362 results on '"V. A. Plotnikov"'
Search Results
102. Permeability dependency on stiff and compliant porosities: a model and some experimental examples
- Author
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R. Niemann, P. Yu. Ilyushin, Sergey V. Galkin, G. P. Khizhniak, V. V. Plotnikov, and Serge A. Shapiro
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Permeability (earth sciences) ,Geophysics ,Materials science ,Effective stress ,Geology ,Geotechnical engineering ,Management, Monitoring, Policy and Law ,Composite material ,Functional dependency ,Porosity ,Elastic modulus ,Industrial and Manufacturing Engineering - Abstract
The relation between porosity and permeability is not unique. We show that stress dependencies of both porosity and permeability can provide useful information clarifying this relation. We propose that comparison of the functional dependency of porosity and permeability on stress shows which part of the void space in rocks controls the permeability, the compliant porosity or the stiff porosity. The compliant porosity (including very thin cracks and grain-contact vicinities) usually controls the stress dependencies of elastic moduli of rocks. One then observes exponential-like dependencies of elastic properties on effective stress. Stress-induced deformation of stiff pores (equant pores) have less significance for stress dependencies of elastic properties on loadings of low to moderate magnitudes (several tens of MPa). However, such pores can play a significant role in the stress dependency of permeability. We propose a rather general model of permeability as a function of the stiff and compliant porosity. The model includes the possibility that, in different rocks, permeability can be controlled by stiff pores or, alternatively, by compliant pores, or, finally, by a combination of these. This model predicts a functional dependency of permeability on stress, ranging from power-law to exponential-law and to a mixed behavior of permeability in these situations, respectively. We show experimental results for four samples of sedimentary rocks from oil reservoirs of the Russian Perm region indicating these types of behavior.
- Published
- 2015
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103. Landscapes of the ‘Yuka’ mammoth habitat: A palaeobotanical approach
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Snezhana Zhilich, V. V. Plotnikov, A. V. Protopopov, S. V. Trofimova, and Natalia Rudaya
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Mammuthus primigenius ,biology ,Paleontology ,Sediment ,Macrofossil ,Vegetation ,medicine.disease_cause ,biology.organism_classification ,Archaeology ,Habitat ,Pollen ,medicine ,Stadial ,Ecology, Evolution, Behavior and Systematics ,Geology ,Mammoth - Abstract
In August 2010, a well-preserved Mammuthus primigenius carcass was found along the coast of Oyogos Yar in the region of the Laptev Sea and the mummy was nicknamed ‘Yuka’. Frozen sediment samples from the area of skull condyles were collected for pollen and plant macrofossil analyses. The results from the palaeobotanical investigation confirmed that the Yuka mammoth lived during the optimum of the Kargin Interstadial (MIS3). The burial place of the mammoth could have been a small shallow freshwater pond with either stagnant or slowly moving water. The vegetation of the Oyogos Yar in MIS3 optimum was probably represented by zonal tundra-steppe combined with mesic-xeric meadows.
- Published
- 2015
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104. New data on trunk morphology in the woolly mammoth, Mammuthus primigenius (Blumenbach)
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A. V. Protopopov, E. N. Maschenko, G. G. Boeskorov, I. S. Pavlov, E.A. Petrova, and V. V. Plotnikov
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Elephas ,Mammuthus primigenius ,Morphology (linguistics) ,biology ,Woolly mammoth ,Paleontology ,Anatomy ,biology.organism_classification ,Trunk ,Proboscidea ,Mammoth ,Proboscis (genus) - Abstract
A well-preserved trunk (proboscis) of the woolly mammoth (Mammuthus primigenius) found in 2010 in the area of the Oiyagosskii Yar, about 30 km west of the mouth of the Kondratievo River (Yakutia) is described (mammoth named Yuka). The distal part of trunk has a transverse expansion. In the expanded condition, it changes the trunk cross section from oval to ellipsoidal. The expansion is laterally framed by skin folds with sites of muscles making the trunk cross diameter twice as great. Trunk expansion has been recorded in three mammoths: Yuka, Kolyma mammoth, and Kirgilyakh mammoth calf. Structural details of the trunk expansion of the Kirgilyakh mammoth calf and Yuka are almost completely identical. This morphological feature distinguishes trunk of M. primigenius from Loxodonta africana and Elephas maximus ones, the cross section of which remains oval throughout the trunk extent. The adaptive value of this unique trunk structure of the woolly mammoth in connection with cold climate conditions is discussed.
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- 2015
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105. Experimental investigation of the electrocaloric response in ferroelectric materials
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A. A. Nikitin, Oleg Pakhomov, A. S. Anokhin, M. A. Cherkasskii, M. T. Bui, Alexander A. Semenov, I. L. Mylnikov, P. Yu. Belyavskii, A. V. Es’kov, and V. V. Plotnikov
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010302 applied physics ,Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Non-equilibrium thermodynamics ,Depolarization ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Ferroelectricity ,Titanate ,0103 physical sciences ,Thermal ,Electrocaloric effect ,0210 nano-technology ,Polarization (electrochemistry) ,Solid solution - Abstract
We have analyzed the electrocaloric response in ferroelectric materials in nonequilibrium thermal conditions. The temperature dependences of the electrocaloric response during polarization and depolarization of ferroelectric samples based on solid solutions of barium–strontium titanate and lead magnoniobate–titanate are considered. The difference in the electrocaloric responses for polarization and depolarization, which can be as large as 5 mK, has been demonstrated experimentally.
