Measurements of the temperature of the walls of composite pipes during thermal processing in travelling - wave microwave systems
A design is proposed for microwave systems which produce a uniform temperature distribution over the transverse cross section of dielectric pipes. A method for calculating the temperature distribution over the thickness of pipes made of composite materials is examined.
The results of calculation and measurement of temperature distribution in the leasing out of dielectric materials which are heated up in the microwave devices wave-water type. The calculation method of microwave devices of a waveguide type of heat treatment of sheet dielectric materials. Considered microwave devices, Otley-exclusive feature of which is the change of the geometrical sizes of a narrow wall of a rectangular waveguide, working mainly on the type of waves to ensure a uniform temperature in the processed sheet the dielectric-dielectric material.
The book, brought to your notice, takes an intermediate place between monographs and textbooks: on the one hand, it contains the known but stated in an unusual way facts, on the other hand, the author brought his own results corresponding to the field of research. It is already obvious from the title that while reading the book, attention and concentration are required, as it is always necessary when studying books with mathematical contents.
Mathematical models and methods in the economic theory are very various: they are econometrics, the game theory, operation research, nonlinear and chaotic dynamics and many other things. The sections placed by the author in the book do not content even a half of all possible aspects. Therefore, material will be interesting only to those who are already familiar with corresponding tasks and to students of all levels specializing in economic dynamics, in decision-making methods, in forecasting effects of management and in the analysis of interaction of economic agents.
As the most interesting and new models of economic dynamics we will emphasize multidimensional nonlinear systems of the differential equations of Lotka-Volterra type. In the book these models have been constructed and analyzed, scopes of their application and various methods of coefficients identification have been offered for them. On their base, the analysis of the competition between various economic agents, i.e. branches of economy, rival companies and sellers in the market has been made: Another unusual to similar monographs fact has become the inclusion of the theory of differential equations with the retarded argument. In the economic theory there are numerous examples of use of models with discrete time (they also have been given attention here) and with the time lags (concentrated or distributed). Such approach gives more adequate models than without lags, but in the differential equations with continuous time the introduction of delay complicates systems and with the growth of delay the qualitative behavior of trajectories is changed: there appear fluctuations; stability is changed by instability, etc.
As the author belongs to the Petersburg mathematical school and he gave this direction of science more than 35 years, the list of references contains many Russian names which can be unknown to western readers. However, the list also includes the world classical scientists who devoted their works to mathematical methods in economics.
In this monograph an attentive reader will find numerous points for the further analysis which can become a subject of publications or theses. In some cases the text is conducted in a polemic manner – the author is always open for discussions and does not consider himself as "the ultimate truth".
The results of microwave influence aimed at the temperature rise in local area in multilayered biological tissues are given. the experimental results of temperature distribution in multilayered biological tissue are presented at the electromagnetic field frequency of 2450MHz. The model and analytic calculations for the temperature distribution inside the biological tissue are presented. The calculation results for the temperature distribution in multilayered biological tissues are given.
The experimental research results of the basalt cardboard thermal treatment with the microwave electromagnetic energy application are presented in the article. The weight change diagrams of the basalt cardboard samples during the drying process are given. Changes in the temperature behaviour are analyzed on the surface and inside the samples depending on coupling medium. An advice on the drying process parameters improvement is given.
Tthe IMPI 48 program offers topics for everyone interested in learning about the latest developments in microwave power science and technology. Each year, IMPI brings together researchers, technologists and engineers from across the globe to share the latest findings of microwave and radio frequency power systems for non-communication applications, including food technology, chemical and material processing, and new emerging technologies. IMPI 48 Symposium was held at the Doubletree Hotel on Canal Street in downtown New Orleans, Louisiana, USA. New this year, IMPI 48’s Food Science and Technology Program will cover topics such as: microwavable food safety, microbiological testing, product validation, microwave oven standards, microwave leakage monitoring, industrial microwave and RF food processing.
The computational model of the temperature sensors integrated on the IC chip with power transistors is developed. The 2D/3D problem of sensor placement is mathematically described by the classic heat transfer equation coupled with the equation for current density distribution. It is shown that parasitic effects of sensor current displacement and thermo-emf generation resulting from a temperature gradients (Seebeck effect) must be taken into account. For this purpose the special differential equation is introduced. The examples of point- and strip-like temperature sensors modeling for power BJTs and ICs are demonstrated.
Questions of the even temperature distribution creation in the volumetric materials with different dielectric losses placed in the beam-type microwave device are examined. The volumetric material was irradiated by two types of antennas which provided perpendicular and parallel flux direction of the electric-field vector relatively to the material's surface. Experimental data on the temperature field distribution in the volume of material is presented. It is shown that the total temperature dispersion is less than 5ºC inside the material heated up to 80ºC.