Papers by Paulo Estevao Cruvinel
Heavy machinery process results in the loss of valuable soil and its nutrients that are necessary... more Heavy machinery process results in the loss of valuable soil and its nutrients that are necessary for crops to grow. Tillage erosion is mostly caused by the way a farmer tills the land. The kind of machinery a farmer uses, how often the farmer tills the fields, and how the farmer manages the agricultural fields during the planting periods affects how much soil may be lost. This work demonstrates the suitability of PIXE for evaluation of agricultural nutrient losses due to tillage erosion processes. A case study for a sugar-cane field is discussed, and losses in concentration of elements such as P Q<a=2.015keV), K Q<a=3.312keV), Ca (Ka=3.690keV), Fe (Ka=6.400keV), and Zn (Ka=8.631keV) were evaluated. The feasibility of this methodology for agricultural nutrient loss measurements for tillage erosion process is presented.
bitstream/item/83926/1/Proci-11.00185.pdf; bitstream/item/98922/1/PROCI-11.00185.pd
Todos os direitos reservados. A reprodução não-autorizada desta publicação, no todo ou em parte, ... more Todos os direitos reservados. A reprodução não-autorizada desta publicação, no todo ou em parte, o constitui violação dos direitos autorais (Lei n 9.610). CIP-Brasil. Catalogação-na-publicação. Embrapa Instrumentação
Revista Brasileira De Ciencia Do Solo, 1992
Proceedings SIBGRAPI'98. International Symposium on Computer Graphics, Image Processing, and Vision (Cat. No.98EX237)
Page 1. 1 A Technique for Improvement of Linear Attenuation Coefficient Maps Obtained by Means of... more Page 1. 1 A Technique for Improvement of Linear Attenuation Coefficient Maps Obtained by Means of X-Ray Tomography in Multiple Energies Luis Fernando Granato Paulo Estevão Cruvinel Fabio Cassaro Silvio Crestana. EMBRAPA ...
... Álvaro Macedo2 Carlos Manoel Pedro Vaz3 Paulo Estevão Cruvinel4 Sílvio Crestana3 ... Estão se... more ... Álvaro Macedo2 Carlos Manoel Pedro Vaz3 Paulo Estevão Cruvinel4 Sílvio Crestana3 ... Estão sendo trabalhados os pontos mais críticos para se chegar à resolução de 100µm, tais como uma nova versão da centralização do estágio de rotação, maior precisão no suporte de ...
Método de reconhecimento de padrões de plantas invasoras de folhas largas e estreitas da cultura ... more Método de reconhecimento de padrões de plantas invasoras de folhas largas e estreitas da cultura do milho (Zea mays L.) baseado no uso de informações de textura e visão computacional
2017 IEEE 11th International Conference on Semantic Computing (ICSC), 2017
This paper presents a computational method used to estimate the parameters of a demand forecastin... more This paper presents a computational method used to estimate the parameters of a demand forecasting equation, and its semantic interpretation, that describes the behavior of a generation of weeds in an agricultural field. Its implementation was made with a genetic algorithm (GA) structured by evolutionary logic, which uses the technique of identification of the function parameters from the seeds density of weed on an experimental field. In order to evaluate and validate the developed technique, a seeds density of weed database was generated from the application of original parameters of the weed Abutilon theophrasti which can be found in a maize crop (Zea mays) area. This database was used, and the GA demonstrated a high efficacy. In 38% of the analyzed cases, the fitness was below 5 for 100 realized experiments. This associated variable, i.e, for each analyzed individual, is related to the mean square error (MSE), which has its existence in the domain 0 ≤ MSE < ∞.
Sensors, 2021
One of the major problems facing humanity in the coming decades is the production of food on a la... more One of the major problems facing humanity in the coming decades is the production of food on a large scale. The production of large quantities of food must be conducted in a sustainable and responsible manner for nature and humans. In this sense, the appropriate application of agricultural pesticides plays a fundamental role since pesticide application in a qualified manner reduces human and environmental risks as well as the costs of food production. Evaluation of the quality of application using sprayers is an important issue, and several quality descriptors related to the average diameter and distribution of droplets are used. This paper describes the construction of a data-driven soft sensor using the parametric principal component regression (PCR) method based on principal component analysis (PCA), which works in two configurations: with the input being the operating conditions of the agricultural boom sprayers and its outputs being the prediction of the quality descriptors of ...
Sensors & Transducers, 2016
This paper presents an arrangement based on a dedicated computer and charge-coupled device (CCD) ... more This paper presents an arrangement based on a dedicated computer and charge-coupled device (CCD) sensor system to intelligently allow the counting and recognition of colony formation. Microbes in agricultural environments are important catalysts of global carbon and nitrogen cycles, including the production and consumption of greenhouse gases in soil. Some microbes produce greenhouse gases such as carbon dioxide and nitrous oxide while decomposing organic matter in soil. Others consume methane from the atmosphere, helping to mitigate climate change. The magnitude of each of these processes is influenced by human activities and impacts the warming potential of Earth's atmosphere. In this context, bacterial colony counting is important and requires sophisticated analysis methods. The method implemented in this study uses digital image processing techniques, including the Hough Transform for circular objects. The visual environment Borland Builder C++ was used for development, and ...