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- 2016
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106. MACHINE LEARNING IMPLEMENTATION FOR THE CLASSIFICATION OF ATTACKS ON WEB SYSTEMS. PART 2
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K. Smirnova, A. Smirnov, and V. M. Plotnikov
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Neural network, machine learning, intrusion detection system, protection of web applications, information security ,Cultural Studies ,History ,Literature and Literary Theory ,Computer science ,lcsh:Automation ,0211 other engineering and technologies ,02 engineering and technology ,World Wide Web ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Web system ,021105 building & construction ,lcsh:T59.5 - Abstract
The possibility of applying machine learning for the classification of malicious requests to aWeb application is considered. This approach excludes the use of deterministic analysis systems (for example, expert systems),and is based on the application of a cascade of neural networks or perceptrons on an approximate model to the real humanbrain. The main idea of the work is to enable to describe complex attack vectors consisting of feature sets, abstract terms forcompiling a training sample, controlling the quality of recognition and classifying each of the layers (networks) participatingin the work, with the ability to adjust not the entire network, but only a small part of it, in the training of which a mistake orinaccuracy crept in. The design of the developed network can be described as a cascaded, scalable neural network.When using neural networks to detect attacks on web systems, the issue of vectorization and normalization of features isacute. The most commonly used methods for solving these problems are not designed for the case of deliberate distortion ofthe signs of an attack.The proposed approach makes it possible to obtain a neural network that has been studied in more detail by small features,and also to eliminate the normalization issues in order to avoid deliberately bypassing the intrusion detection system. Byisolating one more group of neurons in the network and teaching it to samples containing various variants of circumvention ofthe attack classification, the developed intrusion detection system remains able to classify any types of attacks as well as theiraggregates, putting forward more stringent measures to counteract attacks. This allows you to follow the life cycle of theattack in more detail: from the starting trial attack to deliberate sophisticated attempts to bypass the system and introducemore decisive measures to actively counteract the attack, eliminating the chances of a false alarm system.
- Published
- 2017
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107. STABILIZATION OF MRNA CEREALS IN VITRO UNDER THE SILICON INFLUENCE
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Y. K. Yablonskaya, N. I. Nenko, A. A. Salfetnikov, and V. K. Plotnikov
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Messenger RNA ,Silicon ,Chemistry ,chemistry.chemical_element ,In vitro ,Cell biology - Published
- 2017
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108. THE CONCEPT OF THE «RNA WORLD»: THEORY AND PRACTICE
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A. A. Salfetnikov and V. K. Plotnikov
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RNA world hypothesis ,Philosophy ,Epistemology - Published
- 2017
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109. EFFECT OF GOLD NANOPARTICLES ON SEEDS GERMINATION OF WINTER BARLEY
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A. A. Golubev, L. A. Dykman, V. K. Plotnikov, and A. A. Salfetnikov
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Agronomy ,Germination ,Chemistry ,Colloidal gold - Published
- 2017
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110. The microstructure and magnetic properties of the Fe-Cu-Nb-Si-B finemets with different copper content
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V. V. Tkachev, N. V. Ilin, V. S. Plotnikov, A. N. Fedorets, G. S. Kraynova, D. A. Polyanski, and A. K. Tsesarskaya
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Materials science ,Annealing (metallurgy) ,Alloy ,Metallurgy ,chemistry.chemical_element ,Thermomagnetic convection ,engineering.material ,Microstructure ,Copper ,Amorphous solid ,Metal ,chemistry ,visual_art ,engineering ,visual_art.visual_art_medium - Abstract
The microrelief of three metal alloys with different copper contents was studied. It is shown, that samples with a small copper content are X-ray amorphous. The alloy with the addition of 1.5% copper characterizes by an amorphous-crystalline structure. The change in magnetic characteristics of alloys as a function of composition was studied during the thermomagnetic annealing process.
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- 2017
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111. Crystallization processes in an amorphous Co-Fe-Cr-Si-B alloy under isothermal annealing
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E. B. Modin, E. V. Pustovalov, V. S. Plotnikov, V. V. Tkachev, A. N. Fedorets, A. K. Tsesarskaya, A. M. Frolov, and G. S. Kraynova
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Materials science ,Chemical engineering ,law ,Transmission electron microscopy ,Material structure ,Alloy ,Isothermal annealing ,engineering ,engineering.material ,Crystallization ,Amorphous solid ,law.invention - Abstract
Research present the crystallization processes investigation of the amorphous Co67Fe3Cr3Si15B12 alloy. In-situ experiments on heating in a transmission electron microscope (TEM) column were carried out. Critical temperatures influencing material structure are determined. The onset temperature of material crystallization was determined.Research present the crystallization processes investigation of the amorphous Co67Fe3Cr3Si15B12 alloy. In-situ experiments on heating in a transmission electron microscope (TEM) column were carried out. Critical temperatures influencing material structure are determined. The onset temperature of material crystallization was determined.
- Published
- 2017
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112. On the photonics of aromatic azide molecules
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Serzhan Sakipov, V. G. Plotnikov, V. A. Smirnov, Ksenia Komarova, and M. V. Alfimov
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Chemical structure ,Ab initio ,Electron ,Photochemistry ,chemistry.chemical_compound ,chemistry ,Computational chemistry ,Excited state ,Physics::Atomic and Molecular Clusters ,Molecule ,Singlet state ,Azide ,Physics::Chemical Physics ,Physical and Theoretical Chemistry ,Luminescence - Abstract
Energies of electronically excited states of a number of aromatic azides have been calculated using ab initio quantum-chemical methods. It has been shown that the relative arrangement of the singlet and triplet states of the A′ and A″ types changes with an increase in the number of π electrons in the system. As in the case of other classes of heteroaromatic molecules, five relative locations of these states are possible. On this basis, the dependence of the luminescent and photochemical properties of molecules of aromatic azides on their chemical structure has been rationalized.
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- 2014
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113. Theoretical molecular photonics
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V. G. Plotnikov
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chemistry.chemical_classification ,Chemistry ,business.industry ,Polymer ,Radiation chemistry ,Photochemistry ,Chemical bond ,Molecule ,Chemical stability ,Physical and Theoretical Chemistry ,Photonics ,Adiabatic process ,Luminescence ,business - Abstract
Theoretical concepts of molecular photonics are presented. Features of the photophysical processes in molecular systems and the relationship between their probability and the electronic structures of the molecules are discussed. Possible mechanisms for the photochemical decomposition of electron-excited molecular systems with chemical bond cleavage are considered. The effect adiabatic photochemical reactions have on the probability of nonradiative conversion processes is shown. Dependences of spectral luminescence properties, the photochemical and radiation chemical stability of the molecular systems, and the efficiency of molecules of photostabilizers of polymers on their structure are interpreted. Areas of application are indicated for molecular photonics.
