A QRS-complex detector of the electrocardiogram signal for the long-term monitoring of the patient’s condition

A procedure for detection of the QRS complexes of electrocardiogram (ECG) signals for systems of long-term monitoring of the patient’s condition based on successive use of the band-pass filtering, the Hilbert transform, and an adaptive threshold algorithm is considered. The efficiency of different QRS-complex detectors has been investigated for model ECG signals in the presence of interferences of various nature and intensity. The efficiency of the proposed procedure has been additionally tested using various clinic records of ECG signals from the MIT Physionet database.     

Effects of the p-AlInGaN/GaN superlattices’structure on the performance of blue LEDs

The advantages of the p-AIInGaN/GaN superlattices＇ （SLs） structure as an electron blocking layer （EBL） for InGaN blue light-emitting diodes （LEDs） were studied by experiment and APSYS simulation. Elec- troluminescence （EL） measurement results show that the LEDs with the p-AllnGaN/GaN SLs＇ structure EBL ex- hibited better optical performance compared with the conventional A1GaN EBL due to the enhancement of hole concentration and hole carrier transport efficiency, and the confinement of electrons＇ overflow between multiple quantum-wells （MQWs） and EBL.     

Parameters of vacancies’ formation in the carbon-subgroup crystals

The parameters of formation of vacancies in crystals of elements of the carbon subgroup (C_diam, Si, Ge, α-Sn, Pb) are calculated. The method used takes into account both quantum effects at low temperatures and delocalization of atoms at higher temperatures. It is shown that consideration of atom delocalization brings about an increase in the values of enthalpy and entropy and the volume of the vacancy formation. At low temperatures, the parameters of vacancy formation depend heavily on temperature, with the entropy of vacancy formation becoming negative. In the region of high temperatures, good agreement was obtained with both experimental data and theoretical estimates reported in other publications. The dependence of vacancy-related parameters on temperature in the course of isobaric heating of diamond in the range from 100 to 4500 K is studied. The limits of applicability of the Arrhenius equation with temperature-independent energy of activation process are discussed. It is shown that there is validity of the “compensation rule” (correlation between the entropy and enthalpy of vacancy formation) and of the correlation between the volume and entropy of the vacancy formation within the entire studied temperature range.     

Influence of the frequency dispersion of resonators’ coupling coefficients on the accuracy of direct-synthesis formulas for microwave filters

For the case of a wideband filter designed on the basis of parallel oscillatory circuits with combined coupling, the influence of the slope of the frequency characteristics of the coupling coefficients in a tuned filter on the values of these coefficients at the resonant frequency is investigated. The slope angle of these curves is controlled by the ratio of the inductive and capacitive components of the coupling coefficients. The actual values of the coupling coefficients are compared with the values obtained from the direct-synthesis formulas.     

A new method for the fast determination of the data retention lifetime of UV EPROM’s

The newly developped method involves a controlled partial erasure of a charged ultraviolet erasable programmable read only memory device followed by a period of high temperature storage. The model is based on two assumptions: the amount of charge stored at the floating gate of a programmed cell is assumed to be equal throughout a component and the trip the minimum level of charge stored at the floating gate of a programmed cell, has a Gaussian distribution throughout a component. The experimental data are well described by the model. After implementation of the experimental results in the model we extrapolate the data retention lifetimes of the UVEPROM’S under operational conditions. Our measurements show that most of the tested UVEPROM devices (64 ko to 256 ko) have a similar operational lifetime, only the charge leakage activation energy differs (0.35 to 0.9 eV) depending on the type of component. In conclusion this method and model are suitable for a fast determination of UVEPROM’S data retention lifetimes under operational conditions.     

Dependence of the efficiency of a CdS/CdTe solar cell on the absorbing layer’s thickness

On the basis of the continuity equation, the spatial distribution of photogenerated excess electrons in the neutral region of the CdTe layer in a CdS/CdTe heterostructure is analyzed taking into account recombination at the rear surface of the layer. It is demonstrated that, owing to diffusion, excess electrons penetrate deep into the CdTe layer at distances far exceeding the effective penetration length for solar radiation. Calculations of the short-circuit current indicate that, for electron lifetimes of 10^?10–10^?9 s, typical of thin-film CdS/CdTe solar cells, recombination losses are insignificant if the CdTe layer’s thickness amounts to 3–4 μm but increase dramatically if the thickness is below 1–1.5 μm. In order to eliminate recombination losses in more efficient solar cells where the electron lifetime is ≥10^?8 s the absorbing CdTe layer needs to be much thicker.     