In agriculture, the chemicals should be applied evenly and at a prescribed rate. An accurately ca... more In agriculture, the chemicals should be applied evenly and at a prescribed rate. An accurately calibrated boom will ensure that this is achieved. In addition, the correct use of pesticides can deliver significant environmental and socioeconomic benefits in the form of safe, healthy, and affordable food, as well as to decrease the impact in natural resources such as soil, water and overall land use. The quality of pesticides application is dependent on the hydraulic fluidic resistance present in the nozzles of the sprayers. This paper presents a method to evaluate the hydraulic pressure drop in bars of agricultural sprayer systems using the fluid hydraulic resistance as a part of a sensor element associated with point-wise Thévenin's equivalents. This method makes it possible to control and measure the pressure drop at lower cost and greater accuracy. In this context, taking into account a measurement-based approach, a parameterized relationship among operating conditions and the...
This paper presents a thermal detector using an inorganic crystal based on a chemical compound pr... more This paper presents a thermal detector using an inorganic crystal based on a chemical compound prepared with PbZrO 3 /PbTiO 3 with 1% of La 2 O 3. It has been designed for measuring the absorbed dose due the use of an electron beam applied for the disinfection of food products. The measuring arrangements for validation of the sensor were all carried out based on the use of incident doses up to 10 kGy, i.e., using several exposure times from a linear electron accelerator source with selective voltage in the range of 200 kV to 10,000 kV. For a given energy, the detector has a linear response with beam intensity and an inverse response with chopping frequency. A calibration curve which reports the relation of the absorbed dose (kGy) versus the sensor´s amplified output voltage is also presented. The detector may be used over a wide range of energies either inside or outside vacuum, and it does not require an external bias field. Results have shown the usefulness of such agricultural se...
Commodities are primary goods, with low levels of industrialization, include the agricultural, me... more Commodities are primary goods, with low levels of industrialization, include the agricultural, metal and energy sectors. The agricultural commodities have an important role in Brazil's economy, accounted by 46.7% of total exports in 2013. Given the economic relevance to productive matrix of Brazilian agribusiness, investment in commodity assets can be an alternative to reduce portfolio risk. This paper intends to measure the systematic risk of price for Brazilian and International commodities to changes in the portfolio of commodities market (Brazilian and International) and financial market (IBOVESPA and S&P 500). We use monthly data from January 1998 to March 2014. The results indicate that Brazilian commodities have a high sensitivity to the domestic commodities market and the local financial market. These results suggest the existence of a common risk factor in the commodities market, which differs from the results of many previous studies. Therefore, the effect of Brazilian...
In pesticide application based on direct injection systems , the sprayer response time plays an i... more In pesticide application based on direct injection systems , the sprayer response time plays an important role for the spraying quality, mainly when operating in real time. The response time is defined as the time elapsed from the time of injection until the concentration of the mixture (water mixed with herbicide) reaches 95% of its regime value in the spray nozzles. Therefore, in the response time the transport delay and the rise time for achieving the desired concentration are considered. This paper describes an intelligent sensor mounted near the spray nozzles to measure the concentration response time in a herbicide direct injection system, which uses a highly stable sinusoidal excitation signal. The sensor calibration was performed with NaCl solutions at concentrations similar to those found in actual application conditions. Using an integrated system based on the Arduino platform, an algorithm was developed to relate the measurements to the response time. The integrated syste...
This paper presents an arrangement based on a customized computer and Charge-Coupled Device (CCD)... more This paper presents an arrangement based on a customized computer and Charge-Coupled Device (CCD) sensor system to allow the counting and recognition of the colony formation, in an intelligent manner, of live bacteria. Microbes in agricultural environments are important catalysts of global carbon and nitrogen cycles, including the production and consumption of greenhouse gases in soil. The magnitude of this process is influenced by human activities and impacts the warming potential of Earth's atmosphere. The method implemented uses techniques of digital image processing, and among them, Hough Transform for circular objects. For calibration and validation of the method, a RGB (Red-Green-Blue) camera based on the CCD was used, as well as a prepared illuminated chamber, to allow the analysis of the bacteria Escherichia Coli and Acidithiobacillus ferrooxidans. The visual environment, Borland Builder C++, was used for the development, and a modeling for decision making was incorporat...
in Venice, Italy, was an inaugural event covering related topics on theory practice and applicati... more in Venice, Italy, was an inaugural event covering related topics on theory practice and applications of sensor devices, techniques, data acquisition and processing, and on wired and wireless sensors and sensor networks. Sensors and sensor networks have a great potential of providing diverse services to a broad range of applications, not only on science and engineering, but equally importantly on issues related to critical infrastructure protection and security, healthcare, the environment, energy, food safety, and the potential impact on the quality of all areas of life. Sensor networks and sensor-based systems support many applications today above ground. Underwater operations and applications are quite limited by comparison. Most applications refer to remotely controlled submersibles and wide-area data collection systems at a coarse granularity. Other remote sensing domains and applications are using special sensing devices and services. Transducers and actuators complement the mo...
Related to the quality of the agricultural spraying processes, the variable hydraulic pressure pl... more Related to the quality of the agricultural spraying processes, the variable hydraulic pressure plays an important role. All spray nozzles when operating are subjected to the hydraulic pressure along the boom. Furthermore, in real sprayers systems the losses in the hydraulic pressure which occur along the boom, where one may find the placed nozzles, are in general verified with the use of pressure sensors in each nozzle. However, such arrangement has high costs for the agricultural producers and involves a larger complexity in the electronics for signal processing, monitoring and control. The hydraulic system of agricultural sprayers has a direct analog in electric circuits, and thus, it is possible to be represented as an equivalent circuit formed by a voltage source and a resistance which characterizes the internal loss of the system. This paper, presents a method that makes possible the evaluation of the hydraulic pressure drop in bars of sprayer systems considering the fluid hydr...
Chan, F., Marinova, D. and Anderssen, R.S. (eds) MODSIM2011, 19th International Congress on Modelling and Simulation., 2011
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Papers by Paulo Estevao Cruvinel