188 research outputs found
Editorial for special issue on neurodynamics
No full text“Neurodynamics” is an interdisciplinary area of mathematics where dynamical systems theory (deterministic and stochastic) is the primary tool for elucidating the fundamental mechanisms responsible for the behaviour of neural systems (whether biological or synthetic). A meeting on this topic was held at the International Centre for Mathematical Sciences in Edinburgh from March 5–7 in 2012. In this special issue, we have invited seven of the main contributors to this event to expand on their presentations and highlight the use of mathematics in understanding the dynamics of neural systems
2011-2012 Lynn Philharmonia No. 3
No full text2011 Concerto Competition Winners December 3, 2011 at 7:30 PM and December 4, 2011 at 4:00 PM Bruce Polay, guest conductor ; Heqing Huang, piano ; Doniyor Zuparov, cello ; Chun Yu Tsai, marimba ; Anastasiya Timofeeva, piano Overture to Rienzi / Richard Wagner -- Piano Concerto No. 1 in C Major, op. 15 / Ludwig van Beethoven -- Cello Concerto No. 1 in E-flat Major, op. 107 / Dmitri Shostakovich -- Concerto for Marimba and String Orchestra / Emmanuel Séjourné -- Piano Concerto No. 1 in B-flat Minor, op. 23 / Pyotr Ilyich Tchaikovsky
2011-2012 Philharmonia Season Programhttps://spiral.lynn.edu/conservatory_philharmonia/1021/thumbnail.jp
To the question about the determinations of the terrorism in the works of the foreign jurisprudents
No full textThe Article is dedicated to study of the problem, undoubtedly actual and significant, which will promote the production of the ways of the fight with International Terrorism. The Author addresses to analysis one of a such aspect of the problem - a question about the base determination of the notion «terrorism» on foundation of the study of the multiple scientific works of the foreign jurisprudents, that has allowed to show the differences in the determinations of the Terrorism nowadays
Educational reading of Siberian and Far Eastern population in the late XX - early XXI centuries
No full textThe article is devoted to reading modification, which is most widespread today, educational reading. For the first time educational reading of Siberian and Far Eastern residents became a subject of an independent research. Its importance to develop a personality, society, state is reasoned. The author considers the corpus making educational reading, to which refers textbooks, manuals, reference books, encyclopedias, fiction according to school curricula and other editions that addressing is related to educational activity. The audience of educational reading is revealed and characterized, its age and gender structure is defined. Children, teenagers, youth entered it by age criterion, mainly women by a gender one. Pupils made the most group of users of municipal and state libraries on number. Among them senior school children more often addressed to libraries for preparation to classes. Requests for educational literature averaged from 60 to 90% of all requirements in municipal libraries of the region. Author's definitions of the term «educational reading» are offered to a scientific community for discussion.</jats:p
Nanofluids for heat exchanger improvement: a numerical approach
No full textMestrado em Engenharia MecânicaNo panorama industrial, as últimas décadas ficaram marcadas pelo aparecimento do conceito de sustentabilidade, consequência da crescente escassez de recursos e o desaparecimento de ecossistemas. Os resultados da poluição excessiva têm sido notórios, como o buraco do ozono ou a intensificação de fenómenos meteorológicos adversos comprovam. Cientes da aproximação a um ponto de irreversibilidade, governos e indústrias perseguem o objectivo comum de proteger o ambiente e racionalizar consumos energéticos, com vista a garantir a sobrevivência das gerações futuras. Permutadores de calor desempenham um papel fundamental no aquecimento, arrefecimento e recuperação energética, tendo também sido alvo da implementação de medidas que promovem o aumento da sua eficiência com vista a contribuir para a sustentabilidade dos sistemas térmicos nos quais operam. A principal limitação dos actuais permutadores é o baixo desempenho calorífico dos fluidos operantes tipicamente empregues, como óleo, glicóis ou água. De forma a preencher esta lacuna, surgiram recentemente os nanofluidos, suspensões de nanopartículas, possuidores de melhores propriedades de transferência de calor, em fluidos comuns. Estes revelam aumentos substanciais no desempenho, permitindo antever um aumento da eficiência dos dispositivos quando aplicado. De momento, o desconhecimento dos parâmetros mais influentes para a transferência anómala de calor, está a restringir a sua aplicabilidade industrial. Para o estudo da transferência de calor, por convecção, de um nanofluido, composto por água destilada e nanotubos de carbono, um modelo numérico é proposto e validado com base em dados experimentais. As propriedades mais relevantes dos fluidos em estudos desta natureza, o coeficiente de convecção e o número de Nusselt, são obtidos através da análise ao escoamento no interior de um tubo aquecido (aço inox). Os dados obtidos para o nanofluido são posteriormente comparados aos valores correspondentes para a água destilada e às