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Introduction
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Publications
Publications (65)
In receivers with frequency conversion, false artificial signals, so-called "Birds", may occur at the frequencies and their harmonics of internal heterodynes. Model estimates and measurement results of artifacts in the spectra of radio signals obtained in the SDR receiver HackRF & PortaPack are presented.
A technique for representing and calculating the orientation of the heliostatic mirror based on vector representations of the directions to the sun and the mirror related to a fixed observation point is presented. Vector representation of directions to the sun and the heliostatic mirror allows us to obtain a description of the mirror orientation th...
Исследуются частотные характеристики индуктивно-емкостной трехточки - LC-моста в качестве элемента однотранзисторного генератора 27MHz.
Description of the design of a simple RC toy remote control with a 27MHz radio transmitter.
Capacitive three-point circuits, inductive three-point circuits, and circuits with transformer coupling are well known and widely used in oscillator circuits. In some cases, a scheme is used that combines the properties of all of these schemes. Thus, the inductive-capacitive LC-bridge circuit does have an advantage over the classic capacitive three...
A simple algorithm to calculate mirror orientation for a solar energy concentrator.
Modeling of Piezoelectric and Acoustic Elements with LTspice\SwCad.
The LTspice\SwCad model for an ultrasonic piezoelectric transducer and acoustic medium is described. This model allows the simultaneous evaluation of the electric and acoustic characteristics of a complex piezoelectric system with an acoustic load. This model is very useful
for the...
The article describes ten years of experience in integrating the environmental component into the educational process of the engineering specialty and the parallel strengthening of the engineering component in the curriculum of the natural science (non-technical) specialty 101 Ecology. This is ensured through scientific cooperation of the departmen...
In this paper, an approach to the development of medical wearables is proposed. The system integrates sensing modules, Wi-Fi microcontroller and Web browser based user interface. As an example, ECG-PPG monitor is presented. The signals are acquired by AD8232 ECG amplifier module and MAX30102 PPG and SpO2 system on chip. The ESP8266 microcontroller...
In this paper, an approach to the development of medical wearables is proposed. The system integrates sensing modules, Wi-Fi microcontroller and Web browser based user interface. As an example, ECG-PPG monitor is presented. The signals are acquired by AD8232 ECG amplifier module and MAX30102 PPG and SpO2 system on chip. The ESP8266 microcontroller...
The seasonal variations of solar photovoltaic cells
photocurrent under cloudless conditions are analyzed. This
analysis is done by using models of the absorption of solar
radiation in the atmosphere and the spectral response of
various types of solar cells. The problems of determining the
atmospheric model parameters for calculating seasonal
variat...
The seasonal variations of solar photovoltaic cells
photocurrent under cloudless conditions are analyzed. This
analysis is done by using models of the absorption of solar
radiation in the atmosphere and the spectral response of
various types of solar cells. The problems of determining the
atmospheric model parameters for calculating seasonal
variat...
The seasonal variation of the photocurrent of solar cells and its difference for c-Si and a-Si cells are described by the spectral features of atmospheric absorption and the spectral response of the cell material.
It was descovered that amorphous silicon cells are not a perfect object for studying seasonal variations in atmospheric absorption, due...
Two components model of solar radiation for PV-energy efficiency estimation
Kubova R.M., Kubov V.I.
The monograph deals with the evaluation of the efficiency of solar photovoltaic cells. The evaluation based on the modeling of seasonal and daily variations of the incoming solar energy flow. The description of the two-component insolation model dev...
The possibility of implementing an HTML user
interface for a stand-alone microcontroller device is tested out.
The wireless Wi-Fi ECG monitor is considered as an example. It's
shown that the standard HTML-5 and Java-Script features, such
as Canvas, Web-Socket and other, are quite enough to build a fullfledged user interface that is not attached to...
The possibility of implementing an HTML user interface for a stand-alone microcontroller device is tested out. The wireless Wi-Fi ECG monitor is considered as an example.
It's shown that the standard HTML-5 and Java-Script features, such as Canvas, Web-Socket and other, are quite enough to build a full-fledged user interface that is not attached t...
The monograph deals with the evaluation of the efficiency of solar photovoltaic cells. The evaluation based on the modeling of seasonal and daily variations of the incoming solar energy flow. The description of the two-component insolation model developed by the authors taking into account the cloudiness is given.
The model is based on a semi-empi...
A comparison of seasonal and diurnal variations of the photocurrent of different types of PV panels is done for cloudless conditions. PV-panels made of amorphous and crystalline silicon are compared.
A simple two-component model of seasonal and diurnal variations of atmospheric transparency is proposed.
Every model component is responsible for th...
A comparison of seasonal and diurnal variations of the photocurrent of different types of PV panels is done for cloudless conditions. PV-panels made of amorphous and crystalline silicon are compared. A simple two-component model of seasonal and diurnal variations of atmospheric transparency is proposed. Every model component is responsible for the...
LTspice-model. By using short Charge impulses we are slowing charging. This allows us to use relative small Capacitance and relative slow ADC. I(V) and V(V)-charts for Line Voltage source with internal Serial Resistance. V=V i+1-V i =I* t/C ¡ I= V*C/ t
UNI-T UT383 Luxmeter Testing. MS6610 luxmeter is used as reference.
