The analysis of the functioning of the brain allows to propose a computational model of multilayer artificial neural network susceptible of associating some response to a particular input, so that when we present that input, we get the required output by the stability of its states and by minimizing the function of energy of the network. The problem of explosion in the number of interconnections has been solved by the introduction of a layer between the input and the output layer of the network. In this paper, we propose the adaptive bidirectional associative memory by conjugate gradient algorithm, so as to study the behavior and performances of the network on pairs of patterns through using the autoassociative or heteroassociative memories. 相似文献
Analytical modelling, controller design and simulation of an air-to-air runaround coil heat recovery system are studied. The system consists of two plate-fin-tube coils, a storage tank, two circulating pumps, an auxiliary heater and associated distribution network. Simulation results showing the transient response characteristics of the open-loop and closed-loop system are given. Results show that the designed controllers are able to hold the preheat temperature and the storage tank temperature at their respective setpoints irrespective of changes in outdoor and exhaust (source heat) temperatures. 相似文献
Infrared spectra of peroxyformic acid (HCOOOH) and the six isotopic modifications H13COOOH, HC18OOOH, DCOOOH, HCOOOD, H13COOOD, DCOOOD have been recorded in an argon matrix in the spectral range 200–4000 cm−1. Assignments of the observed absorption lines are presented for the available isotopic species. All fundamental vibrations except one have been identified. A general valence force field has been determined based on the measured vibrational frequencies and on an ab initio MP2/6-31G** force field. 相似文献
Recent studies have proposed that the high-valent iron species (such as FeIVO2+) rather than sulfate radical (SO4??) and hydroxyl radical (?OH) are the main reactive oxidant species (ROS) in Fe(II)/peroxydisulfate (PDS) system with the methyl phenyl sulfoxide (PMSO) as the FeIVO2+ probe. However, many operational factors may interfere with the accuracy of this method, so the contribution of FeIVO2+ calculated by this method is controversial. In this study, the possible effect of Fe(II) concentration, pollutant type, reducing agent, or coexisted anions on FeIVO2+ production and its corresponding contribution to the removal of target pollutants in the Fe(II)/PDS system were investigated in detail, and the intrinsic mechanisms involved were also explored. This study shows that ROS generation is a complex process in the Fe(II)/PDS system, and multiple combinatorial approaches are urgently required to deeply explore the contribution of ROS to the elimination of target contaminants. 相似文献
Electrophilic aromatic substitution (EAS) is a critical chemical reaction in organic chemistry in which electrophiles reagents is normally required. Recently, a study published by Yaping Zang and colleagues in Nature Communications demonstrates the use of an electric field as a catalyst to regulate EAS reactivity, replacing conventional chemical reagents. The research team discovered that an electric field could activate an otherwise unreactive electrophile and break inert nonpolar C-C bonds under mild conditions. These unprecedented results showcase the potential for broadening the scope of EAS reactions via electric field catalysis.
