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1
Posada Rodríguez, M. J., I. J. Suárez Rodríguez e J. Sáiz de Ayala. "Sintering process burn-through point modelization". Revue de Métallurgie 106, n. 6 (giugno 2009): 225–33. http://dx.doi.org/10.1051/metal/2009038.
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Stroe, M. C., e J. M. Crolet. "Modelization of osteoporosis process: a possible explanation". Computer Methods in Biomechanics and Biomedical Engineering 14, sup1 (agosto 2011): 177–79. http://dx.doi.org/10.1080/10255842.2011.594711.
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Zanoli, Silvia Maria, Crescenzo Pepe, Elena Moscoloni e Giacomo Astolfi. "Data Analysis and Modelling of Billets Features in Steel Industry". Sensors 22, n. 19 (27 settembre 2022): 7333. http://dx.doi.org/10.3390/s22197333.
Abstract (sommario):
This study proposes a data analysis and modelization method for the rolling mill process of billets in steel plants. By exploiting rolling mill signals and advanced data processing algorithms, a reliable billet tracking system is designed, which tracks each workpiece from the furnace entrance to the rolling mill stands’ exit area. Based on the stored information, two problems are addressed: the data analysis of the temperature sensors (a thermal imaging camera and pyrometers) and the current that is related to the rolling mill stands’ absorption, and subsequently, a mathematical modelization of the billets’ temperature along their path in the rolling mill is produced. The data analysis suggested that we should perform hardware modifications: the thermal imaging camera was repositioned to avoid the effect of scale formation on the temperature measurements. The modelization phase provided the basis for future control and/or diagnosis applications that will exploit a temperature decay model.
4
Boly, V., L. Morel e J. Renaud. "A Functional Modelization of Innovation Process: Results of an Expert Inquiry". IFAC Proceedings Volumes 33, n. 12 (giugno 2000): 221–24. http://dx.doi.org/10.1016/s1474-6670(17)37313-5.
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Chevalier, Damien, Pierre Cezard, Laurent Langlois e Régis Bigot. "Modelization of the Rolling Mill with a FE Code". Key Engineering Materials 651-653 (luglio 2015): 291–96. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.291.
Abstract (sommario):
To reduce production costs and to improve performances of hot rolled products, it is necessary to optimize the production line. The rolling mill is one of the major factors which affect the internal quality. In fact the process tends to reduce the size of defects during the strain. The production line consisting of 24 stands has been modeled with a commercial FE-code FORGE®. First, a model has been developed and adjusted according to industrial data. Then a parametric study was carried out in order to estimate the influence of the process parameters on the internal quality of the rolled material.
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MURAJI, Yutaro. "CREATING ARCHITECTURAL DESIGN AS COMMON RESOURCE AND MODELIZATION OF ITS DEVELOPMENT PROCESS". AIJ Journal of Technology and Design 27, n. 65 (20 febbraio 2021): 406–11. http://dx.doi.org/10.3130/aijt.27.406.
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Papageorgiou, Loula, Kutaiba Alhaj Hussen, Sandrine Thouroude, Elisabeth Mbemba, Héléne Cost, Laurent Garderet, Ismail Elalamy et al. "Modelization of Blood-Borne Hypercoagulability in Myeloma: A Tissue-Factor-Bearing Microparticle-Driven Process". TH Open 03, n. 04 (ottobre 2019): e340-e347. http://dx.doi.org/10.1055/s-0039-1700885.
Abstract (sommario):
Abstract Introduction Hypercoagulability is a common blood alteration in newly diagnosed chemotherapy naïve patients with multiple myeloma. The identification of the procoagulant potential of cancer cells, which is principally related to tissue factor (TF) expression, attracts particular interest. The mechanisms by which myeloma plasma cells (MPCs) activate blood coagulation have been poorly investigated. Aim To identify the principal actors related with MPCs that boost thrombin generation (TG). Methods TF and annexin V expression by MPCs and MPC-derived microparticles (MPC-dMPs) was analyzed by flow cytometry. TF activity (TFa) and TF gene expression were also determined. TG in the presence of MPCs or MPC-dMPs was assessed with the calibrated automated thrombogram assay (CAT) in normal human PPP and in plasma depleted of factor VII or XII. TG was also assessed in plasma spiked with MPCs and MPC-dMPs. Results MPC-dMPs expressed approximately twofold higher levels of TF as compared with MPCs. The TFa expressed by MPC-dMPs was significantly higher compared with that expressed by MPCs. MPCs and MPC-dMPs enhanced TG of human plasma. TG was significantly higher with MPC-dMPs compared with MPCs. Conclusion MPCs indirectly induce blood-borne hypercoagulability through the release of MPC-dMPs rich in TF. Since MPCs, expressing low TFa, represent a weak procoagulant stimulus, the hypercoagulability at the microenvironment could be the resultant of MPC-dMPs rich in TF.
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Sellés, M. A., S. R. Schmid, S. Sánchez-Caballero, E. Pérez-Bernabeu, M. J. Reig e V. J. Segui. "Theoretical Model of a Multi-Layered Polymer Coated Steel-Strip Ironing Process Using a Neural Network". Materials Science Forum 713 (febbraio 2012): 139–44. http://dx.doi.org/10.4028/www.scientific.net/msf.713.139.
Abstract (sommario):
An alternative to the traditional can manufacturing process is to use plastic laminated rolled steels as base stocks. This material consist of pre-heated steel coils that are sandwiched between one or two sheets of polymer. The heated sheets are then immediately quenched, which yields a strong bond between the layers. Such polymer-coated steels were investigated by Jaworski [1, and Sellés [, and found to be suitable for ironing with carefully controlled conditions. A novel multi-layer polymer coated steel has been developed for container applications. This material presents an interesting extension to previous research on polymer laminated steel in ironing, and offers several advantages over the previous material (Sellés [). This document shows a modelization for the ironing process (the most crucial step in can manufacturing) done by using a neural network.
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Zhang, Chao, Xiao Guang Yang, Jian Hua Zhou e Ai Jun Huang. "Modelization and Validation of Ti-6Al-4V Alloy Material Constitutive Law for Isothermal Forging Process". Key Engineering Materials 622-623 (settembre 2014): 207–16. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.207.
Abstract (sommario):
Isothermal forging is a near-net shape forming technology for manufacturing complex titanium alloy components. In order to characterize the workability of Ti-6Al-4V alloy during isothermal forging process, the material properties of Ti-6Al-4V alloy were investigated by isothermal compression tests under different strain rate-temperature, where the temperature range is 850~1000 °C and strain rate range is 0.001~0.05s−1. The obtained flow stress-strain data was used to develop the Arrhenius constitutive model of which material constants considered the compensation of strain. The developed constitutive model was used to simulate the isothermal forging process of Ti-6Al-4V alloy component by finite element (FE) based numerical method. The metal flow and potential defect locations were predicted by numerical simulation. Furthermore, the relevant simulation results were compared with the product in industrial workshop to demonstrate the validity of material constitutive model. Keywords: Isothermal forging; Ti-6Al-4V alloy; Hot compression test; Arrhenius constitutive model; FE analysis; Model validation;
10
Massironi, Carlo. "Philip Fisher’s sense of numbers". Qualitative Research in Financial Markets 6, n. 3 (10 novembre 2014): 302–31. http://dx.doi.org/10.1108/qrfm-01-2013-0004.
