Experimental studies of the spectral resonance structure of the atmospheric electromagnetic noise background within the range of short-period geomagnetic pulsations

1989 ◽  
Vol 32 (6) ◽  
pp. 491-501 ◽  
Author(s):  
P. P. Belyaev ◽  
C. V. Polyakov ◽  
V. O. Rapoport ◽  
V. Yu. Trakhtengerts
Keyword(s):  
Experimental Studies ◽  
Resonance Structure ◽  
Geomagnetic Pulsations ◽  
Electromagnetic Noise ◽  
Noise Background ◽  
Short Period

scholarly journals Timing of Medieval Fluvial Aggradation at Bremgarten in the Southern Upper Rhine Graben – a Test for Luminescence Dating

2009 ◽  
Vol 57 (3/4) ◽  
pp. 411-432
Author(s):  
Manfred Frechen ◽  
Dietrich Ellwanger ◽  
Daniel Rimkus ◽  
Astrid Techmer
Keyword(s):  
Little Ice Age ◽  
Radiocarbon Dating ◽  
Experimental Studies ◽  
Luminescence Dating ◽  
Ice Age ◽  
Upper Rhine Graben ◽  
River Rhine ◽  
Fluvial Sediments ◽  
The Holocene ◽  
Short Period

Abstract. The Holocene flood plain of the River Rhine is a complex dynamic sedimentary system. A series of geochronological results for the Bremgarten section including optically stimulated luminescence (OSL) and radiocarbon dating was determined to improve the understanding of part of the Holocene evolution of the River Rhine. The applied single aliquot regenerative (SAR) protocols and the applied experimental studies to find the best luminescence behaviour leave us with confidence that OSL dating is a suitable method for dating fluvial sediments from large river systems. Insufficient bleaching of the sediments from Bremgarten prior to deposition seems to be not as dramatic as previously thought. OSL and radiocarbon dating results give evidence for a short period of major erosion and re-sedimentation of fluvial sediments from the “Tiefgestade” at the Bremgarten section between 500 and 600 years before present. This time period correlates with the beginning of the Little Ice Age at about AD 1450. Several severe floods occurred in Southern Germany between AD 1500 and 1750; all those floods correlate to the period of the Little Ice Age, including the destruction of the village of Neuenburg AD 1525.

scholarly journals FUZZY C-MEANS ALGORITHM FOR SEGMENTATION OF AERIAL PHOTOGRAPHY DATA OBTAINED USING UNMANNED AERIAL VEHICLE

2015 ◽  
Vol XL-5/W6 ◽  
pp. 113-115 ◽  
Author(s):  
M. V. Akinin ◽  
N. V. Akinina ◽  
A. Y. Klochkov ◽  
M. B. Nikiforov ◽  
A. V. Sokolova
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Aerial Photography ◽  
Experimental Studies ◽  
Two Dimensional ◽  
Fuzzy C Means ◽  
Aerial Vehicles ◽  
Short Period ◽  
Aerial Vehicle ◽  
Fuzzy C Means Algorithm

The report reviewed the algorithm fuzzy c-means, performs image segmentation, give an estimate of the quality of his work on the criterion of Xie-Beni, contain the results of experimental studies of the algorithm in the context of solving the problem of drawing up detailed two-dimensional maps with the use of unmanned aerial vehicles. According to the results of the experiment concluded that the possibility of applying the algorithm in problems of decoding images obtained as a result of aerial photography. The considered algorithm can significantly break the original image into a plurality of segments (clusters) in a relatively short period of time, which is achieved by modification of the original k-means algorithm to work in a fuzzy task.

scholarly journals Morphology of the spectral resonance structure of the electromagnetic background noise in the range of 0.1–4 Hz at <i>L</I> = 5.2

2003 ◽  
Vol 21 (3) ◽  
pp. 779-786 ◽  
Author(s):  
A. G. Yahnin ◽  
N. V. Semenova ◽  
A. A. Ostapenko ◽  
J. Kangas ◽  
J. Manninen ◽  
...  
Keyword(s):  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Morphological Properties ◽  
Occurrence Rate ◽  
Resonance Structure ◽  
Electromagnetic Noise ◽  
Radio Science ◽  
Frequency Scale ◽  
Ionosphere Model ◽  
The Difference