correlações teóricas comuns. Propõe-se, adicionalmente, o estudo e debate do contributo de alguns dos mecanismos comuns à transferência de calor, por intermédio de testes paramétricos individuais.In the industrial panorama, the last decades have been marked by the advent of the concept of sustainability, consequence of growing resource scarcity and ecosystem destruction. Excessive pollution has led to notorious concerns, such as ozone layer depletion or severe climatic events. In order to guarantee the safety of future generations, governments and industries share the common goal of environment preservation and rational energy expenditure, before a point of no return is reached. Heat exchangers perform an important role in heating, cooling and heat recovery, having also been subjected to the implementation of measures that promote efficiency in order to ultimately contribute to the sustainability of the systems in which they operate. The main limitation of current exchangers is the poor heat transfer behaviour of common operating fluids, such as oil, glycols or water. In order to fulfil the requirement of improved fluid heat transfer, the recent advent of nanofluids, high heat transfer nanoparticle suspensions in base fluids, has taken place. These have displayed substantial heat transfer performances, allowing to foresee increases in device efficiency once applied. At present the mechanisms, responsible for the anomalous enhancements, remain unknown, thus restricting industrial applicability. For the convective heat transfer study of a nanofluid, with carbon nanotubes suspended in deionized water, a numerical model is proposed and validated based on experimental data. The relevant fluid properties used for such investigations, the heat transfer coefficient and the Nusselt number, are obtained for fluid flow through a heated tube (stainless steel). The acquired results for the nanofluid are then compared to the matching data for deionized water and to common theoretical correlations. Additionally, a study and debate concerning the contribution of typical heat transfer mechanisms, evaluated individually under parametric testing, is proposed
Vasily Dokuchaev (to the 175-th anniversary)
No full textThe idea of this paper is to highlight the scale of Dokuchaev's personality through the prism of readers' perception and comparison of the scientist's achievements, timed to certain milestones in his life, with their own successes. Dokuchaev's biography, filtered through his own life experience, provides a better understanding of the magnitude of the first soil scientist, and a respect for his significant scientific heritage. The work will give an insight into the extensive and varied activities of the pioneer in the comprehensive study of soils and the environment
Investigation of Antibiotic Resistance of E. coli Associated with Farm Animal Feces with Participation of Citizen Scientists
No full textThis paper presents the findings of a large-scale study on antibiotic resistance in bacteria found in farm animal feces across Russia. The study included 6578 samples of farm animal manure from 13 regions in Russia, with the help of citizen scientists. Molecular and microbiological methods were used to analyze 1111 samples of E. coli. The microbiological analysis focused on culturing the microorganisms present in the fecal samples on selective media for E. coli and evaluating the sensitivity of the bacteria to different antibiotics, including ampicillin, tetracycline, chloramphenicol, cefotaxime, and ciprofloxacin. The molecular analysis involved isolating the genomic DNA of the bacteria and conducting PCR assays to detect the vanA, vanB, and mcr-1 antibiotic resistance genes. The results demonstrated significant differences in antibiotic sensitivity of the samples that are morphologically identical to E. coli from different regions. For example, 98.0% and 82.5% of E. coli and other fecal bacterial isolates from the Omsk and Vologda regions lacked antibiotic resistance genes, while 97.7% of samples from the Voronezh region possessed three resistance genes simultaneously. The phenotypic antibiotic sensitivity test also revealed regional differences. For instance, 98.1% of fecal bacterial samples from cattle in the Udmurt Republic were sensitive to all five antibiotics tested, whereas 92.8% of samples from the Voronezh region showed resistance to all five antibiotics. The high level of antibiotic resistance observed may be attributed to their use in farming practices. The distinctive feature of our research is that comprehensive geographical coverage was achieved by using a citizen science platform. Citizen scientists, specifically students from colleges and universities, were responsible for the collection and initial analysis of samples. The project attracted 3096 student participants, enabling the collection and analysis of a significant number of samples from various locations in Russia
The X-ray Investigation of 16α,17α-Thiazolidine Derivatives of Δ4- and Δ5-Pregnanes and Conformational Analysis of their Oxathiolane Analog
No full textAn X-ray study of 3,20-dioxo-4-pregnene-[16α, 17α−d]- -2\u27,2\u27-dimethylthiazolidine (I) and 3β-hydroxy-20-oxo-5- -pregnene-[16α,17α−d]-2\u27,2\u27-dimethylthiazolidine (II) has been carried out.
