6 research outputs found
PENGARUH BAHAN DIELEKTRIK DALAM UNJUK KERJA WAVEGUIDE
No full textMakalah ini menyajikan hasil studi pengukuran nilai Voltage Standing Wave Ratio (VSWR) dan power reflection factor (PRF) untuk berbagai jenis bahan dielektrik yang akan disisipkan pada saluran transmisi yang beroperasi di frekuensi 9 GH dan dibandingkan dengan saluran transmisi tanpa bahan dielektrik. Pengukuran dilakukan di laboratorium antena Politeknik Negeri Padang dengan menggunakan alat ukur penunjang komponen waveguide yang berfungsi menghasilkan nilai VSWR dan PRF sehingga didapatkan grafik gelombang berdiri dengan parameter tegangan dan jarak. Pengukuran dilakukan dengan menjadikan bahan dielektrik berbagai jenis dengan kondisi rangkaian terbuka. Pengukuran pertama dilakukan untuk bahan dielektrik jenis teflon berwarna putih diperoleh hasil VSWR sebesar 28,50 dengan PRF 86,90% sedangakan bahan dielektrik jenis plexiglass berwarna transparan nilai VSWR sebesar 12,39 PRF 72,35 % dan bahan dielektrik jenis PVC berwarna abu-abu VSWR 7,97 dengan PRF 60,39 %. Sedangkan untuk saluran transmisi tanpa bahan dielektrik ( tidak disisipi bahan dielektrik ) nilai VSWR 1,50 dengan PRF 4,01%.</jats:p
Installasi Base Transceiver Station (BTS) untuk Jaringan Node B pada Operator Hutchison 3 Indonesia (H3I)
No full textBase Transceiver Station is a device used to connect mobile-phone or smartphone in order to make long-distance communication, although in doing the movement or in transit from one place to another. Installation Base Transceiver Station for Network Node B At the operator Hutchison 3 Indonesia is done to make the operator Hutchison 3 Indonesia signal received by the phone for the better and not dashed when the user performs long-distance communication links with conditions in performing the movement or in the course of one place to another. Methods beginning the process of physical installation of Base Transceiver Station for Node B network in the operator Hutchison 3 Indonesia and order all the Base Transceiver Station can live well after the battery is connected to a rectifier and the required accuracy when performing the installation Base Transceiver Station. Furthermore, the integration process or Commissioning of the Base Transceiver Station for Node B network operator Hutchison 3 Indonesia on this in order to actively and After Commissioning obtained Receive Signal Level sectoral antennas of -59 dBm which can emit a signal as far as 7 km to 8 km , after the new process or Pointing connection between this new Base Transceiver Station Base Transceiver Station with preexisting and Pointing between Siak new Base Transceiver Station Base Transceiver Station Perawang with Perawang Students who have a distance of 5 km Receive Signal level of -32.4 dBm made in accordance with a budget link provided operator Hutchison 3 Indonesia is -30 dBm to -40 dBm
TEKNIK ESTIMASI DAN KOMPENSASI GERAK PADA VIDEO CODING FGS (Fine Granularity Scalability)
No full textMotion estimation is a process to determine the movement of an object on video sequential. The movement of objects is known as motion vector. A motion vector indicates a shift point between the current frame with the reference frame. Of motion vector is obtained, it would seem that the movement of the dots between the observed frame. In this study using the algorithm block maching SAD (Sum of Absolute Different), the search process is done per pixel. To determine the quality of the movement of objects in each frame interpolation is obtained by calculating the PSNR value. PSNR values range from 35 to 40 dB. From the research conducted using the 90 frame interpolation obtained PSNR value decreases.
 
Implementasi Sistem Pengukuran Redaman Serat Optik Pada Lekukan
No full textDutch electronics company, Philips, is testing LiFi technology. LiFi or Light Fidelity is able to deliver broadband internet connections through light intermediaries. According to Philips Lightning Olivia Qiu's Chief Innovation Officer, LiFi technology has great potential for today's digital era. Indeed, if you look at the current world trend, internet connection has now become one of the daily needs of humans just like the lighting needs produced by Philips massively. When radio frequency becomes increasingly dense, the light spectrum is a large untapped resource [kompas, 2018]. Based on the facts stated that communication using optical fiber becomes very important so that to optimize the fiber optic system an implementation of optical fiber attenuation measurements is made. In this study, the method of implementing the measurement of optical fiber attenuation at a wavelength of 875 nm was introduced. This optical fiber attenuation measurement utilizes transmitter and receiver optical fiber systems that are connected to optical fibers with different lengths and curves. Attenuation for the length of 1, 3, 4, 5 and 6 meter optical fibers is 0.034, 0.558, 0.625, 1.156 and 2.170 dB respectively in straight optical fiber conditions. The power values for each optical fiber with lengths 1, 3,4,5 and 6m respectively are 52.21, 51.58, 50.81, 45.08 and 30.05 dB when there are curves. The attenuation values of each 1, 3, 4, 5 and 6 m optical fiber lengths are - 0.746, - 0.8, - 0.864, - 1,384 and - 3,145 dB respectively when there is a curve
Prevalence and long-term outcomes of patients with coronary artery ectasia presenting with acute myocardial infarction
