Books by Costas Christodoulides
Papers by Costas Christodoulides
The Journal of Physical Chemistry, 1983
Dispersions of ice microcrystals obtained from the breakdown of water-in-oil emulsions were inves... more Dispersions of ice microcrystals obtained from the breakdown of water-in-oil emulsions were investigated by means of the depolarization thermocurrent (DTC) technique in the temperature range 85-250 K. Two predominant peaks were observed at temperatures of about 140 and 225 K. The low-temperature DTC peak at 140 K was studied extensively with different kinds of electrodes. Its position and shape were found to change in the course of time. The characteristics of the low-temperature DTC peak in dispersions of ice microcrystals at advanced states of evolution with time are discussed in relation to those of the low-temperature DTC in macroscopic pure ice. Our results provided more evidence that the low-temperature DTC peak in dispersions of ice microcrystals is due to dipolar absorption in ice. (3) I. D.
Journal of Physics: Condensed Matter, 1994
... The changes in the response of confined liquids at T,, observed in this and previous work [2 ... more ... The changes in the response of confined liquids at T,, observed in this and previous work [2 ... IO, 1 I]), making use of the very broad range of frequencies available for dielectric measurements. ...Solids 131-3 221 McKcnna GB private wmmunication Zhang I, Liu G and Jonas J 1992 J ...
Journal of Physics D: Applied Physics, 1991
Analysis and Presentation of Experimental Results, 2017
The method of least squares is developed. The application of the method in the fitting of the bes... more The method of least squares is developed. The application of the method in the fitting of the best straight line or curve to a series of experimental results, with the aim of determining the relationship existing between two variables. The method is also used in finding the optimal solutions of systems of overdetermined linear equations.
Analysis and Presentation of Experimental Results, 2017
Analysis and Presentation of Experimental Results, 2017
In order to understand the theory of errors, as well as the methods of analysis and presentation ... more In order to understand the theory of errors, as well as the methods of analysis and presentation of experimental results, knowledge of the basic concepts of Probability Theory and Statistics is required. The purpose of this chapter is the concise presentation of the basic concepts from these fields that will be used in the book. Obviously, the treatment will not be in great detail and the reader should consult the relevant bibliography for this purpose. Those readers who have a satisfactory knowledge of these subjects may omit this chapter and consult it whenever necessary. 1.1 Tables, Distributions and Histograms Let us assume that we have performed N measurements x i ði ¼ 1; 2;. . .; NÞ of a magnitude x, keeping the experimental conditions constant as far as possible. These measurements may be considered to be a sample which was taken from a parent population of the infinite number of measurements of this magnitude that may be performed under the particular conditions. In Table 1.1, the results of 100 such measurements have been recorded. This is the form in which the results appear immediately after the measurements, although the number of measurements is very rarely as high as this, except perhaps when they are acquired by an automated method. If the number of the measurements is large enough, there may be values which appear more than once. If we count the frequency of appearance of each value, we may construct a table of this number, n r , as a function of the numerical value x r of the measurement, such as Table 1.2. In this table, the values x r have been recorded in order of increasing magnitude and the number r is given in the first column of the table. The value of n r is the frequency of appearance of the r-th value. Obviously,
Analysis and Presentation of Experimental Results, 2017
Quite often, it is necessary to calculate the value of a quantity that was not measured directly ... more Quite often, it is necessary to calculate the value of a quantity that was not measured directly but is expressed on terms of one or more quantities which have been measured and whose means and standard deviations are known. The evaluation of the standard deviation of this quantity is done taking into account the so-called propagation of errors from the quantities that have been measured to the derived quantity.
The way in which the results of experimental measurements can be best used in the extraction of c... more The way in which the results of experimental measurements can be best used in the extraction of conclusions relating to the magnitude measured is presented. The understanding of the concepts and methods presented in this chapter possibly constitute the main benefit the reader may derive from studying this book.