Watts to Luxes Ratio for Sollar Radiation by TMY Data for Odessa.
Global Horizontal, Direct Normal, Diffuse Horisontal Illimiation to Radiation Ratios.
To determine parameters of ThermoElectric Cooler – TEC, you will need to follow this 8 step simple procedure.
Comparative data for PV-panels photocurrent separated by several years of observation
To determinate parameters of Thermoelectric Cooler – TEC, you will need to follow this 7 step simple procedure.
LT-spice model of single photo-voltaic cell with feedback between photocurrent and temperature, determined by dissipated power in the cell is proposed. Thermal effects are studied in cells with small efficiency difference, in the seriesconnected PV-cells. The positive feedback between temperature and current leads to cells temperature smoothing.
LT-spice model of single photo-voltaic cell with feedback between photocurrent and temperature, determined by dissipated power in the cell is proposed. Thermal effects are studied in cells with small efficiency difference, in the series-connected PV-cells. The positive feedback between temperature and current leads to cells temperature smoothing...
The results of simultaneous measurements of wind speed and insolation were observed for automated digital research complex in CHNU by P. Mohyla. Statistical characteristics of the daily average wind and insolation, and their mutual relations were calculated. The probability model of certain energy provision for separate and joint use of wind and so...
Real dayli data on PV-battery Isc current relative to Model calculations. Model includes Clear Sky Insolation and Cloudiness Attenuation calculated by meteorological data.
The pair of 40KHz UltraSound Transducer and Receiver is use for open air. Arduino like microcontroller board with 16MHz Atmega8 is used. The LTspice-model of four-phase generator and synchronous phase detector for microcontroller is discribed. Symple schematic proposed.
A simple, symmetric, convertible into electric generator mode LTspice-model of Peltier-Seebeck element is proposed. The model parameters are extracted from the experimental measurement results of the electrical and thermal characteristics of the real elements.
A simple, symmetric, convertible into electric generator mode LTspice-model of Peltier-Seebeck element is proposed. The model parameters are extracted from the experimental measurement results of the electrical and thermal characteristics of the real elements
The numerical analysis of PV-circuit on Short Circuit (SC) mode leads to the paradoxical conclusion: The temperature overheating of weakest cell is several times higher relative to cooling of other cells. This result is independent of numeric value of photocurrent weakness.
This article represents the results of experimental studies of the wind effect on the surface temperature of the solar photovoltaic panels. The analytical temperature dependence from the solar radiation, wind, and ambient temperature is represented.
The analysis results in solar panel’s surface temperature field according to electric load. The
temperature was measured with a few devices, such as: contact digital temperature sensors, noncontact
IR-thermometer and Thermal Imager. Obtained values are compared to each other
The article describes experimental results of temperature measurements on solar PV-batteries depending on electrical load and environment conditions.
The article describes experimental results of temperature measurements on solar PV-batteries depending on electrical load and environment conditions.
The teaching model of DC-motor Rotor’s and Stator’s Power Attachment study is propose.
Model: https://groups.yahoo.com/neo/groups/LTspice/files/%20Lib/Teaching/DCmotor/
The article is described the empirical model of the insolation of solar PV-batteries according to the cloudiness. The model takes into account: geographical location and orientation of the cells relative to the sun; the regular absorption in the clear atmosphere; diffuse component of insolation; and cloud absorption. Cloud absorption is given by th...
Induction 3-phase motor model is describe.
Model: https://groups.yahoo.com/neo/groups/LTspice/files/%20Tut/Induction3phMotor/
Simple method for Diode SPICE-model parameters selection. Inut data: Vmax, Imax and I(V) slope - dV for I/I0=2.7. Output data: ideality factor - N, and saturation current - Is.
Demands for the powerful generator of magnetic impulses are under discussion.
The LTspice\SwCad model for an ultrasonic piezoelectric transducer and acoustic medium is described. This model allows to simultaneous evaluation both electric and acoustic characteristic for the complex piezoelectric system with acoustic load. Such possibility is very useful for investigation of the acoustic part coupling influence on electric par...
The LTspice\SwCad model for an ultrasonic piezoelectric transducer and acoustic medium is described. This model allows the simultaneous evaluation of the electric and acoustic characteristics of a complex piezoelectric system with an acoustic load.
Model: https://groups.yahoo.com/neo/groups/LTspice/files/%20Tut/Piezo%20Acoustic/
An analysis is made of data from six oblique-sounding paths 6-10 thousand kilometers long; the sounding was done in the 8-20 MHz range, in an autumn-winter period characterized by high solar activity. Four of the paths passed through a zone of auroral absorption (AA), in the form of ring-shaped region limited by the invariant latitudes 60-78 deg. I...
Questions
Questions (11)
In receivers with frequency conversion, false artificial signals, so-called "Birds", may occur at the frequencies and their harmonics of internal heterodynes. The SDR receiver HackRF One is implemented using a double frequency conversion scheme. The peculiarity of artifacts is that their frequency changes depending on the range and method of processing. This, in particular, makes it possible to distinguish artifacts from true signals.
Can anyone help me find documentation on spectral processing algorithms in HaсkRF & PortaPack?
Please don't send me links to huge libraries of complete source code for the entire system. I need specific guidance on implementation details.