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- 2014
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114. Assessment of the economic activity greening level and the green economy development directions
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Y. V. Vertakova and V. A. Plotnikov
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Thesaurus (information retrieval) ,Greening ,Knowledge management ,business.industry ,Economics ,business ,Green economy - Abstract
Sustainable development is a priority in a modern world. The essence of sustainable development is to ensure such economic growth that allows to preserve the natural environment for present and future generations. One of the effective tools for this is the development of green economy. The authors consider the problems of sustainable development and a green economy on the example of Russia. The purpose of the study: (1) to develop a method for assessing the development of a green economy based on a comparison of environmental and economic indicators; (2) to test this method on the materials of the Russian regions, to assess their economic activity greening level; (3) to offer recommendations for improving policies and regulation in the development of the green economy. In this study, in order to assess the level of ecologization of the regional economy, a method of assessing ecological and economic territorial development is used, based on the calculation of the integral index. This technique allows for a comparative analysis of Russian regions in terms of environmental and economic development. The authors give a comparative quantitative assessment of the level of greening of the Russian regions. On this basis, the priorities and directions of development of the green economy are proposed. It is recommended to use these proposals in the regulation of regional development in order to achieve the main goal – sustainable development. These recommendations do not reflect only the specifics of the Russian Federation, and therefore may also be applicable in the international practice.
- Published
- 2019
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115. Business Model of Ecologically Balanced Reproduction of Fuel Resources from Waste
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Y V Vertakova, V A Plotnikov, and T N Babich
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Natural resource economics ,Reproduction (economics) ,Business ,Business model - Abstract
In modern conditions, the problem of waste processing is one of the most difficult and important. Traditionally in Russia, waste is processed by storing at landfills or burning. These methods are environmentally hazardous. The use of waste as raw materials is more promising. This requires new technological and economic developments. The purpose of the study is to form a new business model of ecologically balanced reproduction of fuel resources from waste, and the development of this business model both in technical, and in economic and organizational aspects. This business model will be an element of the development of a green economy. The basis of the research methodology was the concept of sustainable development. The study used methods of environmental, technological and economic analysis, data processing tools, organizational design, business modeling and forecasting. The main results of the research are the new business model of ecologically balanced reproduction of fuel resources from waste and the recommendations of its use at regional and municipal level. Economic and environmental effects were evaluated from the use of the proposed business model. The practical value of the results consists in the possibility of using them: by regional (municipal) authorities - when creating an enabling environment for the life of the population and organizing environmentally balanced waste processing; investors - when launching commercially effective projects of waste recycling.
- Published
- 2019
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116. Brief observe on iron silicide growth on amorphous silicon
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Alexander V. Shevlyagin, A. S. Gouralnik, N. G. Galkin, V. S. Plotnikov, S. V. Vavanova, S.A. Dotsenko, Ko-Wei Lin, A. K. Gutakovski, E. V. Pustovalov, A. I. Cherednichenko, and M. A. Neklyudova
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Amorphous silicon ,chemistry.chemical_compound ,Materials science ,chemistry ,Silicide ,Metallurgy ,Condensed Matter Physics - Published
- 2013
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117. Specific characters of the mammoth calf (Mammuthus primigenius) from the Khroma River (Yakutia)
- Author
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E. N. Mashchenko, I. S. Pavlov, A. V. Protopopov, and V. V. Plotnikov
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Fibrous joint ,Woolly mammoth ,Withers ,Ossification ,Anatomy ,Biology ,biology.organism_classification ,General Biochemistry, Genetics and Molecular Biology ,Elephantidae ,medicine.anatomical_structure ,medicine ,media_common.cataloged_instance ,Femur ,medicine.symptom ,General Agricultural and Biological Sciences ,Vertebral column ,media_common ,Mammoth - Abstract
The exterior, skeletal morphology, and teeth of a 4- to 5-month-old woolly mammoth calf, Mammuthus primigenius Proboscidea, Elephantidae from the Khroma River (Yakutia, Russia) are described. This is the third and best preserved frozen carcass of the mammoth calves from Yakutia. The calf is male (penis available). The individual age as determined by the degree of wearing of DP2 and the beginning of wear of DP3 corresponds to the stage of transition to combined feeding (milk and vegetal forage). At the same time, formation of the cranial sutures (sutura sagittalis, fronto-temporalis, squamo-temporalis, and the suture between os occipitale superior and os occipitale inferior) testifies to an older juvenile stage. The proximal and distal epiphyses of the humerus and the distal epiphysis of the femur are represented by paired centers of ossification. A comparison of the dimensions of the head, body, and legs with the corresponding parameters of other M. primigenius calves of the same age shows the individual variability (10–15%) of these features. Although of medium size characteristic of M. primigenius calves, the described individual lacks subcutaneous fat deposits in the withers and subdermal areas of the body flanks. Death was caused by a rupture of the body and vertebral column at the level of the pectoral vertebrae 11–12. The deformation of the legs and longitudinal stretching of the soft tissues of the body caused no bone fractures (except for three ribs in the zone of the rupture). The long bones are not dislocated either in the shoulder and pelvic girdles or relative to each other. Possible causes and the timing of the death of the mammoth calves preserved in the permafrost are discussed.
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- 2013
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118. Specificity of the redox photoreaction of dimers of thiadicarbocyanine dyes
- Author
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G. V. Zakharova, V. A. Smirnov, Alexander K. Chibisov, and V. G. Plotnikov
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education.field_of_study ,Hydroquinone ,Dimer ,Population ,General Chemistry ,Photoionization ,Photochemistry ,Ascorbic acid ,chemistry.chemical_compound ,Monomer ,Intersystem crossing ,chemistry ,Triplet state ,education - Abstract
The primary steps of the redox reaction of dimers of the thiadicarbocyanine dye and its 5,5′-dichloro derivative in aqueous solutions were studied in the presence of 4-nitroacetophenone, ascorbic acid, or hydroquinone. In water the dye molecules (anion, M−) mainly exist as dimers M2 2−. The laser pulse irradiation (10 ns, 532 nm) results in the population of the lowest triplet level M2 2−, whose depletion occurs due to both intersystem crossing to the ground state and photoinduced transition to the highest triplet state of the dimer followed by photoionization. Photoionization at low intensities of a laser pulse proceeds via the one-quantum mechanism going to the two-quantum mechanism with an increase in the laser pulse intensity. The photooxidation of the dimer in the lowest triplet state with 4-nitroacetophenone results in the formation of unstable radical anion M2 −· that spontaneously dissociates to monomer M− and radical M· of the dye. In the presence of electron donors (ascorbic acid, hydroquinone), the dimers in the triplet state are not photoreduced, but the electron donors reduce M2 −· and M· to the dye dimer and monomer, respectively.