Abstract (sommario):
Purpose – This paper aims to propose an account of the use of numbers and mathematical formulae and, more generally, of the quantitative aspects in the qualitative equity valuation model of the American investor Philip A. Fisher who is considered to be one of the fathers of the qualitative equity valuation models. Design/methodology/approach – A Conceptual analysis was conducted (Glasersfeld, 1992) of the four volumes published by Fisher between 1954 and 1980 (1958, 1960, 1975, 1980) in relation to his equity valuation process. On the basis of this analysis, a modelization of this author’s perspective on quantitative instruments was built. Findings – A modelization to use quantitative data in a qualitative equity valuation model that is sufficiently detailed and useful for an asset manager is proposed. Originality/value – What is propose is a qualitative analysis of quantitative elements in the thought of a qualitative author on the subject of equity valuation. It is believed that this paper could be of interest to all those who use or are involved in the development of qualitative models of equity valuation or business valuation. This work is also an example of how conceptual analysis – generally employed in the field of mathematics education research – can be used to build descriptive models of decision-making processes of individual investors, models designed to enable the reproduction/approximation of the conceptual operations of the investor.
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Zanoli, Silvia Maria, Crescenzo Pepe, Giacomo Astolfi e Francesco Luzi. "Reservoir Advanced Process Control for Hydroelectric Power Production". Processes 11, n. 2 (17 gennaio 2023): 300. http://dx.doi.org/10.3390/pr11020300.
Abstract (sommario):
The present work is in the framework of water resource control and optimization. Specifically, an advanced process control system was designed and implemented in a hydroelectric power plant for water management. Two reservoirs (connected through a regulation gate) and a set of turbines for energy production constitute the main elements of the process. In-depth data analysis was carried out to determine the control variables and the major issues related to the previous operation conduction of the plant. A tailored modelization process was conducted, and satisfactory fitting performances were obtained with linear models. In particular, first-principles equations were combined with data-based techniques. The achievement of a reliable model of the plant and the availability of reliable forecasts of the measured disturbance variables—e.g., the hydroelectric power production plan—motivated the choice of a control approach based on model predictive control techniques. A tailored methodology was proposed to account for model uncertainties, and an ad hoc model mismatch compensation strategy was designed. Virtual environment simulations based on meaningful scenarios confirmed the validity of the proposed approach for reducing water waste while meeting the water demand for electric energy production. The control system was commissioned for the real plant, obtaining significant performance and a remarkable service factor.
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Shalom, Allen L., Francis Lancelot e Israel J. Lin. "Multigradient Dielectrophoresis: Wire Grid Matrix Optimization and Current Modelization at High Loading". Separation Science and Technology 24, n. 3-4 (marzo 1989): 179–97. http://dx.doi.org/10.1080/01496398908049762.
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Costarelli, Danilo, Anca Croitoru, Alina Gavriluţ, Alina Iosif e Anna Rita Sambucini. "The Riemann-Lebesgue Integral of Interval-Valued Multifunctions". Mathematics 8, n. 12 (20 dicembre 2020): 2250. http://dx.doi.org/10.3390/math8122250.
Abstract (sommario):
We study Riemann-Lebesgue integrability for interval-valued multifunctions relative to an interval-valued set multifunction. Some classic properties of the RL integral, such as monotonicity, order continuity, bounded variation, convergence are obtained. An application of interval-valued multifunctions to image processing is given for the purpose of illustration; an example is given in case of fractal image coding for image compression, and for edge detection algorithm. In these contexts, the image modelization as an interval valued multifunction is crucial since allows to take into account the presence of quantization errors (such as the so-called round-off error) in the discretization process of a real world analogue visual signal into a digital discrete one.
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Suzzi, Nicola, e Giulio Croce. "Numerical modelization of contact angle hysteresis of falling droplet under enhanced lubrication approximation". Journal of Physics: Conference Series 2177, n. 1 (1 aprile 2022): 012043. http://dx.doi.org/10.1088/1742-6596/2177/1/012043.
Abstract (sommario):
Abstract Moving contact lines are involved in several engineering applications: in in-flight icing phenomenon, the eventual transition from droplet to rivulet or continuous film regime is crucial for the prediction of ice accretion over the aircraft surface; absorption process through structured packing is also characterized by a thin film flowing over the corrugated sheets. Disjoining pressure together with the assumption of a thin precursor film is largely used in numerical simulations of thin films and moving droplets in order to model the dynamics of moving contact lines and the surface wettability properties, in terms of imposed static contact angle. The disjoining pressure model was largely validated in case of falling films with the well known Voinov-Hoffman-Tanner law. On the other side, the capability of the disjoining pressure to model the contact angle hysteresis, which is a crucial parameter for predicting moving droplets behavior, has not been discussed yet. Here, numerical simulations of both falling films and moving droplets under lubrication approximation are conducted and the disjoining pressure model is used to predict the contact line dynamics. After verification of the full curvature implementation for a 1D falling film, the effective contact angle hysteresis is estimated for a moving droplet under different flow conditions and the transition from droplet to rivulet regime detected.
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Singh, Lalit, Ritesh K. Tiwari, Shashi Verma e Vijay Sharma. "The Future of Artificial Intelligence in Pharmaceutical Product Formulation". Drug Delivery Letters 9, n. 4 (31 ottobre 2019): 277–85. http://dx.doi.org/10.2174/2210303109666190621144400.
Abstract (sommario):
Background: Conventional approach of formulating a new dosage form is a comprehensive task and uses various sources like man, money, time and experimental efforts. The use of AI can help to obtain optimized pharmaceutical formulation with desired (best) attributes. AI minimizes the use of resources and increases the understanding of impact, of independent variable over desired dependent responses/variables. Objective: Thus, the aim of present work is to explore the use of Artificial intelligence in designing pharmaceutical products as well as the manufacturing process to get the pharmaceutical product of desired attributes with ease. The review is presenting various aspects of Artificial intelligence like Quality by Design (QbD) & Design of Experiment (DoE) to confirm the quality profile of drug product, reduce interactions among the input variables for the optimization, modelization and various simulation tools used in pharmaceutical manufacturing (scale up and production). Conclusion: Hence, the use of QbD approach in Artificial intelligence is not only useful in understanding the products or process but also helps in building an excellent and economical pharmaceutical product.
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Flores, P., J. Ambrósio, J. C. P. Claro e H. M. Lankarani. "Dynamics of Multibody Systems With Spherical Clearance Joints". Journal of Computational and Nonlinear Dynamics 1, n. 3 (3 marzo 2006): 240–47. http://dx.doi.org/10.1115/1.2198877.
Abstract (sommario):
This work deals with a methodology to assess the influence of the spherical clearance joints in spatial multibody systems. The methodology is based on the Cartesian coordinates, with the dynamics of the joint elements modeled as impacting bodies and controlled by contact forces. The impacts and contacts are described by a continuous contact force model that accounts for geometric and mechanical characteristics of the contacting surfaces. The contact force is evaluated as function of the elastic pseudo-penetration between the impacting bodies, coupled with a nonlinear viscous-elastic factor representing the energy dissipation during the impact process. A spatial four-bar mechanism is used as an illustrative example and some numerical results are presented, with the efficiency of the developed methodology discussed in the process of their presentation. The results obtained show that the inclusion of clearance joints in the modelization of spatial multibody systems significantly influences the prediction of components’ position and drastically increases the peaks in acceleration and reaction moments at the joints. Moreover, the system’s response clearly tends to be nonperiodic when a clearance joint is included in the simulation.
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Loubet, L., P. G. Allinei, P. Schindler e V. Pointeau. "Implementation of three gamma measuring stations on the Colentec loop in Cadarache for the on line observation of the clogging phenomena in Steam Generator". EPJ Web of Conferences 225 (2020): 03011. http://dx.doi.org/10.1051/epjconf/202022503011.