Two independent molecules in crystal II have significantly different conformations of the D and E rings, although according to the atom-atom potential calculations the energy of interaction of these molecules with their neighbors in crystal is the same. The calculation of conformational energy of 3,20-dioxo-4-pregnene-[17α, 16α−d]-2\u27,2\u27- -dimethyloxathiolane (III) by the molecular mechanics method (MMM) indicates a possibility of existence of two similar conformers also for this molecule. The MMM calculation shows also that the conformation of molecule III (as well as progesterone) with the 17β-acetyl group torsion angle C(16)C(17)C(20)O(20) close to -120° is possible
Doklady Physics V.45, I.08
No full textDoklady Physics -- August 2000
Volume 45, Issue 8, pp. 359-433
PHYSICS
Association in Metallic Melts and Its Relation to Amorphization: Fe–P Alloys
A. I. Zaitsev, N. E. Shelkova, and A. D. Litvina
pp. 359-362 Full Text: PDF (52 kB)
Studies of Mechanical Properties of Quasicrystalline Al–Cu–Fe Phase by the Indentation Technique
V. I. Trefilov, Yu. V. Mil'man, D. V. Lotsko, A. N. Belous, S. I. Chugunova, I. I. Timofeeva, and A. I. Bykov
pp. 363-366 Full Text: PDF (101 kB)
Parabolic Approximation in the Theory of the Sound Propagation in Three-Dimensionally Heterogeneous Media
O. A. Godin
pp. 367-371 Full Text: PDF (65 kB)
Generalized Equation for Inverse Population in a Laser Active Medium
A. L. Mikaelyan and Yu. G. Turkov
pp. 372-375 Full Text: PDF (55 kB)
Self-Organization Processes in a System of Magnetic Moments in Polycrystals
V. K. Karpasyuk and E. I. Beznisko
pp. 376-379 Full Text: PDF (64 kB)
Phonon Spectra for Crystal Lattices of V, Cr, Mn, Fe, Co, Ni, and Cu
N. N. Sirota, I. M. Sirota, T. M. Soshnina, and T. D. Sokolovskii
pp. 380-383 Full Text: PDF (68 kB)
Experimental Study of Inelastic Collisions of Low-Velocity Electrons with Terbium Atoms
Yu. M. Smirnov
pp. 384-388 Full Text: PDF (61 kB)
POWER ENGINEERING
Bifurcation of Vortex Turbulent Flow and Intensification of Heat Transfer in a Hollow
S. A. Isaev, A. I. Leont'ev, P. A. Baranov, and A. E. Usachev
pp. 389-391 Full Text: PDF (104 kB)
MECHANICS
A Method of Transferring Boundary Conditions by Cauchy–Krylov Functions for Rigid Linear Ordinary Differential Equations
A. Yu. Vinogradov and Yu. A. Vinogradov
pp. 392-394 Full Text: PDF (45 kB)
Amplification of a Shock Wave in a Saturated Porous Medium
V. E. Nakoryakov and V. E. Dontsov
pp. 395-396 Full Text: PDF (37 kB)
Effect of Oriented Elastic and Strength Characteristics on the Impact Fracture of Anisotropic Materials
A. V. Radchenko and S. V. Kobenko
pp. 397-400 Full Text: PDF (76 kB)
Solving the Boltzmann Equation in the Case of Passing to the Hydrodynamic Flow Regime
F. G. Cheremisin
pp. 401-404 Full Text: PDF (74 kB)
An Isobaric–Isothermal Ensemble in Statistical Mechanics
K. M. Magomedov
pp. 405-409 Full Text: PDF (73 kB)
On Singularities of Boundaries for Parametric Resonance
A. A. Mailybaev and A. P. Seiranyan
pp. 410-414 Full Text: PDF (77 kB)
Structure of Solutions to Linear Unsteady Boundary Value Problems in Mechanics and Mathematical Physics
A. D. Polyanin
pp. 415-418 Full Text: PDF (55 kB)
On Invariants of the Stress–Strain State in Mathematical Models for Mechanics of Continua
E. I. Shemyakin
pp. 419-421 Full Text: PDF (42 kB)
Undular Bore in the Counterflow
V. I. Bukreev