- Published
- 2013
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119. New findings of unique preserved fossil mammals in the permafrost of Yakutia
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M. D. Tomshin, I. van der Plicht, I. N. Belolyubskii, Alexei Tikhonov, V. V. Plotnikov, Tatyana Kuznetsova, S. E. Grigoryev, O. R. Potapova, A. V. Protopopov, G. G. Boeskorov, S. D. Kolesov, Marina V. Shchelchkova, and E. N. Mashchenko
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Bison ,General Immunology and Microbiology ,Fossils ,Ecology ,General Medicine ,Cold Climate ,Permafrost ,General Biochemistry, Genetics and Molecular Biology ,Siberia ,Mammoths ,Paleontology ,Geography ,Animals ,Horses ,General Agricultural and Biological Sciences - Published
- 2013
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120. The Effect of Acid Treatments on the Bottom Zone of Clastic Reservoir Rocks of Perm Region
- Author
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V. V. Plotnikov, P. N. Rehachev, N. N. Barkovsky, N. N. Mikhailov, and S. N. Popov
- Abstract
The publication describes the aspects of laboratory analysis of acid influence on porosity and permeability and stress-strain behaviour of terrigenous reservoir rocks using the Perm Krai field as an example. A comprehensive laboratory study procedure for free volume and core sample testing in simulated reservoir conditions is represented. Certain test results for acid injection through a rock sample are given and acidizing impact on rock properties was assessed.
- Published
- 2016
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121. Analysis and Processing of the Results of Laboratory Experiments to Investigate Fracture Permeability Changes Under the Influence of Mechanochemical Effects of Water Injection into Carbonate Reservoir (Russian)
- Author
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S. N. Popov, V. V. Plotnikov, and N. Mikhailov
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Permeability (earth sciences) ,chemistry.chemical_compound ,Materials science ,chemistry ,Water injection (oil production) ,Carbonate ,Geotechnical engineering - Published
- 2016
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122. The Effect of Acid Treatments on the Bottom Zone of Clastic Reservoir Rocks of Perm Region (Russian)
- Author
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N. N. Barkovsky, P. N. Rehachev, N. N. Mikhailov, S. N. Popov, and V. V. Plotnikov
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Clastic rock ,Geochemistry ,Geomorphology ,Geology - Published
- 2016
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123. Variability and conjugacy of ice conditions in the system of east arctic seas (the Laptev, East Siberian, and Chukchi Seas)
- Author
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V. V. Plotnikov and V. I. Pustoshnova
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Fluid Flow and Transfer Processes ,Arctic sea ice decline ,Drift ice ,Atmospheric Science ,geography ,geography.geographical_feature_category ,Arctic dipole anomaly ,Antarctic sea ice ,Arctic ice pack ,Oceanography ,Polar seas ,Sea ice ,Cryosphere ,Geology ,Water Science and Technology - Abstract
The analysis of the long-term variability and spatiotemporal conjugacy of formation processes of ice conditions in the water areas of the Laptev, East Siberian, and Chukchi seas is carried out on the basis of the available data on the ice cover conditions in the above seas. On the whole, the type of relationships between the ice processes in the system of East Arctic seas indicates the existence of certain mechanisms generating the wave processes in the climatic system of the Arctic Basin manifested in the phase opposition in the development of ice conditions on the western and eastern peripheries of the basin under consideration. The statistical analysis of series of the ice coverage of water areas under consideration demonstrated that the existence of the long-term trend of this characteristic in some seas has its spatiotemporal features: the probability of the trend existence increases from west to east (from the Laptev Sea to the Chukchi Sea) and the trends are of opposite signs.
- Published
- 2012
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124. The effect of protic solvents on luminescent properties of dye molecules
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V. G. Plotnikov and P.V. Komarov
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Chemistry ,Biophysics ,General Chemistry ,Condensed Matter Physics ,Photochemistry ,Biochemistry ,Atomic and Molecular Physics, and Optics ,Gas phase ,Solvent ,chemistry.chemical_compound ,Molecule ,Dye molecule ,Solvent effects ,Luminescence ,Protic solvent - Abstract
The effect of a protic solvent on the spectral-luminescent properties (associated with relative energies of π π ⁎ and n π ⁎ states) of a dye molecule is considered. It is shown that generally this effect cannot be reduced to changes caused by H-bond formation, since changes caused by universal (non-specific) interactions with medium are comparable to them. It is shown that the common interpretation of the effect of protic-solvents on luminescent properties of luminophores (based on the consideration only of specific interactions) is reasonable only in case of bimolecular complexes in a non-polar solvent or in a gas phase. Neglecting the effect of non-specific (dipole–dipole) interactions is generally not reasonable.
- Published
- 2012
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125. The graphite oxide photoreduction mechanism
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M. V. Alfimov, V. A. Smirnov, Yu. M. Shul'ga, and V. G. Plotnikov
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chemistry.chemical_compound ,chemistry ,Excited state ,Inorganic chemistry ,Graphite oxide ,Singlet state ,Physical and Theoretical Chemistry ,Photochemistry ,Dissociation (chemistry) - Abstract
The mechanisms of dissociation of oxygen-containing moieties (-OH, -HCO, -COOH) upon the photoreduction of graphite oxide by UV light have been considered. It has been concluded that the photoreduction, which involves the detachment of the OH group and the molecular elimination of CO and CO2, occurs in singlet excited states. The energy threshold of the photoreduction processes is determined by the position of the repulsive terms of the system.
- Published
- 2011
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126. Investigating the correlation between crystalline and magnetic nanostructures in Co-Sm films by means of electron microscopy
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V. S. Plotnikov, B. N. Grudin, N. A. Smolyaninov, and A. P. Glukhov
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Nanostructure ,Materials science ,Magnetic structure ,business.industry ,Scanning confocal electron microscopy ,General Physics and Astronomy ,Nanocrystalline material ,law.invention ,Condensed Matter::Materials Science ,Optics ,law ,Transmission electron microscopy ,Energy filtered transmission electron microscopy ,Optoelectronics ,Electron microscope ,Thin film ,business - Abstract
We visualize nanocrystalline and magnetic structures in thin films of Co-Sm (fabricated by means of ion resputtering) using transmission electron microscopy and Lorentz microscopy. Filters based upon Gauss wavelets were used to decompose images of nanostructures with spatial periods ranging from 0.5 nm to 390 nm. It was found by wavelet filtration of images of the magnetic structure that nanostructures with the above periods determine the boundaries of the magnetic structure in thin films of Sm-Co.