Abstract (sommario):
The Tube Support Plate blockage, also named clogging, is a complex phenomenon that can occur in the steam generator of Pressurized Water Reactors. This deposit of iron oxides, that can reduce the coolant flux and constraint the primary tubes, could have significant consequences on heat exchanges and the integrity of the primary tubes. Since 2014, an experimental program carried out jointly by CEA-EDF, has been performed on a representative dedicated equipment, the COLENTEC loop at Cadarache. The physico-chemical properties of the deposit formed (chemical composition, thickness...) were determined at the end of each experimental campaign lead at thermohydraulic and chemical stable conditions. ... In order to determine the influence on clogging of parameters such as the chemistry, the temperature, the pressure in an on line process and without performing separate experimental campaigns, a method of measurement on radioactive tracer, the gamma emitter 59Fe, has been studied by our laboratory. First, a modelization with a monte carlo code, MCNP, has been carried out with the geometrical configuration of the Tube Support Plate zone of COLENTEC in order to determine the most adapted measuring station. These calculations had shown that a 30% efficiency, high purity, germanium detector, with a specific collimation would be able to detect the accumulation of 59Fe in the Tube Support Plate of COLENTEC. Then, in order to improve and ensure those important online measurements, our laboratory has proposed the installation of two additional measuring stations. One will be dedicated to a second on-line measurement, with a gamma detector of the same type, but positioned on a section of the loop remote from the previous area, to verify that there is no significant secondary deposit evolution elsewhere on the circuit. The last additional gamma measurement station will consist of a low background system able to carry out 59Fe concentration measurements of liquid samples taken from the loop during the test. This paper presents the context of this experiment and then focuses on the spectrometry measuring stations, modelizations and tests.
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Baglin, A., e Y. Lebreton. "Surface Abundances of Light Elements as Diagnostics of Transport Processes in the Sun and Solar-type stars". International Astronomical Union Colloquium 121 (1990): 437–48. http://dx.doi.org/10.1017/s0252921100068123.
Abstract (sommario):
AbstractObservations of the surface abundances of lithium, beryllium and helium-3 in the Sun and in solar-type stars of different ages should be interpreted in a coherent way. The abundance of lithium at the surface of a star decreases slowly with age; for stars of the same age it decreases with mass and a dependence on the rotation velocity is suggested. The solar surface lithium is depleted by a factor of 100 relative to the cosmic abundance while an He-3 enrichment of 15% at the solar surface during evolution is suggested.Observations favour the hypothesis of a slow transport process at work between the outer convective zone and the radiative interior of these stars. Orders of magnitude of the transport coefficient as well as its dependence upon the physical parameters can be inferred from surface abundances of light elements, but at the moment we are far from producing a completely consistent modelization.
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Mata, Francisco, Pedro Reis e J. Paulo Davim. "Physical Cutting Model of Polyamide Composites (PA66 GF30)". Materials Science Forum 514-516 (maggio 2006): 643–47. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.643.
Abstract (sommario):
Polymeric matrix composite materials presents advantages in a great number of applications due to their high specific strength and stiffness, wear resistance, dimensional stability, low weight and directional properties. As result of these properties and potentials applications exists a strong need to understand the manufacturing processes, particularly the machining process of these composite materials. This paper presents an investigation above the modelization of the cut, turning of small workpieces, on two materials: a polymer PA 6 (Polyamide) and a composite PA 66-GF30 (reinforced with 30% of glass fiber). The tests were carried out polycrystalline diamond tools (PCD). The objective of this experimental study is to evaluate the influence of the glass fiber reinforcement on the friction angle (ρ), shear angle (Φ), normal and shear stresses (σ, τ), chip deformation (ε) under the cutting parameters prefixed (cutting velocity and feed rate). The experimental model was compared with the theoretical model of Merchant.
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Orliac, Jean Guillaume, Adrien Charmetant, Fabrice Morestin, Philippe Boisse e Stephane Otin. "3D Interlock Composite Preforming Simulation". Key Engineering Materials 504-506 (febbraio 2012): 261–66. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.261.
Abstract (sommario):
In order to simulate 3D interlock composite reinforcement behavior in forming processes like Resin Transfer Molding (RTM), it is necessary to predict yarns positions in the fabric during the preforming stage of the process. The present paper deals about thick 3D interlock fabric forming simulation using a specific hexahedral semi-discrete finite elements simulation tool : Plast4. Using the virtual work principle, we distinguish the virtual internal work due to tensions in yarns from other internal virtual works. The part of material stiffness relative to yarns tension is described as "first order stiffness" by a 3D discrete beam model. The rest of the rigidities - like transverse compression, shear strains or friction between yarns - are depicted by a continuous quad-based discretization designated in our work as "second order stiffness". A combination of this "first order" discrete model and a continuous orthotropic hyperelastic "second order" material formulation will enables us to simulate interlock preforming process. Jointly to the simulation work, we also had to specify and perform experimental testing identification of material's parameters. Thoses parameters concern both parts of the model. A bilinear tension approach for the yarns discrete modelization and an orthotropic continuous material for the "second order" part.
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Kumar, Jatinder, e Ajay Bansal. "Photocatalytic degradation in annular reactor: Modelization and optimization using computational fluid dynamics (CFD) and response surface methodology (RSM)". Journal of Environmental Chemical Engineering 1, n. 3 (settembre 2013): 398–405. http://dx.doi.org/10.1016/j.jece.2013.06.002.
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Giordani, Gustavo, Domenico Scaramozzino, Ignacio Iturrioz, Giuseppe Lacidogna e Alberto Carpinteri. "Modal Analysis of the Lysozyme Protein Considering All-Atom and Coarse-Grained Finite Element Models". Applied Sciences 11, n. 2 (8 gennaio 2021): 547. http://dx.doi.org/10.3390/app11020547.
Abstract (sommario):
Proteins are the fundamental entities of several organic activities. They are essential for a broad range of tasks in a way that their shapes and folding processes are crucial to achieving proper biological functions. Low-frequency modes, generally associated with collective movements at terahertz (THz) and sub-terahertz frequencies, have been appointed as critical for the conformational processes of many proteins. Dynamic simulations, such as molecular dynamics, are vastly applied by biochemical researchers in this field. However, in the last years, proposals that define the protein as a simplified elastic macrostructure have shown appealing results when dealing with this type of problem. In this context, modal analysis based on different modelization techniques, i.e., considering both an all-atom (AA) and coarse-grained (CG) representation, is proposed to analyze the hen egg-white lysozyme. This work presents new considerations and conclusions compared to previous analyses. Experimental values for the B-factor, considering all the heavy atoms or only one representative point per amino acid, are used to evaluate the validity of the numerical solutions. In general terms, this comparison allows the assessment of the regional flexibility of the protein. Besides, the low computational requirements make this approach a quick method to extract the protein’s dynamic properties under scrutiny.
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Abdelhak, Lamreoua, Benslimane Anas, Bouchnaif Jamal e El Ouariachi Mostafa. "Optimized control of three-phase inverters to minimize total harmonic distortion in a grid-connected photovoltaic system". International Journal of Power Electronics and Drive Systems (IJPEDS) 13, n. 4 (1 dicembre 2022): 2255. http://dx.doi.org/10.11591/ijpeds.v13.i4.pp2255-2268.