The way in which numerical results should be presented are discussed. The S.I. system of units is... more The way in which numerical results should be presented are discussed. The S.I. system of units is also presented, as well as the basic rules that must be followed in its use for the presentation of experimental results.
Undergraduate Lecture Notes in Physics, 2016
Undergraduate Lecture Notes in Physics, 2016
The corpuscular nature of light was established not only by the interpretation Einstein gave to t... more The corpuscular nature of light was established not only by the interpretation Einstein gave to the photoelectric effect, but also by the success of the application of Relativistic Mechanics in the explanation of the observations of A.H.
Undergraduate Lecture Notes in Physics, 2016
Undergraduate Lecture Notes in Physics, 2016
The book is a revised version of the Greek edition. Copyright for all languages except Greek is o... more The book is a revised version of the Greek edition. Copyright for all languages except Greek is owned by the author. Original Greek edition I eidiki theoria tis sxetikotitas kai oi efarmoges tis or Η EIΔIKH ΘΕΩΡΙΑ ΤΗΣ ΣΧΕΤΙΚΟΤΗΤΑΣ ΚΑΙ ΟΙ ΕΦΑΡΜΟΓΕΣ ΤΗΣ,
Il Nuovo Cimento D, 1987
ABSTRACT
Physics World, 2003
The photograph that accompanied one of your articles about art and science does not show the Eart... more The photograph that accompanied one of your articles about art and science does not show the Earth "rising above the Moon's surface" (November 2002 p19).
[1991 Proceedings] 7th International Symposium on Electrets (ISE 7)
... h. Effective band temperature Tb of the high-temperature TSDC band in Tb of the high-temperat... more ... h. Effective band temperature Tb of the high-temperature TSDC band in Tb of the high-temperature TSDC band measured on Olea europaea lea-K ' I % 220 0 0.1 h 0.2 " 0 0 ... BB Sauer, P. Avakian, HW Starkweather, Jr. and BS Hsiao, Macromolecules 23, 5119 (1990).
AIP Conference Proceedings, 2010
ABSTRACT A poly(ethyl acrylate network), PEA, was swollen with several contents of p-xylene, c(px... more ABSTRACT A poly(ethyl acrylate network), PEA, was swollen with several contents of p-xylene, c(px), from xerogel until saturation ( 0 <= c(px) <= 0.86). Differential Scanning Calorimetry (DSC), Thermally Stimulated Depolarization Currents (TSDC) and Dielectric Relaxation Spectroscopy (DRS) were performed to probe the thermal transitions and the polymer molecular dynamics in these mixtures. The results show, that the mixtures are homogeneous in the whole temperature range studied for p-xylene contents c(px) < 0.20, whereas are partially crystallized for c(px). >= 0.20 (co-existence of homogeneous PEA/p-xylene phase and p-xylene crystallites). For 0.20 <= c(px) <= 0.30, the mixtures are partially crystallized only on heating (above the glass transition temperature, cold crystallization), while for c(px) > 0.30 during cooling. The partially crystallized mixtures exhibit a critical p-xylene content estimated at 0.12-0.15 that remains un-crystallized regardless of the p-xylene composition. The respective polymer glass transition temperature remains constant at -47 +/- 2 degrees C due to the presence of this specific amount of un-crystallized p-xylene for c(px) > 0.30, whereas it decreases significantly with increasing c(px). (0 < c(px) < 0.30). The alpha relaxation polymer segmental dynamics, related with the polymer glass transition, sustains its cooperative nature in the partially crystallized mixtures, whereas the distribution of a process relaxation times exhibit a slight broadening compared to the xerogel and homogeneous mixtures, ascribed to the spatial concentration fluctuations induced by the presence of p-xylene crystallites. Finally, the a process dielectric strength as well as the heat capacity increment of glass transition undergo significant depression compared to the homogeneous mixtures once the p-xylene crystallites are present.
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Books by Costas Christodoulides
Papers by Costas Christodoulides