scholarly journals ANALISIS PERFORMANCE SERAT OPTIK SEBAGAI MEDIA TRANSMISI PADA JALUR TRANSMISI LUBUK BASUNG–LUBUK SIKAPING

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Riri Yulianti Solfia ◽  
Putra Jaya ◽  
Yasdinul Huda
Keyword(s):  
Optical Fiber ◽  
Key Words ◽  
Measured Data ◽  
Threshold Sensitivity ◽  
Maximum Value ◽  
Measurement Results ◽  
Link Budget ◽  
Attenuation Values ◽  
Instrument Sensitivity

This study aims to investigate the performance of optical fiber as a transmission medium. This was conducted using the discrepancy modle, which made the comparison between the measured data with the standard used PT.Telkom and ITU-T. Object of this research is the value of attenuation and power link budget. Based on the measured data on each core is core 3,7,9,10,12,15,18,20, and 23 obtained the following values as 0.239 dB / km, 0.238 dB / km, 0.240 dB / km, 0.239 dB / km , 0.236 dB / km, 0.240 dB / km, 0.242 dB / km, 0.233 dB / km, 0.238 dB / km, and the results of calculations on the same cores with each core attenuation is 0.235 dB / km, 0.235 dB / km, 0.235 dB / km, 0.235 dB / km, 0.235 dB / km, 0.235 dB / km, 0.237  dB  /  km,  0.235  dB  /  km,  0.235  dB  /  km,  based  on  the  results  of  calculation, measurement and compared with standard attenuation values are in compliance with standards ITU-T and PT.Telkom because it does not exceed the maximum attenuation is 0.25 dB/km. Analysis performed with comparing the power in receive (Rx) between the results of the calculation of each core with measurement results and instrument sensitivity, but the overall results  of  the  calculation  and  measurement  is  still  at  the  maximum  value  of  threshold sensitivity system is -19 dBm. Key   words :  Core,   Performance,   Attenuation,   Power   Link   Budget,   Rx   Levell

scholarly journals Measurements of Rotational Events Generated by Artificial Explosions and External Excitations Using the Optical Fiber Sensors Network

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6107
Author(s):  
Anna T. Kurzych ◽  
Leszek R. Jaroszewicz ◽  
Michał Dudek ◽  
Jerzy K. Kowalski ◽  
Felix Bernauer ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Performance Test ◽  
Rotational Velocity ◽  
Target Object ◽  
Fiber Sensors ◽  
Full Field ◽  
Rotational Seismology ◽  
Full Field Measurement ◽  
Measurement Results ◽  
Sensor Properties

Measurements of artificial events can substantially confirm the data validity of constructed rotational sensors, as well as provide methods for simplifying the measurement process. The above task, especially with international cooperation, can provide full-field measurement results of the target object, which can deliver more significant data and sensor properties. The paper presents vertical rotational velocity recordings gathered during an international experiment that took place at the Geophysical Observatory of the Ludwig Maximilian University of Munich in Fürstenfeldbruck, Germany. Data were obtained during artificial explosions, as well as external excitations induced by a VibroSeis truck. The authors present data recorded by two prototypes of optical fiber rotational sensors. They have been specially designed for rotational seismology needs and are characterized by a theoretical sensitivity equal to 2 × 10−8 rad/s/√Hz and a wide measuring range both in amplitude even up to 10 rad/s, and a frequency from DC to 1000 Hz. Their self-noise investigation during the aforementioned experiment showed that both sensors have precision no worse than 2 × 10−6 rad/s/sqrt (Hz) in all desired frequency range from 0.01 to 100 Hz. A down-sampling and a spectral analysis of the recorded signals are also presented. The recorded data and their analysis confirmed the performance and reliability of the applied optical fiber rotational sensors. Moreover, the presented international experiment underlines a special necessity for specifying the sensors’ performance test methodologies in the rotational seismology.

scholarly journals An Efficient Full-Wave Electromagnetic Analysis for Capacitive Body-Coupled Communication

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Muhammad Irfan Kazim ◽  
Muhammad Imran Kazim ◽  
J. Jacob Wikner
Keyword(s):  
Human Body ◽  
Ground Plane ◽  
Propagation Loss ◽  
Communication Link ◽  
Simulation Approach ◽  
Full Wave ◽  
The Earth ◽  
Measurement Results ◽  
Link Budget ◽  
Physiological Variations

Measured propagation loss for capacitive body-coupled communication (BCC) channel (1 MHz to 60 MHz) is limitedly available in the literature for distances longer than 50 cm. This is either because of experimental complexity to isolate the earth-ground or design complexity in realizing a reliable communication link to assess the performance limitations of capacitive BCC channel. Therefore, an alternate efficient full-wave electromagnetic (EM) simulation approach is presented to realistically analyze capacitive BCC, that is, the interaction of capacitive coupler, the human body, and the environment all together. The presented simulation approach is first evaluated for numerical/human body variation uncertainties and then validated with measurement results from literature, followed by the analysis of capacitive BCC channel for twenty different scenarios. The simulation results show that the vertical coupler configuration is less susceptible to physiological variations of underlying tissues compared to the horizontal coupler configuration. The propagation loss is less for arm positions when they are not touching the torso region irrespective of the communication distance. The propagation loss has also been explained for complex scenarios formed by the ground-plane and the material structures (metals or dielectrics) with the human body. The estimated propagation loss has been used to investigate the link-budget requirement for designing capacitive BCC system in CMOS sub-micron technologies.