Abstract (sommario):
Currently, the energy transfer process to the grid of the PV system is based on the importance of less harmonics and high efficiency. The evaluation of harmonics distortion of current is based on the value of THDi (<<5%), this last becomes very high if the current leakage is high, which causes losses of the grid and safety problems. Therefore, our job is to improve the classic control method of PV inverters used to reduce grid loss and improve electricity prices. This study is a proposal toward the modelization and improvement of the three-phase two-level, and multi-level photovoltaic (PV) inverter command, using space vector, and sinusoidal control based on controlling the active and reactive current delivered into the grid indirectly with a resonant controller (PIR) for a nonlinear load (NLL). The results of the simulations obtained by the new control methodology, SPWM, and SVPWM show that its performance is better compared with the simple modulation (PWM); the total harmonic distortion (THD) of current in both methods (SVPWM) and (SPWM) is better than that obtained with conventional commands. Also, multilevel converters control produces better quality waveforms, reducing current harmonic distortion.
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Selmaoui-Folcher, Nazha, Frédéric Flouvat, Dominique Gay e Isabelle Rouet. "Spatial Pattern Mining for Soil Erosion Characterization". International Journal of Agricultural and Environmental Information Systems 2, n. 2 (luglio 2011): 73–92. http://dx.doi.org/10.4018/jaeis.2011070105.
Abstract (sommario):
The protection and the maintenance of the exceptional environment of New Caledonia are major goals for this territory. Among environmental problems, erosion has a strong impact on terrestrial and coastal ecosystems. However, due to the volume of data and its complexity, assessment of hazard at a regional scale is time-consuming, costly and rarely updated. Therefore, understanding and predicting environmental phenomenons need advanced techniques of analysis and modelization. In order to improve the understanding of the erosion phenomenon, this paper proposes a spatial approach based on co-location mining and GIS. Considering a set of Boolean spatial features, the goal of co-location mining is to find subsets of features often located together. This system provides useful and interpretable knowledge based on a new interestingness measure for co-locations and a new visualization of the discovered knowledge. The interestingness measure better reflects the importance of a co-location for the experts, and is completely integrated in the mining process. The visualization approach is a simple, concise and intuitive representation of the co-locations that takes into consideration the spatial nature of the underlying objects and the experts practice.
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Rivet, Iván, Narges Dialami, Miguel Cervera, Michele Chiumenti, Guillermo Reyes e Marco A. Pérez. "Experimental, Computational, and Dimensional Analysis of the Mechanical Performance of Fused Filament Fabrication Parts". Polymers 13, n. 11 (27 maggio 2021): 1766. http://dx.doi.org/10.3390/polym13111766.
Abstract (sommario):
Process parameters in Additive Manufacturing (AM) are key factors in the mechanical performance of 3D-printed parts. In order to study their effect, a three-zone model based on the printing pattern was developed. This modelization distinguished three different zones of the 3D-printed part, namely cover, contour, and inner; each zone was treated as a different material. The cover and contour zones were characterized via uniaxial tensile tests and the inner zones via computational homogenization. The model was then validated by means of bending tests and their corresponding computational simulations. To reduce the number of required characterization experiments, a relationship between the raw and 3D-printed material was established by dimensional analysis. This allowed describing the mechanical properties of the printed part with a reduced set of the most influential non-dimensional relationships. The influence on the performance of the parts of inter-layer adhesion was also addressed in this work via the characterization of samples made of Polycarbonate Acrylonitrile Butadiene Styrene (ABS/PC), a polymeric material well known for its poor adhesion strength. It was concluded that by using this approach, the number of required testing configurations could be reduced by two thirds, which implies considerable cost savings.
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Xia, Linlin, Ruimin Liu, Daochang Zhang e Jingjing Zhang. "Polarized light-aided visual-inertial navigation system: global heading measurements and graph optimization-based multi-sensor fusion". Measurement Science and Technology 33, n. 5 (17 febbraio 2022): 055111. http://dx.doi.org/10.1088/1361-6501/ac4637.
Abstract (sommario):
Abstract Polarized skylight is as fundamental a constituent of passive navigation as the geomagnetic field. With regard to its applicability to outdoor robot localization, a polarized light-aided visual-inertial navigation system (VINS) modelization dedicated to globally optimized pose estimation and heading correction is constructed. The combined system follows typical visual simultaneous localization and mapping (SLAM) frameworks, and we propose a methodology to fuse global heading measurements with visual and inertial information in a graph optimization-based estimator. With ideas of‘adding new attributes of graph vertices and creating heading error-encoded constraint edges’, the heading, as the absolute orientation reference, is estimated by the Berry polarization model and continuously updated in a graph structure. The formulized graph optimization process for multi-sensor fusion is simultaneously provided. In terms of campus road experiments on the Bulldog-CX robot platform, the results are compared against purely stereo camera-dependent and VINS Fusion frameworks, revealing that our design is substantially more accurate than others with both locally and globally consistent position and attitude estimates. As a passive and tightly coupled navigation mode, the polarized light-aided VINS can therefore be considered as a tool candidate for a class of visual SLAM-based multi-sensor fusion.
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Ochando-Pulido, Javier Miguel. "Control systems for olive mill wastewater treatment with ultrafiltration and nanofiltration membrane in series based on the boundary flux theory". Water Science and Technology 76, n. 11 (23 agosto 2017): 2968–78. http://dx.doi.org/10.2166/wst.2017.444.
Abstract (sommario):
Abstract Proper membrane process design can be a difficult task to accomplish when fouling is present, and must be faced. Engineers usually consider the project variables concerning productivity and selectivity and follow these targets. However, in the presence of fouling, additional parameters must be considered, implying better knowledge of fouling phenomena. One possible solution to increase the reliability of a process is the use of stable control systems. This article reports a suitable method to reach this target, based on the boundary flux theory. The knowledge of the boundary flux values permits avoidance of high fouling operating conditions on a selected membrane. The goal here was to determine the framework for control of an ultrafiltration (UF) and nanofiltration (NF) batch membranes-in-series process treatment for olive mill wastewater, relying on these boundary flux points, which will thereafter serve for the automatic control of the process by an advanced control system. In this work, boundary flux values equal to 10 Lh−1m−2 for the UF membrane module and 14.3 Lh−1m−2 for the NF one were estimated. Moreover, the membrane constant permeability loss, measured by integrating the sub-boundary fouling index, was estimated to be reduced in the order of 65.4% for the NF membrane after the applied pretreatment and UF. This strategy permitted attaining stable and constant productivity for both membranes. Moreover, it is shown that, relying on the boundary flux modelization, both types of control systems (feed control and pressure control) could be used reliably. The proposed approach could help safely narrow the overdesign of membrane processes due to fouling issues and thus would have an impact on the reduction of the costs for both membrane processes.
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Sebayang, Ika Sari Damayanthi, e Muhammad Fahmia. "Dependable flow modeling in upper basin Citarum using multilayer perceptron backpropagation". International Journal of Artificial Intelligence Research 4, n. 2 (5 gennaio 2021): 75. http://dx.doi.org/10.29099/ijair.v4i2.174.
