There are many mango cultivars available in different regions.It is about time we analysed their productive behavior these areas, as well phenological performance.This study aimed to evaluate: cycles, thermal and growth curves of fruit subtropical conditions.For this used the following cultivars: Espada Vermelha, Keitt Palmer.All experiments were done at UNESP experimental farm Sao Manuel (SP), during agricultural cycle from 2012 2013.It was selected 15 branches each plant, which provided...

This paper presents a new approach to the classical design and implementation of Lock-In Amplifier (LIA) applied impedance measurement resistances, capacitances, inductors their arrangements. It is based on general-purpose microcontroller an active band-pass filter. Instead using phase sensitive detector (PSD), proposed LIA uses subtraction between samples recover in-phase in-quadrature. The low frequency Pulse Width Modulation (PWM) as source for reference signal Analog Digital Converter...

Uniform seed distribution upon the soil and sowing speed are directly related to crop quality productivity. The present research aims evaluate influence of monitoring sensor installation position, based on readings obtained a testing bench, during maize seeds with pneumatic meter, subjected different operating speeds. experiment eventuates static simulation completely randomized design, double factorial, first factor being position (upper, middle, lower portion conductive tube conveyor...

This paper presents a device that is able to reproduce atmospheric discharges in small scale. First, there was simulated an impulse generator circuit could meet the main characteristics of common lightning strokes waveform. Later, four different circuits were developed with selection made by microcontroller. Finally, output subject amplification increased its amplitude. The impulses generated had very similar shape compared real international standards for testing. apparatus meant...

Aim of study: This experiment's objective is to develop an automatic data acquisition system for profilometry, evaluating four harrowing speeds. Area Federal University Parana, Curitiba, Brazil. Material and methods: We experimented at the laboratory using a completely randomized design, comparing modified roughness, raised mobilized area, blistering, thickness. These were acquired with traditional electronic profilometers in seven replications. executed field test lines, design. The plots...

This study introduces a circuit designed to enhance energy conversion and storage, facilitating autonomous sustainable operation from harvested magnetic in IoT devices. Through comprehensive experimentation analysis, the circuit’s performance reliability were assessed, showcasing its potential provide dependable power supply networks. Furthermore, various scenarios with different cycles component combinations simulated validate potential. The findings indicate that integrating strategies...

O objetivo central é apresentar, de forma crítica, como ocorreu a implantação Programa, no Instituto Aplicação Fernando Rodrigues da Silveira (CAp-Uerj), destinado à formação básica pessoas jovens, adultas e idosas. Com esse artigo, pretende-se constituir um registro das memórias do Programa Educação para Pessoas Jovens, Adultas Idosas (PROEJAICAp-UERJ), considerando temporalidade inicial sua seu primeiro ano existência. isso, apresentamos reflexão discussão sobre importância experiência...

This paper presents a new approach to the classical design and implementation of Lock-In Amplifier (LIA) applied impedance measurement interdigital capacitive sensors in order evaluate water pollution. It is based on general-purpose microcontroller an active band-pass filter. The uses wave generator (AD9833) as source for reference signal Analog Digital Converter (ADC) from sample device under test (DUT) signal. In particular context this study, sensor responses are evaluated by conductance,...

The use of powdered graphite as a solid lubricant to reduce friction among soybean seeds during mechanical sowing aims facilitate the seed flow into reservoir, while reducing damage seed. objective this study was evaluate influence on longitudinal deposition using and pneumatic feeders at different distribution velocities. experiment performed static simulation-test bench, with completely randomized design two varying factors: dose (0, 1, 2, 4, 8 g kg-1 seed) velocity (5, 7, 9, 11 km h-1 for...

The carbohydrate storage is necessary to support the plant growth in periods of stress, during dormancy, beginning vegetative development and fruiting time.In this context, work intended evaluate concentrations peach (Prunus persica (L.) Batsch) tree 'BRS Rubimel', cultivated under subtropical conditions.The experiment was performed at experimental farm Lageado, Faculty Agricultural Sciences UNESP Botucatu/SP.The evaluated trees were two years old spacing 6.0 x 4.0 m.The adopted delineation...

This paper presents the results of an evaluation soil parameters when submitted to high frequencies voltages generated by impulse generator prototype. First, there was construction device that will generate impulses. Although amplitude signal is low compared conventional generators, wave-shape produced similar one actual atmospheric discharge and try follow requirements standards from International Electrotechnical Commission. Second, are made some tests in ground using device, having...

The main goal of this paper is to present the design a surface electromyography acquisition, processing and amplification system with low power consumption. Based on micro-controller Bluetooth module, it must send data cell phone in real time. topology based an operational amplifier passive components order produce filters instrumentation applied Electromyography (EMG). This also shows equations used during describes each step development, from simulations testing acquired microcontroller...

In this work a lighting study of high-power light-emitting diode (HP-LED) luminaire is presented. Some experimental simulations are performed in two case studies. The temperature behavior the also evaluated (with and without forced cooling) as increases number active LEDs luminaire. illuminance each LED still related increases. Through model designed stochastic ray tracing simulation software, with 1 million rays obeying same technical specifications practical experimentation. results...

ABSTRACT The quality of soil tillage can be measured with a specific device called profilometer, which provides information on roughness, mobilized area, blistering, and thickness in disturbed soils. However, it is an outdated device, requiring many hours field office work. Thus, the objective present work was to develop electronic profilometer using laser triangulation ultrasound sensors for measurement digitally profile. results obtained were compared those acquired conventional sliding...

The success of crops is directly related to effective planting and fertilization, especially regarding yield factors like plants per area final yield. Thorough evaluations are vital understanding modern methods in these operations. Current regulations their broaden scope highlight the need for more specific approaches. This study aimed validate a new method assessing effectiveness helical fluted dosing mechanisms with two granulated fertilizer formulations (04-14-08 [GF1] 04-30-10 [GF2]) at...

ABSTRACT: The uniformity of seed distribution and sowing speed directly impact crop quality productivity. This experiment assessed how the position monitoring sensor influences cotton seeds using a pneumatic meter at different operating speeds. employed completely randomized two-factor factorial design on static simulation bench. first factor involved installation sites (upper, middle, lower portions conductor tube conveyor belt), while second encompassed simulated speeds 3.0, 5.0, 7.0, 9.0,...

Tests with agricultural tires and wheelsets allow for mitigating the machinery traffic limitations to crop productivity, as it shows tire-surface interaction under different suitability conditions, optimizing farming processes use of technology. Thus, this paper aims develop an electro-hydraulic press dynamically measuring elastic deformations occurring in tires. The experiment used a completely randomized design, evaluating two pneumatic wheelsets, bias-ply radial, six vertical loads,...

In this paper, it is described a new design of digital Lock-In amplifier applied to 4-Kelvin- probe electrodes for the measurement complex electrical variables. The proposed based on operation Phase Sensitive Detection (PSD) circuit and signal acquisition by Nyquist principle. hardware basically consists programmable embedded system an analog interfacing circuit. microcontroller within was programmed using standard C language portability performs resulting along with mathematical operations....

The fading phenomenon in mobile communications is mainly a stochastic process and plays an essential role the reliability stability of systems. frequency bands currently use it reasonably well characterized described. With mmW, only experimental, theoretical models are being proposed; there no unanimity regarding model that effectively contemplates this spectrum range. Some studies suggest traditional applied to frequencies use; Rician Rayleigh main ones. This study aims advance compare,...