pp. 422-424 Full Text: PDF (297 kB)
Integration of Equations for Long Waves in the Drozdova–Kulikovskii Form
A. G. Petrov
pp. 425-429 Full Text: PDF (72 kB)
Macrostructure and Microstructure of a Cocurrent Stratified Flow behind a Cylinder
Yu. D. Chashechkin and V. V. Mitkin
pp. 430-433 Full Text: PDF (117 kB)Archived web conten
Doklady Physics V.45, I.08
No full textDoklady Physics -- August 2000
Volume 45, Issue 8, pp. 359-433
PHYSICS
Association in Metallic Melts and Its Relation to Amorphization: Fe–P Alloys
A. I. Zaitsev, N. E. Shelkova, and A. D. Litvina
pp. 359-362 Full Text: PDF (52 kB)
Studies of Mechanical Properties of Quasicrystalline Al–Cu–Fe Phase by the Indentation Technique
V. I. Trefilov, Yu. V. Mil'man, D. V. Lotsko, A. N. Belous, S. I. Chugunova, I. I. Timofeeva, and A. I. Bykov
pp. 363-366 Full Text: PDF (101 kB)
Parabolic Approximation in the Theory of the Sound Propagation in Three-Dimensionally Heterogeneous Media
O. A. Godin
pp. 367-371 Full Text: PDF (65 kB)
Generalized Equation for Inverse Population in a Laser Active Medium
A. L. Mikaelyan and Yu. G. Turkov
pp. 372-375 Full Text: PDF (55 kB)
Self-Organization Processes in a System of Magnetic Moments in Polycrystals
V. K. Karpasyuk and E. I. Beznisko
pp. 376-379 Full Text: PDF (64 kB)
Phonon Spectra for Crystal Lattices of V, Cr, Mn, Fe, Co, Ni, and Cu
N. N. Sirota, I. M. Sirota, T. M. Soshnina, and T. D. Sokolovskii
pp. 380-383 Full Text: PDF (68 kB)
Experimental Study of Inelastic Collisions of Low-Velocity Electrons with Terbium Atoms
Yu. M. Smirnov
pp. 384-388 Full Text: PDF (61 kB)
POWER ENGINEERING
Bifurcation of Vortex Turbulent Flow and Intensification of Heat Transfer in a Hollow
S. A. Isaev, A. I. Leont'ev, P. A. Baranov, and A. E. Usachev
pp. 389-391 Full Text: PDF (104 kB)
MECHANICS
A Method of Transferring Boundary Conditions by Cauchy–Krylov Functions for Rigid Linear Ordinary Differential Equations
A. Yu. Vinogradov and Yu. A. Vinogradov
pp. 392-394 Full Text: PDF (45 kB)
Amplification of a Shock Wave in a Saturated Porous Medium
V. E. Nakoryakov and V. E. Dontsov
pp. 395-396 Full Text: PDF (37 kB)
Effect of Oriented Elastic and Strength Characteristics on the Impact Fracture of Anisotropic Materials
A. V. Radchenko and S. V. Kobenko
pp. 397-400 Full Text: PDF (76 kB)
Solving the Boltzmann Equation in the Case of Passing to the Hydrodynamic Flow Regime
F. G. Cheremisin
pp. 401-404 Full Text: PDF (74 kB)
An Isobaric–Isothermal Ensemble in Statistical Mechanics
K. M. Magomedov
pp. 405-409 Full Text: PDF (73 kB)
On Singularities of Boundaries for Parametric Resonance
A. A. Mailybaev and A. P. Seiranyan
pp. 410-414 Full Text: PDF (77 kB)
Structure of Solutions to Linear Unsteady Boundary Value Problems in Mechanics and Mathematical Physics
A. D. Polyanin
pp. 415-418 Full Text: PDF (55 kB)
On Invariants of the Stress–Strain State in Mathematical Models for Mechanics of Continua
E. I. Shemyakin
pp. 419-421 Full Text: PDF (42 kB)
Undular Bore in the Counterflow
V. I. Bukreev
pp. 422-424 Full Text: PDF (297 kB)
Integration of Equations for Long Waves in the Drozdova–Kulikovskii Form
A. G. Petrov
pp. 425-429 Full Text: PDF (72 kB)
Macrostructure and Microstructure of a Cocurrent Stratified Flow behind a Cylinder
Yu. D. Chashechkin and V. V. Mitkin
pp. 430-433 Full Text: PDF (117 kB)Archived web conten
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