cimahi Watershed that re-functioning local drainage to maintain the hydrological storage capacity of all watersheds in the city of Cimahi, normalizing Cilember river to reach the width of the river by 5.6 m from the previous width of 1.5 m, and the river capacity which was 4.8 m3 / s to 42.37 m3 / s so that enough to accommodate Q50 flood discharge, enforcing the rule that every industry must process its waste through a waste processing plant, building Pasirkaliki retention ponds that can function for groundwater conservation, flood control and clean water needs.
Satelit nano merupakan satelit yang berukuran kecil yaitu sekitar 10x10x10 cm dengan berat kurang dari 10 kg. Satelit nano menggunakan frekuensi S-band sebagai frekuensi kerjanya yakni 2,4 GHz. Satelit ini mampu mengorbit pada orbit LEO. Pada jarak orbit LEO yang sangat jauh ditambah dengan gangguan lain menyebabkan daya sinyal pengiriman menjadi sangat lemah, maka dibutuhkan penguat pada stasiun bumi agar level daya menjadi stabil seperti daya yang dikirimkan dari nano satelit. Penelitian ini merancang sebuah Low Noise Amplfier (LNA) pada frekuensi 2,4 GHz dengan penguatan 30 dB dan noise figure ≤ 2 dB. Penguat ini dirancang dengan dua tingkat menggunakan lumped elemen dengan komponen aktif penyusunnya adalah jenis transistor e-pHEMT yaitu ATF 34143, secara simulasi menggunakan software ADS. Pada penelitian ini menghasikan perancangan penguatan maksimum sekitar 30,82 dB; S11=-27,27 dB; S22=-33,9 dB; VSWR1=1,091; VSWR2=1,04; NF=0,481; K=3,387.
Flood early warning systems are used for flood disaster preparedness to reduce disaster risks. The problem is damage of water level sensor due to aggradation which also results in river capacity reduced. The purpose of this research is to determine the effect of river basin morphology change on threshold parameters in flood early warning system. Measured hydraulic parameters are flow depth, flow velocity, and riverbed slope. Land cover was conducted using Cimahi river basin land use map to determine runoff coefficient. Rainfall-runoff model used is the Deconvolution Software program to determine unit hydrographs. Results of this study indicate that morphological changes of watershed significantly influence threshold parameters. A 0.5 m rise in river bed can reduce river capacity by 41.8% and narrowing of 16 m-wide river border dropped river capacity from 730 m3/s to 95.2 m3/s. An increase of 17 % runoff coefficient, increased direct runoff by 17%. Reducing this river capacity makes threshold parameters in flood early warning system invalid causing flood events cannot be detected earlier by the system.
Flood management requires an assessment of flood levels that occur appropriately. Determining flood levels quantitatively can help control floods more efficiently. This study aims to make flood quantification based on the inundation indicators and scale of risk. The case study is in Citarik, Cilember, Cimahi, Cisangkan, and Cibeureum, located in the Citarum watershed, West Java, Indonesia. The method used is a mathematical model of flow verified by the river's physical dimensions. Four indicators were analyzed based on unsteady one-dimensional river flow and overland flow models. The four flood quantity indicators with different weights are namely percentage of inundation area (Ai), percentage of area activity on the inundation area (Aac), inundation duration (D), and inundation depth (H) which have consecutive indexes 0.3, 0.2, 0.2 and 0.3. The initial discharge was analyzed based on unit hydrograph at the upstream river cross-section of the inundation region. The study's results by verification of field observations showed that the highest peak inundation was 3.0 m in Cilember, inundation duration was a maximum of 18 hours in Citarik and Cilember, the highest inundation area was 329.23 % of the watershed area of Cilember. Results of calculations with the formulations, the highest quantity is 16.18 in Cilember flood that occurs in Melong village with a risk scale of 5. These results conclude that the Cilember flood is high-level damage so that it is a priority to be overcome.
Keamanan pada server data diperlukan untuk mengamankan semua data yang dimiliki oleh suatu instansi. Pengembangan akses keamanan ke ruang server juga perlu ditingkatkan untuk melindungi semua data yang dimiliki oleh instansi tersebut. Pada penelitian ini, peneliti merancang suatu alat keamanan dimana pengguna yang mengakses ke ruang server harus melewati sistem keamanan doorlock yang berbasis IoT (Internet of Things). Sistem keamanan doorlock ini menggunakan teknologi RFID yang selanjutnya data yang diakses diproses oleh raspberry untuk mengirimkan data pengakses ke web server. Hasil perancangan sistem keamanan server akses doorlock ke ruang server dengan teknologi RFID berbasis IoT pada proyek NEW UNJANI pada jarak maksimal 2 cm antara RFID tag dengan RFID dengan tingkat keberhasilan pembacaan RFID reader ke RFID tag 100%. Pengujian selanjutnya RFID tag diberikan media lain, yaitu dompet dan cover card yang pengujiannya mendapatkan persentasi keberhasilan 100%. Dengan hasil tersebut, peneliti kembali menguji 3 buah RFID tag yang memiliki jenis berbeda. Setiap RFID tag dilakukan pengujian 50 kali, sehingga total dilakukan pengujian sebanyak 150 kali. Untuk pengujian RFID tag pertama mendapatkan persentasi kegagalan sebesar 26%. Untuk pengujian RFID tag kedua mendapatkan persentasi kegagalan sebesar 20%. Untuk pengujian RFID tag ketiga mendapatkan persentasi keberhasilan sebesar 100%.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.