Abstract (sommario):
To determine the amount of dependable flow, a hydrological approach is needed where changes in rainfall become runoff. This diversification is a very complex hydrological phenomenon. Where this is a nonlinear process, with time changing and distributed separately. To approach this phenomenon, an analysis of the hydrological system has been developed using a model which is a simplification of the actual natural variables. The model is formed by a set of mathematical equations that reflect the behavior of parameters in hydrology. Modeling in this case uses artificial neural networks, multilayer perceptron combined with the backpropagation method is used to study the rainfall-runoff relationship and verify the model statistically based on the mean square error (MSE), Nash-Sutcliffe Efficiency (NSE) and correlation coefficient value (R2). Of the three models formed, model 3 provides optimum results with correlation levels using NSE per month as follows, in Cikapundung Sub-Basin NSE = 0,990703, R2 = 0,995008, and MSE = 0,00014443, while in Citarik Sub-Basin NSE = 0.9500, R2 = 0.97592, and MSE = 0.0010804 . From these results it can be seen that ANN has a fairly good ability to replicate random discharge fluctuations in the form of artificial models that have almost the same fluctuations and can also be applied in rainfall runoff modelization even though the results of the test results are not very accurate because there are still irregularities
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Baldo, Nicola, Evangelos Manthos e Marco Pasetto. "Analysis of the Mechanical Behaviour of Asphalt Concretes Using Artificial Neural Networks". Advances in Civil Engineering 2018 (12 luglio 2018): 1–17. http://dx.doi.org/10.1155/2018/1650945.
Abstract (sommario):
The current paper deals with the numerical prediction of the mechanical response of asphalt concretes for road pavements, using artificial neural networks (ANNs). The asphalt concrete mixes considered in this study have been prepared with a diabase aggregate skeleton and two different types of bitumen, namely, a conventional bituminous binder and a polymer-modified one. The asphalt concretes were produced both in a road materials laboratory and in an asphalt concrete production plant. The mechanical behaviour of the mixes was investigated in terms of Marshall stability, flow, quotient, and moreover by the stiffness modulus. The artificial neural networks used for the numerical analysis of the experimental data, of the feedforward type, were characterized by one hidden layer and 10 artificial neurons. The results have been extremely satisfactory, with coefficients of correlation in the testing phase within the range 0.98798–0.91024, depending on the considered model, thus demonstrating the feasibility to apply ANN modelization to predict the mechanical and performance response of the asphalt concretes investigated. Furthermore, a closed-form equation has been provided for each of the four ANN models developed, assuming as input parameters the production process, the bitumen type and content, the filler/bitumen ratio, and the volumetric properties of the mixes. Such equations allow any other researcher to predict the mechanical parameter of interest, within the framework of the present study.
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Papageorgiou, Loula, Patrick Van Dreden, Meletios A. Dimopoulos, Annette Larsen, Mohamad Mohty, Ismail Elalamy e Grigorios T. Gerotziafas. "Procoagulant Microparticles Derived from Myeloma Plasma Cells Have a Determinant Role in the Hypercoagulable State Associated with Multiple Myeloma. a Modelization in Vitro Study". Blood 134, Supplement_1 (13 novembre 2019): 2425. http://dx.doi.org/10.1182/blood-2019-124650.
Abstract (sommario):
Background: Multiple myeloma (MM) is a plasma cell malignancy characterized by bone marrow infiltration leading to multiple lytic bone lesions, renal failure, anemia and increased rate of thrombotic events. The cross-talk between cancer cells, plasma clotting mechanism, platelets and endothelial cells enhances hypercoagulability. The mechanisms by which myeloma plasma cells (MPCs) interfere with their microenvironment during the blood coagulation process have been poorly investigated. Several studies have established a link between levels of cancer cell derived procoagulant microparticles, cancer aggressiveness, response to anticancer treatments well as with the risk of cancer associated thrombosis., The mechanisms by which myeloma plasma cells interfere to blood coagulation process in their microenvironment have been poorly investigated. Aim: Set up an experimental model that allows the identification of the procoagulant fingerprint of MPCs and myeloma cell-derived microparticles (MC-dMPs) as well as their impact on thrombin generation of normal plasma. In addition, we evaluated the relative impact of TF-pathway and the intrinsic clotting pathway on thrombin generation triggered by myeloma plasma cells and MC-dMPs. Finally, we performed a simulation of thrombin generation process in the presence of myeloma plasma cells and MC-dMPs as well as in the presence of varying concentrations of TF and procoagulant phopsholipids, mimicking some of the conditions that potentially exist in MPCs. Methods. TF and annexin V expression by MPCs (MPC-dMPs) were analyzed by flow cytometry, TF activity (TFa) and TF gene expression was also determined. Thrombin Generation (TG) in the presence of MPCs or MPC-dMPs was assessed with the Calibrated Automated Thrombogram assay (CAT®) in normal human PPP. TG was also assessed in plasma spiked with MPCs and MPC-dMPs or variable concentrations of TF and procoagulant phospholipids. Results: MPC-dMPs expressed about 8-fold higher levels of TF as compared to MPCs. TFa expressed by MPC- dMPs was significantly higher as compared to that expressed by MPC cells. MPCs and PC- dMPs enhanced thrombin generation of human plasma. Thrombin generation was significantly higher with MPC-dMPs compared to MPCs. MPCs and MPC-dMPs, when concomitantly present in normal PPP, significantly amplified thrombin generation as compared to that observed in the presence of MPCs alone. Presence of TF and procoagulant phospholipids in the microenvironment resulted in significant amplification of thrombin generation induced by MPCs. Conclusion: This study support the concept that hypercoagulability induced by myeloma plasma cells is the result of the combination of the procoagulant properties of myeloma cells with the procoagulant elements of the plasma microenvironment which consist of procoagulant phospholipids and low TF concentration. Following this concept we assume that MPC-dMPs released by myeloma plasma cells into the microenvironment enhance the weak procoagulant activity of myeloma plasma cells. Whereas this combined effect of MPCs and MPC-dMPs on thrombin generation has an impact on the formation of local fibrin network their critical role into the hypercoagulablity, procoagulant MC-dMP could be a potential target for the evaluation of the aggressivity of MPCs and of their response to anti-myeloma treatment. Disclosures Dimopoulos: Sanofi Oncology: Research Funding. Mohty:Jazz Pharmaceuticals: Honoraria, Research Funding. Elalamy:Pfizer: Honoraria, Research Funding; BMS: Honoraria, Research Funding; Boehringer-Ingelheim: Honoraria, Research Funding; Sanofi: Honoraria, Research Funding; LEO Pharma: Honoraria, Research Funding; Aspen: Honoraria, Research Funding; Bayer Healthcare: Honoraria, Research Funding.
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Chiesa, P., G. Lozza, E. Macchi e S. Consonni. "An Assessment of the Thermodynamic Performance of Mixed Gas–Steam Cycles: Part B—Water-Injected and HAT Cycles". Journal of Engineering for Gas Turbines and Power 117, n. 3 (1 luglio 1995): 499–508. http://dx.doi.org/10.1115/1.2814123.
Abstract (sommario):
Part B of this paper focuses on intercooled recuperated cycles where water is injected to improve both efficiency and power output. This concept is investigated for two basic cycle configurations: a Recuperated Water Injected (RWI) cycle, where water is simply injected downstream of the HP compressor, and a Humid Air Turbine (HAT) cycle, where air/water mixing is accomplished in a countercurrent heat/mass transfer column called “saturator,” For both configurations we discuss the selection and the optimization of the main cycle parameters, and track the variations of efficiency and specific work with overall gas turbine pressure ratio and turbine inlet temperature (TIT). TIT can vary to take advantage of lower gas turbine coolant temperatures, but only within the capabilities of current technology. For HAT cycles we also address the modelization of the saturator and the sensitivity to the most crucial characteristics of novel components (temperature differences and pressure drops in heat/mass transfer equipment). The efficiency penalties associated with each process are evaluated by a second-law analysis, which also includes the cycles considered in Part A. For any given TIT in the range considered (1250 to 1500°C), the more reversible air/water mixing mechanism realized in the saturator allows HAT cycles to achieve efficiencies about 2 percentage points higher than those of RWI cycles: At the TIT of 1500°C made possible by intercooling, state-of-the-art aero-engines embodying the above-mentioned cycle modifications can reach net electrical efficiencies of about 57 and 55 percent, respectively. This compares to efficiencies slightly below 56 percent achievable by combined cycles based upon large-scale heavy-duty machines with TIT = 1280°C.