- Published
- 2011
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127. Modification of the glass surface by titanium dioxide films synthesized through the sol–gel method
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I. V. Smirnova, A. E. Lapshin, V. V. Plotnikov, N. S. Shutova, Oxana V. Magdysyuk, A. V. Zav’yalov, M. F. Panov, Olga A. Shilova, and V. I. Shapovalov
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chemistry.chemical_compound ,Materials science ,chemistry ,Optical measurements ,Titanium dioxide ,Materials Chemistry ,Ceramics and Composites ,Surface modification ,Composite material ,Thin film ,Condensed Matter Physics ,Powder diffraction ,Sol-gel - Abstract
The glass surface has been modified by titanium dioxide films synthesized using the sol-gel method. The sol-gel synthesis has been optimized by the experimental design with the use of the Latin square method. The film composition has been evaluated using X-ray powder diffraction analysis and optical measurements. The photoinduced hydrophilicity of the modified glass has been investigated.
- Published
- 2011
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128. Relative position of excited electronic states of molecular systems as a function of solvent polarity
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V. Ya. Artyukhov, Pavel V. Komarov, Georgy V. Mayer, and V. G. Plotnikov
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Materials science ,Excited electronic state ,Chemical physics ,Position (vector) ,Solvent polarity ,Function (mathematics) ,Physical and Theoretical Chemistry ,Molecular systems - Published
- 2010
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129. The Specific Features of Innovations in the Sphere of Higher Education in Terms of Social and Economic Problems of Contemporary Russia
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V N Plotnikov
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высшее образование ,инновация ,lcsh:Sociology (General) ,инновационной развитие ,модернизация ,lcsh:HM401-1281 ,двухуровневая система высшего образования - Abstract
The innovative processes in the sphere of higher education are characterized by distinct specific features which require a detailed analysis. The material institutes a framework for their apprehension in terms of social and economic problems in Russia as well as structural changes occurring nowadays in the sphere involved.
- Published
- 2010
130. Estimation of the state of ice cover in the Sea of Japan
- Author
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A. N. Chetyrbotskii, T. V. Gordeichuk, and V. V. Plotnikov
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Fluid Flow and Transfer Processes ,Drift ice ,Atmospheric Science ,geography ,geography.geographical_feature_category ,Antarctic sea ice ,Arctic ice pack ,Ice shelf ,Physics::Geophysics ,Climatology ,Sea ice thickness ,Sea ice ,Cryosphere ,Astrophysics::Earth and Planetary Astrophysics ,Sea ice concentration ,Physics::Atmospheric and Oceanic Physics ,Geology ,Water Science and Technology - Abstract
The results of the analysis of the multiyear archive of ten-day observations of the state of ice cover in the Sea of Japan are considered. The sufficiency of the description of the state of ice cover is estimated with the help of traditionally used parameters: ice concentration, age, and forms. The character of distributions of principal ice cover parameters is analyzed. A close relation is revealed between the ice cover characteristics taken as independent. A conclusion is made that the ice information about the state of ice cover in the Sea of Japan is redundant.
- Published
- 2010
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131. Synthesis of fractal electron micrographs
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E. V. Pustovalov, N. A. Smolyaninov, Evgeny Modin, V. S. Plotnikov, and B. N. Grudin
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Nanostructure ,Materials science ,business.industry ,General Physics and Astronomy ,Modulus ,Fractal dimension ,symbols.namesake ,Optics ,Fourier transform ,Fractal ,Electron micrographs ,Phase (matter) ,symbols ,Composite material ,business ,Environmental scanning electron microscope - Abstract
A method of synthesis of fractal nanostructure micrographs most similar to the initial electron micrographs is considered. The method is based on the modified modulus of the Fourier transform of the examined micrographs; moreover, information on the transformation phase is preserved. The nanostructure micrographs so obtained can be filtered out from false structures engendered by some methods of electron-microscopic study.
- Published
- 2009
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132. Hydrodynamics and heat and mass exchange in a centrifugal-bubbling vessel
- Author
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F. Riger, V. D. Bakulina, V. A. Plotnikov, D. V. Kalekin, V. S. Kalekin, S. N. Kapanin, and A. L. Leonov
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High rate ,Splash ,Chemistry ,General Chemical Engineering ,Euler number (physics) ,Flow (psychology) ,Energy Engineering and Power Technology ,Thermodynamics ,Mechanics ,Mass exchange ,Physics::Fluid Dynamics ,Dwell time ,symbols.namesake ,Heat mass transfer ,Fuel Technology ,Geochemistry and Petrology ,symbols ,Froude number - Abstract
Results of experimental investigations of the hydrodynamics and heat and mass exchange of a centrifugal-bubbling vessel are presented in the form of criterial relationships. Owing to the high rate of heat mass transfer, the possibility of regulating the dwell time in the zone of contact with a gaseous flow, small clearance dimensions, low splash over, and simple design, centrifugal-bubbling (vortical-foam) vessels can be referred to as promising for use as water and gas coolers, absorbers, reactors for gas–liquid systems, etc.
- Published
- 2009
- Full Text
- View/download PDF
133. Two-photon photoprocesses in molecular systems
- Author
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V. G. Plotnikov, V. A. Smirnov, and M. V. Alfimov
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Photon ,Chemistry ,Chemical physics ,Ionization ,Polyatomic ion ,Molecule ,Physical and Theoretical Chemistry ,Atomic physics ,Triplet state ,Adiabatic process ,Bond-dissociation energy ,Dissociation (chemistry) - Abstract
A review of two-photon photoprocesses of polyatomic molecules in the condensed phase is presented. The mechanism and the kinetics of absorption of the second photon of light are discussed, as well as the features of the main two-photon processes (ionization, electronic excitation energy transfer, dissociation with abstraction of hydrogen atoms and molecular products). The research capabilities of the method are demonstrated. It is emphasized that one of the main requirements to molecules of effective light stabilizers for polymers is the absence of two-photon processes for these molecules, which is provided by the nonradiative conversion processes initiated by reversible adiabatic reactions. On this basis, interpretation of the properties of the main classes of light stabilizers for polymers is given.
