The features of modelling semiconductor lasers with a wide contact

The aspects of calculating the dynamics and statics of powerful semiconductor laser diodes radiation are investigated. It takes into account the main physical mechanisms influencing power, spectral composition, far and near field of laser radiation. It outlines a dynamic distributed model of a semiconductor laser with a wide contact and possible algorithms for its implementation

Fertilizer influence on the productivity of cereal-grass crop rotation and fertility of sod-podzolic light loamy soil

The application of complete organic-mineral fertilizer (N36P60K130 on the background of 8 t/ha manure) has provided a cereal-grass crop rotation productivity of 9.31 c/ha f. u. when the content of humus, phosphorus and potassium in the plough horizon on sod-podzolic light loamy soil is increased. The removal of nitrogen, phosphorus or potassium reduced the crop rotation productivity when the content of mobile phosphorus and potassium compounds in soils was decreased

Synthesis and characterization of fluorinated poly(azomethine ether)s from new core-fluorinated azomethine-containing monomers

<div><p></p><p>In this work, we describe the design and synthesis of novel core-fluorinated Schiff base monomers and conjugated polymers based on them. The new fully aromatic highly fluorinated poly(azomethine ether)s (PAMEs) were prepared by polycondensation of core-fluorinated azomethine-containing compounds. The structure of the monomers and polymers were confirmed by FTIR, ¹H, ¹³C, and ¹⁹F NMR spectroscopic analysis. The influence of synthesis condition on the properties of PAME compounds was investigated. Application of polarization microscopy with a temperature control thermal stage revealed thermotropic liquid crystalline (LC) behavior in the synthesized materials. Transition temperatures and a range of the existence of the LC phase were studied by a combination of the optical microscopy and DSC analysis. According to the TGA analysis, all the synthesized PAMEs show high thermal stability and thus offer a wide range of thermal processibility (up to 410–477 °C), which makes them prospective materials for many modern applications.</p></div