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Chiesa, P., e G. Lozza. "CO2 Emission Abatement in IGCC Power Plants by Semiclosed Cycles: Part A—With Oxygen-Blown Combustion". Journal of Engineering for Gas Turbines and Power 121, n. 4 (1 ottobre 1999): 635–41. http://dx.doi.org/10.1115/1.2818519.
Abstract (sommario):
This paper analyzes the fundamentals of IGCC power plants where carbon dioxide produced by syngas combustion can be removed, liquefied and eventually disposed, to limit the environmental problems due to the “greenhouse effect.” To achieve this goal, a semiclosed-loop gas turbine cycle using an highly-enriched CO2 mixture as working fluid was adopted. As the oxidizer, syngas combustion utilizes oxygen produced by an air separation unit. Combustion gases mainly consists of CO2 and H2O: after expansion, heat recovery and water condensation, a part of the exhausts, highly concentrated in CO2, can be easily extracted, compressed and liquefied for storage or disposal. A detailed discussion about the configuration and the thermodynamic performance of these plants is the aim of the paper. Proper attention was paid to: (i) the modelization of the gasification section and of its integration with the power cycle, (ii) the optimization of the pressure ratio due the change of the cycle working fluid, (iii) the calculation of the power consumption of the “auxiliary” equipment, including the compression train of the separated CO2 and the air separation unit. The resulting overall efficiency is in the 38–39 percent range, with status-of-the-art gas turbine technology, but resorting to a substantially higher pressure ratio. The extent of modifications to the gas turbine engine, with respect to commercial units, was therefore discussed. Relevant modifications are needed, but not involving changes in the technology. A second plant scheme will be considered in the second part of the paper, using air for syngas combustion and a physical absorption process to separate CO2 from nitrogen-rich exhausts. A comparison between the two options will be addressed there.
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Forrat, Rémi, Rafaele Dumas, Michael Seiberling, Michael Merz, Charles Lutsch e Jean Lang. "Evaluation of the Safety and Pharmacokinetic Profile of a New, Pasteurized, Human Tetanus Immunoglobulin Administered as Sham, Postexposure Prophylaxis of Tetanus". Antimicrobial Agents and Chemotherapy 42, n. 2 (1 febbraio 1998): 298–305. http://dx.doi.org/10.1128/aac.42.2.298.
Abstract (sommario):
ABSTRACT In a monocentric, double-blind, randomized trial, we examined the safety and pharmacokinetic profile of a new, pasteurized, human tetanus immunoglobulin (P-HTIG). As part of the purification process, P-HTIG has undergone a heat treatment step (10 h at 60°C) and the removal of Merthiolate. Forty-eight adults with a history of tetanus vaccination were randomized into four groups (n = 12 per group) to receive one of two different batches of this P-HTIG simultaneously with either tetanus-diphtheria (Td) vaccine (sham, postexposure prophylaxis of tetanus) or placebo. Local reactions at the injection site were followed for the first 3 days after injection, and systemic reactions were followed during the entire study period, i.e., up to 42 days posttreatment. Blood samples for tetanus antibody titer determination (enzyme-linked immunosorbent assay method) were drawn prior to treatment on day 0 and on days 1, 2, 3, 7, 14, 21, 28, 35, and 42. A normalization of tetanus antibody titers (subtraction of the day 0 value for each subject at each time period) was performed to assess the additive effect of P-HTIG on tetanus antibody titers. The pharmacokinetic parameters were determined by both a compartmental analysis (modelization) and a noncompartmental analysis. No severe adverse reactions were reported. The rate of local reactions at the P-HTIG injection site was 27%. All local reactions were mild and resolved within 2 days. In contrast, local reactions at the vaccine injection site were seen in 79% of the subjects. The rate of systemic reactions was similar in the P-HTIG plus Td vaccine group (33%) and in the P-HTIG plus placebo group (21%), and all these reactions were mild. In the P-HTIG plus placebo group, tetanus antibody titers rose to a maximum of 0.313 ± 2.49 IU/ml after 4.4 days; in the P-HTIG plus Td vaccine group, a maximum concentration of 15.2 ± 2.42 IU/ml was reached 19 days postinjection. In both groups, 100% of the patients had seroprotective levels of tetanus antibodies (≥0.01 IU/ml) 2 days following treatment. An anamnestic response to Td vaccine appeared 7 days postimmunization. In conclusion, P-HTIG has a good safety and pharmacokinetic profile. Our results confirm that immunoglobulin should be associated with vaccine in the treatment of tetanus-prone wounds.
34
Mailhé, D., F. Lucazeau e G. Vasseur. "Uplift history of thrust belts: An approach based on fission track data and thermal modelization". Tectonophysics 124, n. 1-2 (aprile 1986): 177–91. http://dx.doi.org/10.1016/0040-1951(86)90144-7.
35
Vigil, A. A., C. G. Nicieza, M. A. Rodriguez e A. Menendez. "Modelization of methane development in vertical coal seam exploited by sublevel stoping method". International Journal of Surface Mining, Reclamation and Environment 10, n. 1 (gennaio 1996): 31–40. http://dx.doi.org/10.1080/09208119608964792.
36
Chen, Lin, Tomohiro Suzuki, Taku Nonomura e Keisuke Asai. "Characterization of luminescent mini-tufts in quantitative flow visualization experiments: Surface flow analysis and modelization". Experimental Thermal and Fluid Science 103 (maggio 2019): 406–17. http://dx.doi.org/10.1016/j.expthermflusci.2019.02.002.
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Laperrière, Vincent. "Un cadre de modélisation dynamique multiniveau pour la peste bubonique des Hautes Terres de Madagascar (A framework for multilevel dynamic modelization of bubonic plague in the Madagascar Highlands)". Bulletin de l'Association de géographes français 89, n. 2 (2012): 278–88. http://dx.doi.org/10.3406/bagf.2012.8266.
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Rapoport, Diego Lucio. "Torsion Geometry 5-Fold Symmetry, Anholonomic Phases, Klein Bottle Logophysics, Chaos, Resonance: Applications Towards a Novel Paradigm for the Neurosciences and Consciousness". Journal of Physics: Conference Series 2482, n. 1 (1 maggio 2023): 012026. http://dx.doi.org/10.1088/1742-6596/2482/1/012026.
