This work presents quantitative prediction of severity the disease caused by Phytophthora infestans in potato crops using machine learning algorithms such as multilayer perceptron, deep convolutional neural networks, support vector regression, and random forests. The are trained datasets extracted from multispectral data captured at canopy level with an unmanned aerial vehicle, carrying inexpensive digital camera. results indicate that forests perceptron band differences can predict...

High silicon and molybdenum (SiMo) ductile irons present a metallic matrix composed principally of ferrite with little volume fraction pearlite carbides. In this work, two SiMo similar levels silicon, 0.3% Mo (DI-0.3Mo) 0.6% 0.8% Co (DI-0.6Mo-0.8Co), were evaluated to determine the effect cobalt on microstructure, hardness, wear performance at room temperature. The microstructural characterization was performed using light microscopy SEM-EDS. At same time, mechanical carried out Rockwell C...

Although the porosity in Al-SiC metal matrix composites (MMC) can be diminished; its existence is unavoidable. The purpose of this work to study effect on Young’s modulus SiC reinforced aluminum composites. Finite element analysis performed based unit cell and representative volume approaches. reliability models validated by comparing numerical predictions against several experimental data ranging low- high-volume fractions good agreement found. It found that despite stress transfer from...

Ductile iron contains free graphite nodules within the metallic matrix, which generally consists of ferrite and pearlite in as-cast condition. The casting thicknesses have a great influence on size, shape, quantity microconstituents matrix thus mechanical properties. In this study cooling rate (caused by thicknesses) nodular characteristics low alloyed ductile with 0.8 %Ni 0.15 %V was investigated. produced sandwich process ladle inoculation. Six plates different thicknesses, from 4.3 mm to...

The present study focuses on the effect of various degrees plastic deformation generated by cold radial forging mechanical properties and fracture morphology 32 CDV 13 steel. percentage was evaluated for 17.45, 33.30, 42.0 46.47 %. microstructural analysis steel shows tempered martensite. tensile strength, yield strength hardness were found to increase with due energy stored in material during forging. For higher percentage, toughness decreased according reduction absorbed obtained...

El objetivo de este estudio es analizar el efecto del contenido MgO y la basicidad escoria sobre estabilidad las especies mineralógicas sistema SiO2-CaOMgO-Cr2O3. Se realizaron ensayos al equilibrio a 1600 °C bajo condiciones reductoras (pO2=10-9atm). fue 0 12 % masa, Cr2O3 10% 1 1,5. También se realizó un análisis termodinámico para determinar fases más estables en escoria. Los resultados experimentales calculados muestran que encuentra principalmente ligado una fase espinela MgCr2O4,...

Different processing routes have been developed to increase the strength and hardness of camshafts for automotive applications. In this work, two carbidic austempered ductile irons (CADIs), alloyed with 0.2 0.4 wt% Cr, were evaluated determine their suitability in camshaft production by microscopy techniques mechanical tests. The CADIs produced at austempering temperatures 265 305 °C, during 30, 60, 90, 120 min. microstructural characterization was carried out optical microscopy, while...

Closed-cell A356 aluminum alloy foams refined and modified were successfully fabricated by using barite calcium carbonate as thickening foaming agents, respectively. A melt treatment consisting of adding master alloys Al-5Ti-1B Al-10Sr for refining the dendritic microstructure modifying primary eutectic silicon, respectively, included in process. The mechanical properties manufactured analyzed compared with produced without treatments. secondary arm spacing (SDAS) was determined optical...

During the electrolytic production of zinc, iron in solutions is mainly controlled by precipitation jarosite. This precipitate also contains valuable metals (Zn, Pb, Cu, Ag) and toxic elements (Hg, Cd, As). study deals with pyrometallurgical treatment jarosite waste order to recover metal values convert into environmentally acceptable slag. Initially, sample was heated 100?C remove moisture, then roasted at 700?C release some OH? sulfate groups thermal decomposition. The analysis...

Ferromagnetic shape memory (FSM) alloys are scientifically and technologically interesting materials that combine ferromagnetism with a reversible martensitic phase transformation. Fe70Pd30 has recently been shown to display FSM effect at usable temperatures low fields. Reported here results of experimental studies on electronic structure calculations Fe70Pd30−xPtx. The show additions Pt by 6 % can triple the magnetocrystalline anisotropy. There is, however, large discrepancy between...

The effect of the casting modulus on distribution and features graphite in hypo-eutectic ductile iron unalloyed alloyed with nickel (0.88 wt %) was studied. cooling rate plates 25.4, 12.7 8.5 mm thickness a 6.87, 4.46 3.31 mm, respectively promotes several microstructural changes, such as cementite precipitation noticeable nodule count increment. addition suppressed formation improved nodularity for three evaluated. increased 69, 67 128 % 3.31, 6.87 respectively, regarding iron. It found...

In the present study, ductile iron camshafts low alloyed with 0.2 and 0.3 wt % vanadium were produced to study microstructural mechanical evaluation of lobes camshaft. For this purpose, in one largest manufacturers camshaft México by phenolic urethane no-bake sand mold casting method. The microstructure was studied three zones located at top, middle, bottom optical microscopy, tests performed on camshafts. A homogeneous distribution spheroidal graphite high nodularity for both castings...

A viscosity model for binary and ternary silicate melts is proposed in this article. The temperature dependence of expressed using the Arrhenius equation composition made through concentration oxygen bridges (Si–O–Si) silica structure. previous structural thermodynamic used to calculate content bridges. requires only three parameters obtain a good agreement between experimental calculated data SiO2–CaO, SiO2–MgO, SiO2–MnO, SiO2–Na2O systems. systems with assuming linear function from...

Samples of ductile iron alloyed with 0.88 % Ni a nodule count 606, 523, and 290 nod/mm2 were obtained from sand cast plates different thickness in the range 8.46 to 25.4 mm. The effect was evaluated during austempering process held at 285?C times 15, 30, 45, 60, 70, 90 min. volume fraction high carbon austenite increased when increased, however, content kept almost constant. window narrow, requiring lower time increased. combination higher low temperature allowed obtaining fine ausferritic...

The mineralogy and thermal properties of two kaolin clay samples from Agua Blanca (Hidalgo-México) were determined by XRD, SEM-EDS, TGA-DSC techniques.Kaolin A contains a higher Al2O3 lower impurities (K2O, TiO2, Fe2O3) amount than B, while the SiO2 is similar for both clays.A theoretical approach was carried out thermodynamic analysis considering chemical composition with FactSage 7.3 software.Stability phase diagrams obtained to different K2O content 0.1 3 wt % temperatures in range 600...