No full textCoronary artery ectasia (CAE) is described in 5% of patients undergoing coronary angiography. Previous studies have shown controversial results regarding the prognostic impact of CAE. The prevalence and prognostic value of CAE in patients with acute myocardial infarction (AMI) remain unknown. In 4788 patients presenting with AMI referred for coronary angiography the presence of CAE (defined as dilation of a coronary segment with a diameter >= 1.5 times of the adjacent normal segment) was confirmed in 174 (3.6%) patients (age 62 + 12 years; 81% male), and was present in the culprit vessel in 79.9%. Multivessel CAE was frequent (67%). CAE patients were more frequently male, had high thrombus burden and were treated more often with thrombectomy and less often was stent implantation. Markis I was the most frequent angiographic phenotype (43%). During a median follow-up of 4 years (1-7), 1243 patients (26%) experienced a major adverse cardiovascular event (MACE): 282 (6%) died from a cardiac cause, 358 (8%) had a myocardial infarction, 945 (20%) underwent coronary revascularization and 58 (1%) presented with a stroke. Patients with CAE showed higher rates of MACE as compared to those without CAE (36.8% versus 25.6%; p <0.001). On multivariable analysis, CAE was associated with MACE (HR 1.597; 95% CI 1.238-2.060; p <0.001) after adjusting for risk factors, type of AMI and number of narrowed coronary arteries. In conclusion, the prevalence of CAE in patients presenting with AMI is relatively low but was independently associated with an increased risk of MACE at follow-up. (c) 2021 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) (Am J Cardiol 2021;156:9-15)Cardiolog
Atividade antioxidante in vitro e in vivo de diferentes cultivares de maçã (Malus domestica Borkh) do estado de Santa Catarina
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Agrárias, Programa de Pós-Graduação em Ciência dos Alimentos, Florianópolis, 2010.A maçã (Malus domestica Borkh) muito consumida em diversas regiões do mundo é considerada uma fruta rica em compostos fenólicos, os quais variam conforme a cultivar e a parte da fruta analisada. Este estudo objetivou analisar as características físico-químicas de diferentes cultivares de maçãs colhidas no sul do Brasil, nos anos de 2008 e 2009; comparar o conteúdo de compostos fenólicos e a atividade antioxidante na polpa, fruta inteira e casca destas cultivares; e investigar o efeito do consumo agudo de duas cultivares de maçã sobre a atividade antioxidante e a oxidação lipídica em humanos. Entre as duas safras, foram estudadas, no total, 22 cultivares de maçãs colhidas nas Estações Experimentais da Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (EPAGRI/SC). O conteúdo de matéria seca, sólidos solúveis totais, pH, açúcares totais, acidez titulável, fenólicos totais, flavanóis totais, antocianinas monoméricas totais e atividade antioxidante foram determinados nas amostras. Foram observadas diferenças estatisticamente significativas entre as cultivares, em todos os parâmetros de composição química analisados. As concentrações de fenólicos totais, flavanóis totais, antocianinas monoméricas totais e atividade antioxidante medida pelos métodos ABTS, DPPH e FRAP também diferiram significativamente entre as cultivares e foram maiores na casca, seguidas da fruta inteira e polpa. Independente do ano de colheita, a cultivar Catarina apresentou significativamente as maiores concentrações de fenólicos totais, flavanóis totais e maior atividade antioxidante, enquanto que a cultivar Golden Delicious, em 2008, apresentou as menores concentrações, e em 2009, esteve entre as cultivares com menores conteúdos destes parâmetros. Foi observada uma relação positiva entre o conteúdo de fenólicos totais e a atividade antioxidante dos extratos; entre flavanóis totais e atividade antioxidante; e entre fenólicos totais e flavanóis totais na polpa, fruta inteira e na casca. Nove mulheres saudáveis, não fumantes, participaram de um estudo de intervenção controlado para verificar o efeito do consumo agudo de 300 mL de suco de maçã da cultivar Golden Delicious, suco de maçã da cultivar Catarina ou Água, sobre o estado antioxidante e a oxidação lipídica sérica. Uma hora após o consumo de ambos os sucos, houve significativo aumento na capacidade antioxidante, no ácido ascórbico e ácido úrico séricos, e diminuição da oxidação lipídica comparado com o grupo controle que consumiu apenas água. Nenhuma diferença significativa foi observada entre o efeito do consumo agudo do suco da Golden Delicious e Catarina; contudo, as modificações observadas após o consumo dos sucos foram estatisticamente diferentes das observadas após o consumo de água. As concentrações séricas de fenólicos totais não foram afetadas em nenhum dos tratamentos. Nenhum efeito significante sobre a inibição da oxidação lipídica ex vivo foi observado. Após a intervenção com suco de maçã Golden Delicious e Catarina, o aumento da atividade antioxidante e à redução da oxidação lipídica sérica foram relacionados ao aumento da concentração sérica de ácido úrico. Nenhuma relação foi observada entre as alterações da concentração de ácido ascórbico e atividade antioxidante e oxidação lipídica sérica. Os resultados deste estudo indicam que o genótipo de maçãs substancialmente influencia a composição química da fruta, especialmente quanto ao conteúdo de compostos fenólicos, entretanto o efeito do consumo agudo de maçãs sobre o estado antioxidante e oxidação lipídica em humanos independe da genética desta fruta
