Induction heat treatment of large rolls with two independent power sources

The two-inductor heat treatment system for rolls of rolling mills is highly flexible and can improve the quality of heat treatment while solving energy-efficiency and productivity problems. A digital model of induction heat treatment of rolls with the computation of electromagnetic, temperature and stress fields is developed taking into account the characteristics of power supplies and control systems for heat treatment modes. Particular attention is paid to the reliability of frequency converters in the presence of magnetic coupling between inductors. Recommendations on frequency selection and inverter settings are given. A universal method of digital design and control of thermal conditions in induction heat treatment systems is considered

Advanced Induction Heat Treatment Systems of Pipes

New approach of designing and control of induction heat treatment installations of pipes with utilizing of numerical models is developed. Models include two- dimensional simulation of coupling electromagnetic and temperature fields in cylindrical systems for processing of pipes. Also, thermal and structural tension during heating and cooling of pipes are simulated. These data allow defining structure, hardness, the size of grain and other properties of the pipes. They allow optimizing design and a choice of equipment, a heat treatment mode for achievement of the maximum quality and minimization of energy consumption. The developed models were used not only for the design of induction heat treatment systems of pipes and rolls, but also for a digital control of these complexe

Synthesis and spectral properties of 4-amino- and 4-acetylamino-N-arylnaphthalimides containing electron-donating groups in the N-aryl substituent

A method for the synthesis of N-aryl-substituted 4 amino- and 4-acetylaminonaphthalimide derivatives with mono- and dialkoxy groups or a 15-crow-5 moiety in the N-aryl substituent is described. The introduction of electron-donating alkoxy groups into the benzene ring of the N-aryl fragment results in fluorescence quenching of the naphthalimide chromophore, which is most pronounced in the spectra of N-acetyl derivatives. The photophysical properties of the synthesized 4-amino- and 4-acetylaminonaphthalimides depend on the solvent polarity and its specific solvating ability due to H-bonding. The crown containing compounds are promising fluorescent chemosensors for metal cations

Cation-Dependent Fluorescent Properties of Naphthalimide Derivatives with N-Benzocrown Ether Fragment

The investigation of N-phenyl-4-amino- and N-phenyl 4-acetamido-1,8-naphthalimides containing N-benzo- 15-crown-5 ether substituent showed that the presence of ionophoric fragment as N-substituent in naphthalimide molecule provides the design of compound possessing the properties of fluorescent receptor. The addition of metal cations does not change the position of absorption and emission bands but substantial increases the fluorescence intensity. The study of molecules included the theoretical and experimental (optical, NMR) methods, analysis of intramolecular charge (electron) transfer and fluorescence properties in the presence and absence of metal ions