Abstract. Continuous observations of fluctuations of the geomagnetic field at Sodankylä Geophysical Observatory (L = 5.2) were used for a comprehensive morphological study of the spectral resonance structure (SRS) seen in the background electromagnetic noise in the frequency range of 0.1–4.0 Hz. It is shown that the occurrence rate of SRS is higher in the nighttime than in the daytime. The occurrence rate is higher in winter than in summer. The SRS frequencies and the difference between neighbouring eigenfrequencies (the frequency scale) increase towards nighttime and decrease towards daytime. Both frequency scale and occurrence rate exhibit a clear tendency to decrease from minimum to maximum of the solar activity cycle. It is found that the occurrence rate of SRS decreases when geomagnetic activity increases. The SRS is believed to be a consequence of a resonator for Alfvén waves, which is suggested to exist in the upper ionosphere. According to the theory of the ionospheric Alfvén resonator (IAR), characteristics of SRS crucially depend on electron density in the F-layer maximum, as well as on the altitudinal scale of the density decay above the maximum.We compared the SRS morphological properties with predictions of the IAR theory. The ionospheric parameters needed for calculation were obtained from the ionosphere model (IRI-95), as well as from measurements made with the ionosonde in Sodankylä. We conclude that, indeed, the main morphological properties of SRS are explained on the basis of the IAR theory. The measured parameters of SRS can be used for improving the ionospheric models.Key words. Ionosphere (auroral ionosphere; wave propagation) – Radio Science (electromagnetic noise and interference)

scholarly journals Chemical Compound Chemical Treatment in Animal Husbandry

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Xiaoling Tang ◽  
Ting Peng
Keyword(s):  
Chemical Treatment ◽  
Somatic Cells ◽  
Experimental Studies ◽  
Animal Husbandry ◽  
Gastrointestinal Diseases ◽  
Cattle Feed ◽  
Milk Output ◽  
Short Period ◽  
Financial Income ◽  
Better Than

The acidulant is widely used in the production of animal husbandry, and its use is affected by many factors, including environmental factors, dosage, diet composition, and animal’s own factors, so only the correct use of the acidulant can bring good results in animal production and financial income. This article takes acidifier as an example to study the application of compound chemical treatment in livestock farms. In this paper, the effect of using acidulant in the first 1 to 3 weeks after early weaning of piglets is obvious through this experimental study. The effect gradually decreases after 3 weeks and basically has no effect after 4 weeks. Experimental studies have found that the combination of organic acids, antibiotics, and high copper is the most effective. These three have different functions and have complementary or additive effects. Under harsh feeding conditions, especially when the environmental sanitation and environmental conditions are relatively poor, the effect of acidulants is better than good feeding conditions. Experimental data show that fulvic acid depletes milk’s somatic cells in a short period of time and then quickly activates immune function, which is indicated by the increase in lymphocytes in the blood. When a large number of somatic cells migrate to the breast, the somatic cells in milk will also increase, thereby improving the immunity mediated by human cells. The experimental results show that the BFA formula added 1% to the cattle feed. After the research control of this experiment, the milk output increased by 9–17%, and the quality milk output increased by 19.12%, so the use of acidulant increased feed compensation and reduces gastrointestinal diseases and the reproduction of microorganisms in the rumen of dairy cows.

scholarly journals Assessment of the mental fatigue state of an operator influenced by electromagnetic noise radiation

Informatics ◽  
2021 ◽  
Vol 18 (4) ◽  
pp. 26-39
Author(s):  
A. V. Sidorenko ◽  
M. A. Saladukha
Keyword(s):  
Scientific Literature ◽  
Experimental Studies ◽  
Mental Fatigue ◽  
Confidential Information ◽  
Electromagnetic Noise ◽  
Noise Radiation ◽  
Power Spectral ◽  
Analysis Theory ◽  
Gamma Rhythms ◽  
The Military

Objectives. The problem of determining the mental fatigue of the operator, which is processing the confidential information under the influence of electromagnetic noise radiation, is solved. The relevance of the problem is associated with the need to process the confidential information by the operator located in the limited space of a mobile technical system.Methods. The methods of spectral analysis theory of the results, received in the process of experimental studies the electroencephalograms, are used.Results. The results of experimental studies were obtained based on the processing and analysis of electroencephalograms recorded in standard leads Fp1, Fp2, F3, F4, C3, C4, P3, P4, O1, O2, F7, F8, T3, T4, T5, T6. The following quantitative parameters have been analyzed: power spectral density of delta-, theta-, alpha-, beta-, gamma-rhythms under the influence of electromagnetic noise radiation.Conclusion. The presence of mental fatigue of the operator is based on a comparative analysis of the obtained results and the data described in the scientific literature related to the occurrence of chronic mental fatigue; the fatigue caused by the military performing simulation tasks; mental fatigue caused by performing an RVP test.