HIGHLY ACCURATE WAVELENGTH SCANNED FOUR-WAVE MIXING EXPERIMENT IN AN OPTICAL FIBER AND DEMONSTRATION OF RETRIEVAL OF ITS LINEAR AND NONLINEAR OPTICAL PARAMETERS

2006 ◽  
Vol 15 (01) ◽  
pp. 141-156
Author(s):  
S. J. JUNG ◽  
J. Y. LEE ◽  
D. Y. KIM
Keyword(s):  
Optical Fiber ◽  
Nonlinear Optical ◽  
Chromatic Dispersion ◽  
Tunable Laser ◽  
Four Wave Mixing ◽  
Optical Parameters ◽  
Wave Mixing ◽  
Dependent Change ◽  
Measurement Results ◽  
Linear And Nonlinear

Accurate wavelength scanned four-wave mixing (FWM) measurement results in an optical fiber are presented with two tunable laser sources near the dispersion-zero wavelength of the fiber. By comparing the measured FWM data with a simple analytic expression, we have demonstrated that important linear and nonlinear optical properties such as zero-dispersion wavelength, dispersion slope and nonlinear refractive index of the sample fiber. Highly accurate and repeatable measurement results for a sample fiber are presented. Temperature-dependent change in the chromatic dispersion of a fiber is also investigated.

Characteristics of the flow field in the combustion chamber of the internal combustion test engine

2011 ◽  
Vol 32 (3) ◽  
pp. 203-214 ◽  
Author(s):  
Wojciech Tutak ◽  
Arkadiusz Jamrozik
Keyword(s):  
Flow Field ◽  
Combustion Chamber ◽  
Flow Velocity ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Maximal Velocity ◽  
Maximum Value ◽  
Measurement Results ◽  
Test Engine ◽  
Fresh Charge

Characteristics of the flow field in the combustion chamber of the internal combustion test engine Results of a research study into the velocity field in combustion chamber of internal combustion engine are presented in the paper. Measurements of fresh charge flow velocity in the cylinder axis and near the cylinder squeezing surface were performed. The hot-wire anemometer was used. The measurement results were used for analysis of turbulence field in the examined combustion chamber. It turned out that in the axis of cylinder the maximum of velocity occurs 30 deg before TDC and achieves 6 m/s. In the studied combustion chamber, the maximum value of turbulence intensity was close to 0.2 and it was achieved 35 deg BTDC. Additionally, the maximal velocity dispersion in the following cycles of the researched engine was at the level of 2 m/s, which is 35% of the maximum value of flow velocity. At a point located near the squeezing surface of the piston, a similar level of turbulence, but a the smaller value of the average velocity was achieved. The turbulence field turned out to be inhomogeneous in the combustion chamber.

scholarly journals Analisis Performance Jaringan 2G Global System For MobileComunication (GSM) Frekuensi 900 MHz dan 1800 MHz Berdasrkan Data Drive Test di PT. Telkomsel Padang

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Kenny Pratama Putra ◽  
Delsina Faiza ◽  
Yasdinul Huda
Keyword(s):  
Data Analysis ◽  
Calculation Method ◽  
Poor Quality ◽  
Base Stations ◽  
Power Budget ◽  
Global System ◽  
Phone Calls ◽  
Measurement Results ◽  
Link Budget ◽  
Gsm Network

This research was motivated by a decline in performance on the BTS Batang Marau, which indicates the level of Rx Level, Rx Qual and SQI not meet KPI targets, so the presence of the area around the base stations that do not meet the standard Rx Level to make phone calls (blankspot). The purpose of this study was to determine the performance of GSM 900 and 1800 networks, as well as to improve the performance of base stations Batang Marau Power Link Budget calculation method. This study discusses the improving performance of GSM network at the site decreased performance, where performance is observed through measurement results based on the data drive test. The results of data analysis showed : (1) From the analysis, GSM 1800 already meet KPI targets for Rx Level >95 %, Rx Qual >94 % and SQI >93 %. In GSM 900 results analysis and Rx Qual SQI already meet the target KPI Rx Qual  >94 % and SQI >93 %, while the results of the analysis of Rx level at 09.00 already reached the target KPI >95 %, at 15:00 and 20:00, still has not reached the target KPI <95 %, which indicates the time of measurement using tools Tems Investigation, there are several areas that Rx the level of poor quality. (2) Value Rx level in the area around the base stations are <-95 dBm indicates blankspot area (can lead to a drop call). (3) The estimated increase in performance on the GSM network by the method of link power budget on the BTS Batang Marau  shows 69.3 dBm Rx Level (Good quality) at a distance of 2.5 km, so it can be concluded that the performance of GSM 900 base stations have been increased Batang Marau performances.