- Published
- 2009
- Full Text
- View/download PDF
134. Experimental and theoretical investigation of the spectral and luminescent properties of some acridine compounds
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Lyibov G. Samsonova, V. G. Plotnikov, V. A. Sazhnikov, A. A. Khlebunov, N. I. Selivanov, M. V. Alfimov, V. Ya. Artyukhov, T. N. Kopylova, and G. V. Maier
- Subjects
Dipole ,chemistry.chemical_compound ,Reaction rate constant ,chemistry ,Excited state ,Acridine ,Protonation ,Physical and Theoretical Chemistry ,Absorption (chemistry) ,Internal conversion (chemistry) ,Photochemistry ,Luminescence - Abstract
Complex (experimental and quantum-chemical) investigation of the spectral and luminescent properties of acridine, 9-aminoacridine, 2,7-dimethyl-9-ditolylaminoacridine, and their protonated forms was performed. The electronic absorption and fluorescence spectra of the acridine dyes were studied at room temperature in ethanolic solutions at different pH values and in other solvents of different chemical nature and polarity. The energies of the excited states, the deactivation rate constants for the excited states, and the dipole moments are presented, which were obtained by calculations using the method of intermediate neglect of the differential overlap with special spectroscopic parameterization.
- Published
- 2009
- Full Text
- View/download PDF
135. A combined theoretical and experimental study on molecular photonics
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V. G. Plotnikov, V. A. Sazhnikov, V. Ya. Artyukhov, N. I. Selivanov, Georgy V. Mayer, Lyibov G. Samsonova, T. N. Kopylova, A. A. Khlebunov, and M. V. Alfimov
- Subjects
Dipole ,Work (thermodynamics) ,chemistry.chemical_compound ,Materials science ,Reaction rate constant ,chemistry ,Chemical physics ,Excited state ,Polyatomic ion ,Acridine ,General Physics and Astronomy ,Protonation ,Absorption (chemistry) - Abstract
A detailed account of quantum chemical procedures for estimating the rate constants of the photophysical processes at work in polyatomic organic molecules is given. The results obtained from combined experimental and theoretical research into the spectral-luminescent properties of acridine, 9-aminoacridine, 2,7-dimethyl-9-diphenylaminoacridine, and of their protonated forms are reported. The electronic absorption and fluorescence spectra of acridine have been investigated at room temperature in ethanol solution of varying pH and in other solvents of different chemical nature and polarity. The energy of excited states, the rate constants of the deactivation of the excited states, and the dipole moments obtained by quantum chemical methods for the examined compounds are presented. The findings of the investigations are discussed.
- Published
- 2008
- Full Text
- View/download PDF
136. Turbulent froth equipment for cooling compressed gases
- Author
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A. V. Il’in, V. S. Kalekin, D. V. Kalekin, and V. A. Plotnikov
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Reciprocating compressor ,Chemistry ,Turbulence ,General Chemical Engineering ,Energy Engineering and Power Technology ,Thermodynamics ,Mechanics ,Hydraulic resistance ,Physics::Fluid Dynamics ,Fuel Technology ,Geochemistry and Petrology ,Mass transfer ,Heat exchanger ,Lubrication ,Test data ,Dimensionless quantity - Abstract
Results are considered for an experimental study of turbulent froth heat exchange whose construction is protected by an RF patent. Limits are established from test data for equipment stable operation with different methods for feeding liquid into the contact device. Generalized relationships are presented in dimensionless form for heat and mass transfer and also for the hydrodynamics of flows in the equipment. The results obtained are used for improving the construction of turbulent froth equipment intended for intermediate cooling of a piston compressor without lubrication.
- Published
- 2007
- Full Text
- View/download PDF
137. Intermolecular interactions and spectral and luminescent properties of optical molecular sensors
- Author
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V. G. Plotnikov, V. A. Sazhnikov, and M. V. Alfimov
- Subjects
Proton ,Chemistry ,Chemical physics ,Excited state ,Intermolecular force ,Bathochromic shift ,Analytical chemistry ,Luminescence spectra ,Physics::Chemical Physics ,Physical and Theoretical Chemistry ,Absorption (chemistry) ,Luminescence ,Organic molecules - Abstract
The effect of intermolecular interactions of different types (universal interactions, H-bonding, electronic donor-acceptor interactions, and interactions with proton transfer) on the absorption and luminescence spectra of organic molecules of different classes, which are or can be used as optical molecular sensors, was considered. The classification of the types of intermolecular interactions and corresponding spectroscopic effects is given, which can be used, particular, in the development of optical sensors for detection of organic molecules in liquid and gaseous media.
- Published
- 2007
- Full Text
- View/download PDF
138. Photophysical processes and the photodissociation of chemical bonds in polyatomic molecules
- Author
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M. V. Alfimov, V. A. Smirnov, and V. G. Plotnikov
- Subjects
Quantitative Biology::Biomolecules ,Chemistry ,Photodissociation ,Intermolecular force ,Polyatomic ion ,Bond-dissociation energy ,Dissociation (chemistry) ,Chemical bond ,Chemical physics ,Computational chemistry ,Intramolecular force ,Physics::Atomic and Molecular Clusters ,Molecule ,Physics::Chemical Physics ,Physical and Theoretical Chemistry - Abstract
The main concepts of the nature of electronically excited states in polyatomic molecules and the intramolecular and intermolecular processes of their evolution are reported. The dependence of the probabilities of these processes on the electronic structure of the molecule is considered. Possible mechanisms of the dissociation of electronically excited molecules with bond cleavage are discussed, and the theoretical results of this consideration are given. The experimental data obtained by the authors are interpreted. In this case, attention is focused on C-H-bond photodissociation processes in a condensed phase, which are the best studied processes. The dissociation of other bonds is briefly discussed.
- Published
- 2007
- Full Text
- View/download PDF
139. Study of the Shape of Vapor Formations in Explosive Boiling
- Author
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B. P. Avksentyuk, V. V. Ovchinnikov, V. Ya. Plotnikov, and V. M. Kravchenko
- Subjects
Fluid Flow and Transfer Processes ,Materials science ,Explosive material ,Mechanical Engineering ,Boiling ,Thermodynamics ,Condensed Matter Physics - Published
- 2007
- Full Text
- View/download PDF
140. Stress-dependent permeability versus stiff and compliant porosity: theory and experiments
- Author
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P. Yu. Ilyushin, Serge A. Shapiro, V. V. Plotnikov, R. Niemann, Sergey V. Galkin, and G. P. Khizhniak
- Subjects
Pore water pressure ,Permeability (earth sciences) ,Materials science ,Effective stress ,Geotechnical engineering ,Composite material ,Functional dependency ,Porosity ,Elastic modulus ,Exponential function - Abstract
Relation between porosity and permeability is not unique. We propose that comparison of functional dependencies of both, porosity and permeability, on stress provides useful constraints for their relation. Such a comparison shows which part of the void space in rocks controls the permeability, the compliant porosity or the stiff one. The compliant porosity (including very thin cracks and grain-contact vicinities) usually controls load dependencies of elastic moduli of rocks. This leads to exponentially-saturating functional dependencies of elastic properties on effective stress. Stiff pores (equant pores) are less significant by loads from low to moderate ones (several tens of MPa). However, stiff pores can be of importance for the stress dependency of permeability. We propose a rather general model of permeability as a function of the stiff and compliant porosity. The model includes possibility, that in different rocks permeability can be controlled by stiff pores or, alternatively, by compliant pores or, finally by a combination of them. This model provides a power-lawor an exponential differential-pressure dependency or a mixed behavior of permeability in these situations, respectively. We show experimental results, on samples from a broad data basis of sedimentary rocks of Russian Perm region, indicating these types of behavior.