Abstract (sommario):
Abstract We discuss the torsion geometries as the universal dynamical setting for the five-fold symmetry and its relation to nonorientable surfaces of selfreference embodying a supradual logophysics, rooted in the Möbius strip and Klein Bottle. We frame the discussion in terms of image-schemas in cognitive semantics and their disruption stemming from supraduality and nonorientability. We present the relation with anholonomic phases, chaos and the brain-mind as an integrated dynamical system. We discuss nonorientability as the characteristic transcendental metapattern of resonant connection, pattern formation and recognition. We present the torsion geometry and nonorientability in psychophysics and the neurosciences. We discuss the homology of the torsion geometry of physical space or spacetime with that of the unconscious modelization by the brain-mind of the kinematics of objects in physical space and in the perception of music, elaborating on the Principle of Complementarity of cognitive psychology due to Shepard. We elaborate on the phenomenological construal of experience, the world as experience. We discuss the supraduality of the liminal states of consciousness and the basis of awareness in memory. We introduce the cognitive psychology foundations of memory on nonorientability and its relations to the short-memory space and its quantumlike nature, and the hyperbolicity of the psychophysics of vision. We discuss the chaotic behaviour of dynamical systems as a manifestation of supraduality as their nonorientability. We propose a basis for the source of consciousness, the Hard Problem, given by the principles of selfreference and hetero-reference which generate the Klein Bottle supradual logophysics. We present the supradual logophysics of neuron cytoskeletal structures, its relation to torsion, resonances, topological and geometrical phases and the microtubule dynamics in terms of nonlinear buckling patterns and nonorientability, and still the torsion geometry of the irreversible thermodynamical processes supporting interactions-at-a-distance. We discuss the primal relation of torsion, nonorientability and memory, particularly arising in the buckling of microtubules. We discuss the primal morphogenesis of the cell as a tensegrity structure, torsion and the indiscernibility of elastodynamics, electromagnetic and gravitational wavefronts as morphogenetic fields. We discuss nonorientability as the metaform pattern of connection and resonance, particularly of interaction-at-a-distance. We apply it to a topological allosteric effect mediated by electromagnetic fields. We discuss the topological chemistry paradigm, particularly of organic chemistry where conformation superposition is crucial, its relation to anaesthetics and its application to the ORC OR theory of Penrose and Hameroff for consciousness as arising from the collapse of the wave function which we relate to the multiconformation in the topological chemistry paradigm. We propose a model of continuous signal processing in digital terms which allows an optimal reconstruction -from digital to continuous-in terms of the Nyquist-Shannon theorem whose constraints on frequencies and bandwidths is naturally interpreted in the terms of the 2:1 harmonics of nonorientability in the Möbius strip or Klein Bottle. We discuss the non-dual logic of the tubulin code and the resonator nature of the neuronal cytoskeleton. We propose that the topological phases appearing in the cytoskeleton may correspond to the topological anholonomity, namely, nonorientability, as was elicited empirically by the Bandyopadhyay group, the existence of anholonomity corresponding to the 360° rotation characteristic of the topological anholonomity, Möbius strip. We propose the Matrix Logic representation of the Klein Bottle logic as the basis for microtubule computations, and discuss the relation to quantum computation, topological entanglement and the topological coherence/decoherence Klein Bottle cycle. We also relate it to holography, the brain’s integration and Velmans’ Reflexive Monism extended by Rapoport. We discuss the multiconformation orientable and nonorientable resonators electronic devices and antennas as classical-quantum realisations of microtubule coherent behaviour. We discuss the relation of life and consciousness and the topological nonorientable embodiment of memory. We introduce the dynamical reduction program for the collapse of the quantum state in terms of the torsion stochastic differential geometry of the quantum geometry of Quantum Mechanics as projective space, and particularly the stochastic extension of the Schroedinger equation to account for the coupling of quantum system and environment, say a measurement apparatus. Thus we identify a realisation of the dynamical reduction program which is based on the torsion geometry, yet supports an agent-free collapse of the quantum state, as an objective albeit random process due to quantum fluctuations. We shall discuss the present supradual logophysics in several aspects such as 1) microtubule structure and dynamics, 2) the orientable and nonorientable conformations of organic molecules, 3) the relation with anaesthetics and the altered states of consciousness and 4) confront them with the tenets of Penrose & Hameroff ORC OR theory for the origin of consciousness, not only the topological chemistry but their choice of a superposition of null torsion as in General Relativity, which renders a trivial selfreferentiality, with the topological chemistry multiconformations which requires non-null torsion. The nontrivial selfreferentiality is both proper to the mind and the torsion geometry, be that on the physical, chemical, perceptual or cognitive domains. All in all, we propose that consciousness is neither based on panpsychism nor the collapse of quantum states, nor exclusively on the control of superposition of conformations of organic chemistry, but rather on the torsion-nonorientable geometry-topology based on the principles of selfreference and hetero-reference, operating in all domains: that of meaning, the mental-anatomical-physiological domain, structural processes of matter energy and in-formation, be that physical, chemical, biological, cognitive and perception. We present a remarkable connection between them. Our approach rather than multidisciplinary will be transdisciplinary, a possibility supported on supraduality - transcending the dual-logic based logophysics-from which the theory will follow in a rather smooth way.
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Perez-Bernabeu, E., M. A. Selles, S. Sanchez-Caballero, D. Juarez e J. E. Crespo. "MODELIZATION OF IRONING PROCESS. APPLICATION TO A THREE-LAYERED POLYMER COATED STEEL." ANNALS OF THE ORADEA UNIVERSITY. Fascicle of Management and Technological Engineering. XX (X), 2011/2, n. 2 (2011). http://dx.doi.org/10.15660/auofmte.2011-2.2245.
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Chrifi Ibtissam, Tace Elmostafa, Radid Mohamed e Yazza Younes. "Modelization of the Personal Learning Environment in the Moroccan Higher Education". Iraqi Journal of Science, 14 gennaio 2021, 300–304. http://dx.doi.org/10.24996/ijs.2021.si.1.41.
Abstract (sommario):
Any research focusing on the teaching-learning process must focus on the learner, by mobilizing the various devices to facilitate and optimize learning. In this context, we introduce the integration of educational technologies into a personal learning environment (PLE). The PLE has significant potential for learning; namely self-construction and self-management of knowledge. According to Attwel (2007b), the development and improvement of PLE will lead to drastic changes in the way we use educational technology, as well as in the organization and ethics of education. With the present contribution, we try to modelize the PLE of students within institutions of higher education in Morocco. Based on data from a questionnaire put online using google forms, we have found that digital devices are ubiquitous in the daily lives of learners, but their practices are limited to distracting uses, and that the institutional framework remains more basic to manage their learning. The purpose of this study is to develop learning autonomy and to improve the way of using technologies through our student’s conception of the PLE.
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Borgonovi, Fausto. "PROCEDIMENTI DI MISURAZIONE, PREDICIBILITA' E DETERMINISMO NELLE LEGGI DELLA FISICA". Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio, 18 novembre 2013, 103–11. http://dx.doi.org/10.4081/incontri.2008.52.
Abstract (sommario):
Riassunto. – I dati finanziari e la realtà fisica vengono descritti mediante modelli matematici. Mentre ciò sembra del tutto ovvio per i fenomeni naturali (alla luce dei molti e importanti progressi compiuti nella fisica dell’ultimo secolo), la questione della modellizzazione matematica dei dati economico-finanziari è ancora oggetto di dibattito. In particolare, il problema della prevedibilità di alcuni eventi viene qui discussa e si stabilisce la sua relazione con un processo presunto di misurazione oggettiva.***Abstract. – Financial data and physical reality are described in terms of mathematical models. While this seems quite obvious for the natural phenomena (in the light of the many and important progress done in the last century physics), the question of the mathematical modelization of the former is still under debate. In particular, the problem of the predictability of some event is discussed and its relationship with a presumed objective measurement process established.
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S., KHERICI. "COOLING PROFILE OF POTASSIUM HYDROGEN TARTRATE BATCH CRYSTALLIZATION". Engineering and Technology Journal 07, n. 06 (30 giugno 2022). http://dx.doi.org/10.47191//etj/v7i6.09.
