Research on image processing algorithm of immune colloidal gold test paper detection

In order to better solve the problem of automatic identification of quality control line and detection line in the detection of gold standard test strip, this paper proposes to collect the image information of gold standard test strip after color rendering through CMOS sensor, preprocess the obtained information, transform RGB image into gray image, build cloud model in the CIELAB/HSV/HSL space, and apply the improved AdaBoost algorithm to determine the position of detection line and quality control line Place. Compared with the traditional template matching method, it improves the accuracy and accuracy of recognition

A Modified Nonlinear Conjugate Gradient Method for Engineering Computation

A general criterion for the global convergence of the nonlinear conjugate gradient method is established, based on which the global convergence of a new modified three-parameter nonlinear conjugate gradient method is proved under some mild conditions. A large amount of numerical experiments is executed and reported, which show that the proposed method is competitive and alternative. Finally, one engineering example has been analyzed for illustrative purposes

Research on curve smoothing algorithm for diesel indicator diagram

The algorithm of curve smoothing for diesel indicator diagram is introduced, and the concrete implementation process is expounded in detail. First, the multi cyclic mean value operation of indicator diagram data is performed. By probable error of calculating indicator diagram data, if probable error is greater than a specific value, and the predicted value is used instead of the singular point data. The average operation of the indicator diagram data is processed again. Finally, the five-point cubic smoothing method is used to smooth the indicator curve, and the smooth, continuous and gradual indicator diagram curve is obtained. The experiments show that the algorithm described in the paper can effectively filter the noise of cylinder pressure signal, and obtain a smooth indicator diagram curve, which verifies the effectiveness of the algorithm described in the paper

Molecular processes of ion effects on aqueous nanofilm rupture

Much progress has been made in the understanding and application of specific ion effects; however, a detailed interpretation of film stability regarding the ion effect has not yet been achieved. This research aims at developing an understanding of the physico-chemical colloidal aspects in an endeavor to acquire an ability to predetermine specific ion effects on nanofilm rupture. Despite the series of reports published regarding the surfactant-free films, the experimental technique proved nearly to be unable to provide further convincing interpretation towards this issue. Molecular dynamics (MD) technique was applied to investigate the effect of salt ions on film stability in various concentrations with pair-additive and many-body polarizable water-ion potentials to validate with certainty the rupture process of aqueous nanofilms in the absence and presence of salts. Properties of the liquid film including dipole moment, molecular distribution profiles, together with a detailed quantitative analysis of film rupture, potential energy, evidences e.g. ion-water binding energy, Dipole Autocorrelation Functions (DAFs) and disjoining pressure isotherm data were examined. The DAFs of water within the film were observed to be stronger in salt films than in a pure water film. The results show that salt ions destabilize the nanofilms at low concentrations, while the ability of salt to break the films depends on the strength of the ion-water interaction and the molecular partition at the film surfaces

Surface force at the nano-scale: Observation of non-monotonic surface tension and disjoining pressure

Nano bubbles and films are important in theory and various applications, such as the specific ion effect of bubble coalescence, flotation and porous medium seepage; these rely greatly on the fundamental aspects of extended-DLVO surface forces. However, the origin and validation of the non-DLVO forces are still obscure, especially at the nano scale (1–5 nm). Herein, we report the first determination of the disjoining pressures of aqueous electrolyte nano-films using molecular dynamics (MD) simulations. Our results showed that adding salt does not lead to a decrease in the disjoining pressure. On the contrary, higher concentrations results in greater disjoining pressures. In addition, the temperature was found to significantly change the pattern of the disjoining pressure isotherm. These results aid the understanding of a number of underlying mechanisms, involving nano solid–liquid–gas surfaces

Accelerated aqueous nano-film rupture and evaporation induced by electric field: a molecular dynamics approach

The interfacial heat and mass transfer at nano-scale are the key procedure of various phase changes phenomena, and are of significant importance for both science and engineering applications. In the present work, molecular dynamics simulations were applied to investigate the influence of external electric field on the rupture and evaporation of aqueous thin films, which is crucial for bubble coalescence within the context of flotation. The properties of pure water and saline liquid thin films at the absence and presence of parallel electric fields were examined with field intensity ranging from 0.1 to 10 V/nm. It was observed that for relatively thick film, which is very stable (4 × 4 × 1.45 nm) with infinite life time under the electric-field free condition, by incorporating an electric field, the rupture process was significantly accelerated with increases in the field strength. With the field strength reaches up to a threshold at 2–2.5 V/nm, the rupture occurred nearly instantly and temperature increased due to molecular friction, a further increase of strength resulted in thermostat’s improper working and the evaporation of molecules. The surface tension exhibits a decreasing trend when the field strength is below 1 V/nm, surface tension cannot be correctly measured when the field intensity is above 2 V/nm due to the influence of rupture and evaporation. This result provides a theoretical guidance with external electric field for nano-electric transfer, regarding the potential of electro-coalescence between bubbles during flotation process

Quantitative Investigation of Roasting-magnetic Separation for Hematite Oolitic-ores: Mechanisms and Industrial Application

Natural high-quality iron can be directly applied to pyro-metallurgy process, however, the availability of these ores has become less and less due to exploitation. This research reports a systematic approach using reduction roasting and magnetic separation for oolitic iron ores from west Hubei Province. Firstly, a mineralogical study was performed and it was shown that the oolitic particles were mainly composed of hematite, with some silicon-quartz inside the oolitic particle. Then, the roasting temperature was examined and shown to have significant influence on both Fe recovery and the Fe content of the concentrate. Also the Fe content gradually increased as the temperature increased from 700 to 850 °C. The most important aspects are the quantitative investigation of change of mineral phases, and reduction area (with ratio) during the reduction roasting process. The results showed that Fe2O3 decreased with temperature, and Fe3O4 (magnetite) increased considerably from 600 to 800 °C. The reductive reaction was found to occur from the outside in, the original oolitic structure and embedding relationship among the minerals did not change after roasting. Finally, 5% surrounding rock was added to mimic real industrial iron beneficiation. This study could provides useful insight and practical support for the utilization of such iron ores

Molecular simulations of sputtering preparation and transformation of surface properties of Au/Cu alloy coatings under different incident energies

The surface properties of coatings during deposition are strongly influenced by temperature, particle fluxes, and compositions. In addition, the precursor incident energy also affects the surface properties of coatings during sputtering. The atomistic processes associated with the microstructure of coatings and the surface morphological evolution during sputtering are difficult to observe. Thus, in the present study, molecular dynamics simulation was employed to investigate the surface properties of Au/Cu alloy coatings (Cu substrate sputtering by Au atoms) with different incident energies (0.15 eV, 0.3 eV, 0.6 eV). Subsequently, the sputtering depth of the Au atoms, the particle distribution of the Au/Cu alloy coating system, the radial distribution function of particles in the coatings, the mean square displacement of the Cu atoms in the substrate, and the roughness of the coatings were analyzed. Results showed that the crystal structure and the sputtering depth of Au atoms were hardly influenced by the incident energy, and the incident energy had little impact on the motion of deep-lying atoms in the substrate. However, higher incident energy resulted in higher surface temperature of coatings, and more Au atoms existed in the coherent interface. Moreover, it strengthened the motion of Cu atoms and reduced the surface roughness. Therefore, the crystal structure of coatings and the motions of deep-lying atoms in the substrate are not influenced by the incident energy. However, the increase in incident energy will enhance the combination of coatings and the base while optimizing the surface structure