- Published
- 2015
- Full Text
- View/download PDF
141. Stiff- and Compliant-porosity Based Model of Permeability - Theory and Experiments
- Author
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R. Niemann, Sergey V. Galkin, Serge A. Shapiro, V. V. Plotnikov, G. P. Khizhniak, and P.Y. Ilyushin
- Subjects
Permeability (earth sciences) ,Hydrogeology ,Effective stress ,Geotechnical engineering ,Composite material ,Functional dependency ,Porosity ,Elastic modulus ,Igneous petrology ,Geology ,Exponential function - Abstract
Relation between porosity and permeability is not unique. We propose that comparison of functional dependencies of both, porosity and permeability, on stress provides useful constraints for their relation. Such a comparison shows which part of the void space in rocks controls the permeability, the compliant porosity or the stiff one. The compliant porosity (including very thin cracks and grain-contact vicinities) usually controls load dependencies of elastic moduli of rocks. This leads to exponentially-saturating functional dependencies of elastic properties on effective stress. Stiff pores (high-aspect-ratio pores) are less significant by loads from low to moderate ones (several tens of MPa). However, stiff pores can be of importance for the stress dependency of permeability. We propose a rather general model of permeability as a function of the stiff and compliant porosity. The model includes possibility, that in different rocks permeability can be controlled by stiff pores or, alternatively, by compliant pores or, finally by a combination of them. This model provides a powerlaw or an exponential differential-pressure dependency or a mixed behaviour of permeability in these situations, respectively. We show experimental results, on samples from a broad data basis of sedimentary rocks of Russian Perm region, indicating these types of behaviour.
- Published
- 2015
- Full Text
- View/download PDF
142. The deformation and acoustic emission of aluminum-magnesium alloy under non-isothermal thermo-mechanical loading
- Author
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S. V. Makarov, V. A. Plotnikov, M. V. Lysikov, and Evgeny Kolubaev
- Subjects
Materials science ,Mechanical load ,Alloy ,Metallurgy ,chemistry.chemical_element ,Thermal fluctuations ,Deformation (meteorology) ,engineering.material ,Isothermal process ,chemistry ,Acoustic emission ,Aluminium ,engineering ,Composite material ,Magnesium alloy - Abstract
The following study investigates the deformation behavior and acoustic emission in aluminum-magnesium alloy under conditions of non-isothermal thermo-mechanical loading. The accumulation of deformation in the alloy, in conditions of change from room temperature to 500°C, occurs in two temperature intervals (I, II), characterized by different rates of deformation. The rate of deformation accumulation is correlated with acoustic emission. With load increasing in cycles from 40 to 200 MPa, the value of the boundary temperature (Tb) between intervals I and II changes non-monotonically. In cycles with load up to 90 MPa, the Tb value increases, while an increase up to 200 MPa makes Tb shift toward lower temperatures. This suggests that the shift of boundaries in the region of low temperatures and the appearance of high-amplitude pulses of acoustic emission characterize the decrease of the magnitude of thermal fluctuations with increasing mechanical load, leading to the rupture of interatomic bonds in an element...
- Published
- 2015
- Full Text
- View/download PDF
143. Luminescent properties of chalcone and its aminoderivatives
- Author
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Serzhan Sakipov, V. G. Plotnikov, Ksenia Komarova, M. V. Alfimov, Томский государственный университет Физический факультет Кафедра оптики и спектроскопии, and Томский государственный университет Физический факультет Научные подразделения ФФ
- Subjects
Chemistry ,Biophysics ,халконы ,General Chemistry ,Spin–orbit interaction ,спин-орбитальное взаимодействие ,Chromophore ,Condensed Matter Physics ,Photochemistry ,Biochemistry ,Atomic and Molecular Physics, and Optics ,Intersystem crossing ,Molecular geometry ,Excited state ,Intramolecular force ,люминесценция ,диполь-дипольное взаимодействие ,Singlet state ,Solvent effects - Abstract
Excitation energies of singlet and triplet π π ⁎ and n π ⁎ transitions are calculated for chalcone and its aminoderivatives using quantum chemical approach. Solvent impact on the molecular geometry and excited state energies is investigated. Both universal (dipole-dipole) and specific (H-bond formation with C O group) interactions are taken into account. Dipole–dipole interactions are shown to stabilize the excited S π π ⁎ state in the systems studied in the same way as for others heteroaromatic luminophores. Specific interactions in protic solvents cause in addition significant geometry deformation to the non-planar structure of the chromophore. Large intramolecular spin–orbit coupling between the lowest singlet and triplet excited states in the latter case is revealed. It proves that intersystem crossing between these states should be the main channel of fluorescent quenching of 4-( N , N ′ - dimethylamino )-chalcone in protic solvents.