Abstract (sommario):
Batch crystallization is an important chemical unit operation. So, large numbers of published works were focused on batch crystallization modelization, simulation, optimization, control and parameter estimation. In this work, an optimization is made with the objective to obtain the optimal cooling temperature strategy of a batch crystallizer realized in our laboratory. The potassium hydrogenotartarate (cream of tartar) subject of our study is recovered from wine tartar, a solid byproduct of winemaking, using batch cooling crystallization. To determine the optimum cooling temperature profile with a maximum yield of cream of tartar, we used coupled population, material and energy balance model. This model can describe the dynamics of the batch crystallization process. Based on this model, an optimal cooling temperature profile is calculated, using method of moments and the solubility data of cream tartar in water
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Djiobie Tchienou, Gertrude Eléonore, Roli Karole Tsatsop Tsague, Séléstin Dongmo Sokeng e Martin Benoît Ngassoum. "Kinetic study in the extraction of xanthones from Securidaca longepedunculata roots by microwave-assisted-extraction". Beni-Suef University Journal of Basic and Applied Sciences 11, n. 1 (23 settembre 2022). http://dx.doi.org/10.1186/s43088-022-00298-w.
Abstract (sommario):
Abstract Background Extraction of active compounds from plants using microwave can be utilized as an alternative solution for conventional extraction. To well understand this technology, the study of the modelization and kinetics mechanism of the extraction method is necessary. This study aimed to evaluate the suitable kinetics models for MAE of the Xanthones from Securidaca longepedunculata Fresen roots. Results The experimental data (xanthones versus time, power and ratio, respectively) were fitted to three-parameter empirical kinetics models. The second-order models appear to be the best fit to explain kinetics study of MAE than the first model. The second-order model was acceptable, with elevated value of the correlation coefficient (R2 = 0.9861), showing that it perfectly relates the process. Conclusion Based on the results obtained, the extraction of xanthones from roots of S. longepedunculata is done successively in two steps, washing and diffusion of compounds from matrices as described by second-order kinetics model. The latter could report the kinetics model of extraction process from S. longepedunculata Fresen using microwave technology.
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Gozé, Tudi. "How to Teach/Learn Praecox Feeling? Through Phenomenology to Medical Education". Frontiers in Psychiatry 13 (18 marzo 2022). http://dx.doi.org/10.3389/fpsyt.2022.819305.
Abstract (sommario):
BackgroundThe Praecox Feeling (PF) refers to a classical psychopathological concept describing the specific experience of bizarreness arising in the encounter with a person living with schizophrenia spectrum disorders (SSDs). Some studies have shown that experienced psychiatrists take advantage of this experience to perform accurate and rapid diagnostic expertise. It would seem that PF is not contradictory with an operationalized diagnostic approach, but that the PF would intervene at a more tacit level of medical judgment. However, the articulation between the implicit and explicit levels of the psychiatrist's experience in the situation of medical judgment remains little studied, even though it is of crucial importance for structuring the teaching of clinical psychiatry to mental health practitioners. Can diagnostic intuition be learned? Is this experience a kind of “gift” that some may or may not have? Does the PF refer to medical expertise?MethodsTo unfold the complexity of his questions this article proposes to conduct an historical, epistemological and phenomenological analysis of the PF.ResultsWe will first conduct a presentation of historical descriptions of the PF understood as a sensation, intuition and experience, alongside the evolution of the concept of schizophrenia. Then, the article proposes an original phenomenological modelization of the temporal unfolding of the PF.DiscussionThe phenomenological conceptualization, informed from empirical evidence will try to account for the paradox of the PF as both lived evidence and indescribable experience. PF will be described as a complex cognitive and embodied process based upon ante-predicative aesthetic sensing which is secondly apprehended as perceptible evidence thanks to clinical typification. This conceptualization relying on Husserl manuscript on intersubjectivity will help to demystify its experiential structure and discuss its relevance for medical education.
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Ha, Mai, e Nguyen Van Hoa. "The Role of Intangible Assets of Scientific Research Human Resources". VNU Journal of Science: Policy and Management Studies 37, n. 1 (24 marzo 2021). http://dx.doi.org/10.25073/2588-1116/vnupam.4283.
Abstract (sommario):
The article provides analysis of the scientific concepts and contents related to the intangible assets of scientific research human resources. With scientific arguments, the author gives his views to the important role of intangible assets of science and technology human resources in general and scientific research human resources in particular. In the process of designing policies for development of science and technology human resource, policy makers should take into account the intangible assets of scientific research human resources to create an adequate environment for scientific creative labor and to provide right assessments of the value of creative work in research and development activities.
Keywords
Intangible asset, scientific research, development policy, scientific creative work, scientific research human resource, innovation.
References
[1] M. Ha, H.V. Tuyen, D.T. Truong, Science and Technology Enterprises: From the Theory to Practice, ISBN 978-604-67-0481-2, Science and Technics Publishing House, Ha Noi, Vietnam, 2015 (in Vietnamese)[2] M. Ha, Innovation and Scientificiy of the term “innovation” in the sence of “innovation” in policy research in Vietnam The Sc. Journal of Sociology. ISSN 2615-9163, 3 (147) (2019) 3-10 (in Vietnamese).[3] OECD, Guidelines for Collecting and Reporting Data on Research and Experimental Development, Frascati Manual, 2005.[4] M. Ha, Specific Particularities of S&T Research Labor Sc. Journal of S&T Policy and Management, ISSN 1859-3801, 1(1) (2011) 4-10 (in Vietnamese).[5] M. Ha (Key Editor), Q&A on Industrialization and Modelization, Youth Publishing House, Ha Noi, 1997 (in Vietnamese),[6] M. Ha, The Role of Intelligensia in Economic Development and International Integration (in Vietnamese). Journal of Science: Policy and Management Studies. ISSN 0866-8612, 31(1) (2015).
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RODRÍGUEZ, Fernando Gabriel. "SEMIÓTICA Y VERDAD: LA REALIDAD DEL SIGNO DESDE LA PSICOLOGÍA DEL DESARROLLO". Signa: Revista de la Asociación Española de Semiótica, 9 gennaio 2022, 697–716. http://dx.doi.org/10.5944/signa.vol31.2022.29462.
Abstract (sommario):
La relación entre significación y verdad ha sido, para algunas tradiciones, una marca definitoria del hecho semiótico. Este planteo vale tanto para abordajes lógico-epistémicos, atentos especialmente a la noción de referencia, como para modelizaciones desde la noción de lengua saussureana, concentradas en el mecanismo sígnico (respectivamente, referencialistas y significacionistas). Junto con ello, los dos tipos de abordaje, el primero trabajando desde la proposición, el segundo desde las oposiciones del nivel significante, conciben esencialmente la semiosis desde la matriz lingüística, y ambos convergen finalmente en pensar la verdad como un problema de coherencia interna. Se analizan ambas tradiciones, mostrando sus puntos de afinidad y divergencia, y con apoyo en la psicología del desarrollo de la infancia temprana se objeta que el nexo entre procesos de semiosis y de cognición puede entenderse como originario. En consecuencia, se discute que la semiótica como disciplina deba plantearse límites en términos veritativos o epistémicos. Abstract: The relationship between meaning and truth has been, for some traditions, a defining mark of the semiotic fact. This is valid both for logical-epistemic approaches, paying special attention to the notion of reference, and for modelizations based on Saussure's notion of langue, centered on the signification mechanism (respectively, referentialists and significationists). Together with this, the two types of approach, the first working from the proposition, the second from the oppositions of the signifying level, essentially conceive the semiosis from the linguistic matrix, and both finally converge in thinking the truth as a problem of internal coherence. Both traditions are analyzed, showing their points of affinity and divergence, and with support in the psychology of early childhood development it is objected that the nexus between semiotic processes and cognition can be understood as original. Consequently, it is discussed that semiotics as a discipline should be delimited by truth or epistemic terms.