On the 70th birthday of Vladimir Grigor’evich Mokerov

Chronicle

On the 70th birthday of Vladimir Grigor’evich Mokerov     

To the 80th anniversary of Ruslan Leont’evich Stratonovich

Chronicle

To the 80th anniversary of Ruslan Leont’evich Stratonovich     

On the 80th birthday of Anatolii Vasil’evich Vashkovskii

Chronicle

On the 80th birthday of Anatolii Vasil’evich Vashkovskii     

Evaluation of the Alzheimer’s disease clinical stages under the optics of hybrid approaches in Verbal Decision Analysis

The decision making process is present in every moment of personal life, but other decisions need a further analysis of a considerable number of factors is involved. The impact of each decision is analyzed mainly from two points of view, being one for it and one against it. It is intended to determine in this research which of the tests are relevant and would detect whether the patient is developing the early diagnosis of diseases like Alzheimer’s. The tests should be applied in two stages. Initially, a classification method will be implemented to determine which questionnaires from a set would, themselves, detect the Alzheimer’s disease. After, the questionnaires classified as the ones that would give this diagnosis will be ordered by means, from the most likely one to lead to the diagnosis faster, to the least, considering an ordination methodology. This paper presents a hybrid model for the early diagnosis of Alzheimer’s disease by applying methods of Verbal Decision Analysis structured considering the methods ARACE and NORCLASS.     

On the 80th birthday of Anri Amvros’evich Rukhadze

Chronicle

On the 80th birthday of Anri Amvros’evich Rukhadze     

On the 70th birthday of Anatolii Serafimovich Il’inskii

Chronicle

On the 70th birthday of Anatolii Serafimovich Il’inskii     

Propagation of short radio waves and the potential of the Earth’s ionosphere radio-sounding method for calculation of maximum usable frequencies

The influence of the ionosphere on propagation of short radio waves is considered. Data on the monthly average diurnal values of critical frequencies at midlatitudes are presented. The applicability of the radio-sounding method to investigation of the state of the Earth’s ionosphere is demonstrated. Comparison of the data obtained from the path sounding of the ionosphere and from the radio-sounding method is performed. It is shown that satellite navigation systems can be used for prediction of the propagation conditions of short radio waves.     

To the memory of Mikhail Grigor’evich Mil’vidskii (1932–2009)

In Memoriam

To the memory of Mikhail Grigor’evich Mil’vidskii (1932–2009)     

Constructivist treatment of Bell’s inequality violations and the no-hidden-variable theorems

The biphoton experiment demonstrating Bell’s inequality violation is discussed from the standpoint of constructive quantum mechanics. It is shown that the no-go theorems on hidden-variable theories follow from the fact that the problem of applicability of an arbitrary algorithm to an arbitrary number cannot be solved effectively.     

Comparison of the usability and security of NFC’s different operating modes in mobile devices

This paper highlights the benefits and drawbacks of NFC’s different operating modes with regard to their usability and security. Based on an analysis of both traditional and new communication concepts for mobile NFC devices, their current availability and, specifically, the features to provide security are evaluated. The result of this evaluation is a comparison between the availability, the usability and the security of NFC’s different operating modes.     

A Study of the Effects of the Current InternationalSettlement of Internet

1　TheUnbalancedDevelopmentofInternetandtheDigitalDivideAmongCountries　　Withtheadvanceofinformationtechnology ,Internethaspenetratedintovariousaspectsofsocialandeconomiclifedeeplyandimprovedthedevelop mentofproductivityenormously ,which producestheobvioustendencyofeconomicglobalization .In ternetexpeditestheprocessofeconomicglobaliza tion ,throughwhichanycountrywouldbeabletoparticipateintheglobalproductionandrebuildingthetraditionalindustrymoreintensivelyandexten sively.Alotofnewinformati…