scholarly journals Pengaruh Cerita Moral Terhadap Perilaku Prososial Anak

2013 ◽  
Vol 2 (1) ◽  
Author(s):  
Katarina K.Tanaya
Keyword(s):  
Prosocial Behavior ◽  
Key Words ◽  
T Test ◽  
Control Group ◽  
Moral Value ◽  
City Life ◽  
Measurement Results ◽  
The Mean ◽  
Experimental Group

Abstract, Harsh city life fosters behaviors harm others. Moral-value can internalized through a moral story that will encourage children to behave in prosocial manner. Sixteen moral story of sharing, cooperation, helpfulness, and act honestly given to the experimental group children twice a week. At week eight measured prosocial behavior. The measurement results were analyzed by t-test showed t = 18,149 (p < 0,01). The analysis showed the mean of prosocial behavior on experimental group (mean = 162,12) was significantly greater than control group (mean = 96,18). Key words: Moral story, prosocial behavior

scholarly journals Underground Radio Propagation on Frequency Band 97 Mhz – 130 Mhz

2018 ◽  
Vol 7 (3.2) ◽  
pp. 722 ◽  
Author(s):  
S Suherman ◽  
Ali Hanafiah Rambe ◽  
Agustiar Widodo Tanjung
Keyword(s):  
Frequency Band ◽  
Radio Propagation ◽  
Future Application ◽  
Propagation Characteristics ◽  
Radio Communications ◽  
Earthquake Detection ◽  
Measurement Results ◽  
Link Budget ◽  
Underground Radio ◽  
Propagation Measurement

Radio communications do not work only in the air and underwater, but also underground. Some applications such as mining and earthquake detection require underground radio devices. This paper reports an assessment of underground radio characteristics for frequency band 97 MHz to 130 MHz. The assessments were performed through an experimental propagation measurement and a mathematical prediction. Both assessments then are compared by using the normalized graph to predict propagation characteristics so that correct link budget for future application can be assisted. The mathematic analysis and measurement results still produce huge errors; achieving 50.33% for frequency 130.762 MHz, 17.58% for 109.818 MHz and 13.38% for 97.335 MHz. Error can be minimized when the ground permittivity is more precise  

Design and Linear Fitting of High Sensitive Optical Power Meter

2010 ◽  
Vol 171-172 ◽  
pp. 429-432
Author(s):  
Wen Jia Lu ◽  
Yi Wei ◽  
Yi Fan Zhao
Keyword(s):  
Dynamic Range ◽  
Optical Power ◽  
High Sensitivity ◽  
Measured Data ◽  
Construction Monitoring ◽  
Linear Fitting ◽  
Power Meter ◽  
Standard Data ◽  
Measurement Results ◽  
Multi Wavelength

This paper introduces the hardware design of digital optical power meters and the algorithm flow.The power meter detector, with InGaAs-PIN photodiode and LTC6078,is used as a preamplifier for the measurement of micro-current;Silicon Laps C8051f410 are selected as the micro-controller for AD quantification and data processing, and the linear fitting of the measured data and standard data is completed in Matlab environment.After the comparison between the two measurement results,the proposed optical power meter adopts certain algorithm to compensate the deviation and improve the overall performance.The analyses of measured data show that:the optical power meter can be designed to precisely measure multi-wavelength with wide dynamic range and high sensitivity,support AC and DC dual power supply,and be portable.Therefore It also can be used both by university laboratories for teaching and by government department for construction monitoring and optical communications maintenance.

An Analysis on Electrical Conduction Spatial Characteristics in Saline-Alkali Soil

2012 ◽  
Vol 466-467 ◽  
pp. 70-74
Author(s):  
Xing Ming Zheng ◽  
Kai Zhao ◽  
Ling Jia Gu
Keyword(s):  
Spatial Variation ◽  
Electrical Conduction ◽  
Measured Data ◽  
Point Of View ◽  
Spatial Period ◽  
Correlation Relation ◽  
Alkali Soil ◽  
Measurement Results ◽  
The Mean ◽  
Autocorrelation Length

This paper mainly analyzes the spatial distribution of electrical conduction (EC) in the five study areas using the measured data by EM38. The analysis on electrical conduction spatial variation is conducive to correctly understand the electrical conduction measurement results in saline-alkali soil. Based on the analysis of sampled electrical conduction data, the following conclusions are obtained. First, the spatial variation of electrical conduction is related to its mean. From a macro point of view, the greater the mean of electrical conduction is, the stronger spatial heterogeneity will be. This relationship may not be met when two study areas have the similar mean of electrical conduction. Second, the spatial autocorrelation length of electrical conduction distribution is the description of the spatial correlation relation changes with distance, while the sill of electrical conduction indicates the amplitude of electrical conduction spatial variation. Finally, the discrete Fourier transform results show that electrical conduction has different spatial period in the five study areas.

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