scholarly journals Development of Ecosystem Research

ISRN Ecology ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-20 ◽  
Author(s):  
Raymond Louis Specht
Keyword(s):  
Plant Community ◽  
Arid Zone ◽  
Experimental Studies ◽  
Ecosystem Research ◽  
Short Period ◽  
Arid Zone Research ◽  
Understorey Plants ◽  
The Impact ◽  
Open Forests ◽  
Projective Covers

Experimental studies established the major community-physiological processes that determine the structure, growth and biodiversity of overstorey and understorey plants and resident vertebrates in an ecosystem. These community-physiological studies were promoted internationally by the UNESCO Arid Zone Research Program, the International Biological Program (Sections Productivity, Production Processes and Conservation), the International Union for the Conservation of Nature and, finally, the International Geosphere-Biosphere Program that is studying the impact of Global Warming on the World's ecosystems. During the short period of annual foliage growth in evergreen plant communities, aerodynamic fluxes (frictional, thermal, evaporative) in the atmosphere as it flows over and through a plant community determine the foliage projective covers and leaf attributes in overstorey and understorey strata. These foliar attributes determine the community-physiological constant, the evaporative coefficient, of the plant community. An increase in air temperature of during this period of annual foliage growth will affect the structure of the plant community, so that tall open-forests open forests woodlands open scrub low open-shrubland desert communities. Variation in available soil water during this short period of annual foliage growth will influence vertical shoot growth but not foliage projective covers and leaf attributes produced in the overstorey stratum.

scholarly journals REDUCTION OF THE CAR ENGINE WARMING TIME WHEN USING AN ADDITIONAL HEAT SOURCE

2021 ◽  
Vol 1 (48) ◽  
pp. 117-128
Author(s):  
Gutarevych Y ◽  
◽  
Kukhtyk N ◽  
Kukhtyk V ◽  
◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Heat Supply ◽  
Experimental Studies ◽  
Engine Operation ◽  
Air Filter ◽  
Warm Up ◽  
Additional Heat ◽  
Ambient Temperatures ◽  
Short Period ◽  
Air Intake

The article presents the results of additional experimental studies about the effect of heat supply to the intake air on the parameters and characteristics of the process of warming up the engine of a car. The aim of the work is to accelerate the car engine warming after starting at low temperatures. The research method is an experimental determination of the characteristics of active idling and concentrations of pollutants in the exhaust gases of the engine. The tests were performed when the car's engine was idling without heating the inlet air and with heating the inlet air through the air intake under the hood of the car and through the pipe in front of the intake manifold. Comparison of engine operation in active idling mode without heating the inlet air and with heating the air before inlet through the air intake, did not show significant differences. The long passage of preheated air through the air duct to the air filter, through the air filter and the air duct after the filter, causes cooling of the heated air and does not provide the efficiency of additional heat supply. For efficient use of additional heat supply, it is necessary to carry out this supply directly in front of the intake pipe. Most of the parameters that characterize the process of warming up the engine are obtained by direct measurement. Also, the dependences on which total indicators of economy and toxicity of the car were calculated are resulted in the article. According to the results of experimental studies, it is established that the operation of the car in low ambient temperatures leads to a deterioration of its fuel economy and environmental performance. For an internal combustion engine, with garage-free maintenance of the car in low ambient temperatures and with long periods of downtime, it is important to find and implement measures that allow, with minimal consumption of fuel and energy resources, to ensure warm-up of the cold engine. Additional heat supply to the inlet air provides rapid warming of the car engine to operating temperature, which provides a short period of preparation for the perception of the load. Intake air heating reduces fuel consumption during engine idling by an average of 4%. With additional heat supply, the concentrations of pollutants are being reduced, especially in the first 50 seconds of engine warm-up, and the total toxicity of the engine, determined by the two components (carbon monoxide and hydrocarbons) is being reduced by an average of 6%. KEY WORDS: ENGINE, HEAT, HEATING, FUEL CONSUMPTION, COOLANT TEMPERATURE, POLLUTANTS

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