- Published
- 2015
144. Optical Properties of Colloidal Gold-Oligothymidine Conjugates and Their Variations on Hybridization with Polyadenylic Acid
- Author
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Lev A. Dykman, Nikolai G. Khlebtsov, Vladimir A. Bogatyrev, Boris N. Khlebtsov, and V. K. Plotnikov
- Subjects
chemistry.chemical_classification ,Absorption spectroscopy ,Stereochemistry ,Nanoparticle ,Surfaces and Interfaces ,Colloid and Surface Chemistry ,Membrane ,chemistry ,Colloidal gold ,Nucleic acid ,Biophysics ,Nucleotide ,Physical and Theoretical Chemistry ,Absorption (chemistry) ,Surface plasmon resonance - Abstract
The CG-15-T28 marker, a complex of colloidal gold nanoparticles (mean diameter is 15 nm) with thiol-modified oligothymidine molecules (probes) containing 28 nucleotides, is synthesized. The principle of spectrophotometric control of all stages of marker synthesis and application of the UV-visible absorption spectra to reveal the hybridization reaction in vitro is described. In particular, it is shown that the absorption values for nucleic acids and gold nanoparticles composing the marker are nonadditive in the absorption regions of nucleotides (260 nm) and plasmon resonance of colloidal gold (520 nm). The number of nucleotides chemically bound with one gold nanoparticle (≈140) is estimated by the data on the spectral analysis of the marker and supernatant of the intermediate product. The synthesized marker specifically stains the target molecules of polyadenylic acid in dot-hybridization on a membrane filter but does not stain control molecules of polyuridylic acid. Spectral changes are not observed upon the hybridization of the marker with control and target molecules in a solution. The application of freezing-thawing cycles demonstrates changes in the plasmon resonance of the marker in the presence of polyadenylic acid molecules and no changes in the case of polyuridylic acid. These effects are explained within the framework of the aggregation model that is different from the cross-link model.
- Published
- 2005
- Full Text
- View/download PDF
145. Heterocyclic Thiones and Their Analogs in 1,3-Dipolar Cycloaddition Reactions: IV. Reactions of 4-Aryl-2-phenyl-1,2-dihydrophthalazine-1-thiones with Nitrile Imides
- Author
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V. K. Bel'skii, V. F. Plotnikov, E. V. Budarina, V. A. Galishev, and N. N. Labeish
- Subjects
chemistry.chemical_compound ,chemistry ,Nitrile ,Aryl ,Organic Chemistry ,1,3-Dipolar cycloaddition ,Imide ,Medicinal chemistry - Abstract
4-Aryl-2-phenyl-1,2-dihydrophthalazine-1-thiones react with nitrile imides according to the [3 + 2]-cycloaddition pattern to give phthalazinespirothiadiazoles. The reaction occurs regioselectively at the exocyclic C=S bond.
- Published
- 2005
- Full Text
- View/download PDF
146. Exciplex formation in highly excited triplet states
- Author
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V. A. Smirnov, M. V. Alfimov, and V. G. Plotnikov
- Subjects
Solvent ,Work (thermodynamics) ,Chemistry ,Chemical physics ,Excited state ,Intermolecular force ,Molecule ,Physics::Chemical Physics ,Physical and Theoretical Chemistry ,Triplet state ,Excimer ,Photochemistry ,Acceptor - Abstract
triplet state is short. This significantly distinguishes energy transfer involving T* states from energy trans� fer involving the longlived triplet state Т1. The proba� bility of intermolecular Т-Т transfer is determined by exchange electron interaction (5), and it decreases exponentially with an increase in the distance between the energydonor and energyacceptor molecules. According to (1), the average distance of energy trans� fer from the high triplet state of octadeuterionaphtha� lene to toluene is ~6 A. In this work, we put forward an idea that the high efficiency of energy transfer from high triplet states observed in some systems is mainly due to formation of exciplexes between the energy donor and acceptor. The efficiency of energy transfer from high triplet levels of the donor molecule to acceptor molecules, which are usually solvent (matrix) molecules, is char�
- Published
- 2013
- Full Text
- View/download PDF
147. Averaging method for discrete systems and its application to control problems
- Author
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L. I. Plotnikova, V. A. Plotnikov, and A. T. Yarovoi
- Subjects
Discrete system ,Mathematical optimization ,Discrete equation ,Mathematics (miscellaneous) ,Partial differential equation ,Basis (linear algebra) ,Ordinary differential equation ,Applied mathematics ,Control (linguistics) ,Optimal control ,Mathematics ,Method of averaging - Abstract
We propose and justify algorithms for partial and complete averaging of systems of discrete equations and inclusions. On the basis of the averaging schemes obtained, we construct algorithms for the numerical asymptotic solution of problems of optimal control for discrete systems.
- Published
- 2004
- Full Text
- View/download PDF
148. Reconstruction of the 5000 Plate Mill at Severstal'
- Author
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V. A. Plotnikov, Yu. N. Belobrov, and Yu. G. Bondar
- Subjects
Materials science ,Mechanics of Materials ,Metallic materials ,Metallurgy ,Materials Chemistry ,Metals and Alloys ,Mill ,Condensed Matter Physics - Published
- 2003
- Full Text
- View/download PDF
149. Analysis of frost resistance of winter barley cultivars by comparing freezing survival of whole plants and the hygroscopicity of mature grain
- Author
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N. V. Serkin, V. K. Plotnikov, and Ya. Yu. Evtushenko
- Subjects
Resistance (ecology) ,Chemistry ,fungi ,food and beverages ,Magnesium salt ,Plant physiology ,Plant Science ,eye diseases ,Water retention ,Agronomy ,Volume (thermodynamics) ,medicine ,Frost (temperature) ,Hordeum vulgare ,Cultivar ,medicine.symptom - Abstract
Frost resistance of winter barley (Hordeum vulgare L.) cultivars was found related to water retention capacity (hygroscopicity) of mature grain. With an example of 17 cultivars, it was shown that the higher is frost resistance the lower is the volume of supernatant liquid extracted from ground barley grains with a magnesium salt solution. Comparative assessment of frost resistance from the freezing survival of whole plants in refrigerating chambers and from hygroscopicity of mature grain has shown that these two methods produce similar data. At the same time, the proposed new method of assessing frost resistance is considerably simpler and economically more efficient than the method of whole plant freezing.
- Published
- 2012
- Full Text
- View/download PDF
150. [Untitled]
- Author
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V P Plotnikov, A V Chogovadze, B A Poliaev, and Ivanova Ge
- Subjects
Dystonia ,Physiology ,business.industry ,Healthy subjects ,Human physiology ,Isometric exercise ,medicine.disease ,Diastolic arterial pressure ,Physiology (medical) ,Muscle tension ,Anesthesia ,Medicine ,In patient ,business ,Female students - Abstract
Cardiovascular responses to isometric tensions of small and large muscle groups under loads at 10, 20, or 30% of the maximum voluntary strength were studied in healthy female students and in their counterparts with neurocirculatory dystonia. It was found that the systolic and diastolic arterial pressure can either increase or decrease in response to these loads (pressor or depressor effects, respectively).
- Published
- 2002
- Full Text
- View/download PDF
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