Carrier-induced refractive index in quantum dot structures due to transitions from discrete quantum dot levels to continuum states

The carrier-induced refractive index in quantum dot (QD) structures due to optical transitions from QD levels to continuum states is considered. It is shown that, for large photon energies, the refractive index change is given asymptotically by the Drude formula. Calculations of the linewidth enhancement factor, alpha, show that alphasimilar to1 due to this contribution to the total refractive index. Furthermore, for highly localized QD states, the absorption coefficient at the photon energies similar to0.8-1.0 eV due to these transitions can be on the order of 10(3) m(-1). (C) 2004 American Institute of Physics. (DOI: 10.1063/1.1639933

Dynamics of light propagation in spatiotemporal dielectric structures

Propagation, transmission and reflection properties of linearly polarized plane waves and arbitrarily short electromagnetic pulses in one-dimensional dispersionless dielectric media possessing an arbitrary space-time dependence of the refractive index are studied by using a two-component, highly symmetric version of Maxwell's equations. The use of any slow varying amplitude approximation is avoided. Transfer matrices of sharp nonstationary interfaces are calculated explicitly, together with the amplitudes of all secondary waves produced in the scattering. Time-varying multilayer structures and spatiotemporal lenses in various configurations are investigated analytically and numerically in a unified approach. Several new effects are reported, such as pulse compression, broadening and spectral manipulation of pulses by a spatiotemporal lens, and the closure of the forbidden frequency gaps with the subsequent opening of wavenumber bandgaps in a generalized Bragg reflector

Broadening of Plasmonic Resonance Due to Electron Collisions with Nanoparticle Boundary: а Quantum Mechanical Consideration

We present a quantum mechanical approach to calculate broadening of plasmonic resonances in metallic nanostructures due to collisions of electrons with the surface of the structure. The approach is applicable if the characteristic size of the structure is much larger than the de Broglie electron wavelength in the metal. The approach can be used in studies of plasmonic properties of both single nanoparticles and arrays of nanoparticles.Comment: 9 page

Острая респираторная вирусная инфекция у детей: современные подходы к диагностике и лечению

The article is devoted to acute respiratory viral infections (ARVI) in children. ARVI take one of the leading places in a childhood morbidity structure. The article provides an overview of the clinical guidelines developed and approved by the professional association «Union of Pediatricians of Russia» for acute respiratory infections in children. These guidelines summarize the experience of the leading world and domestic specialists, contain scientific and practical data that correspond to the most relevant trends in the management of children with this pathology. The authors present modern information on the etiology, pathogenesis, classification, clinical findings and differential diagnosis of various nosological forms of acute respiratory tract infections in the pediatric population. The general (strategic) principles of drug-free and drug treatment are discussed in detail.Статья посвящена острым респираторным вирусным инфекциям (ОРВИ) у детей. ОРВИ занимают одно из лидирующих мест в структуре детской заболеваемости. В публикации представлен обзор разработанных и утвержденных профессиональной ассоциацией «Союз педиатров России» клинических рекомендаций по острым респираторным инфекциям у детей. Настоящие рекомендации обобщают опыт ведущих мировых и отечественных специалистов, содержат научно- практические данные, соответствующие самым актуальным тенденциям ведения пациентов детского возраста с данной патологией. Авторами представлены современные сведения об этиологии, патогенезе, классификации, клинике и дифференциальной диагностике различных нозологических форм острых инфекций дыхательных путей в детской популяции, подробно рассмотрены общие (стратегические) принципы немедикаментозного и медикаментозного лечения.

Acute Respiratory Viral Infection in Children: Modern Approaches to Diagnosis and Treatment

The article is devoted to acute respiratory viral infections (ARVI) in children. ARVI take one of the leading places in a childhood morbidity structure. The article provides an overview of the clinical guidelines developed and approved by the professional association «Union of Pediatricians of Russia» for acute respiratory infections in children. These guidelines summarize the experience of the leading world and domestic specialists, contain scientific and practical data that correspond to the most relevant trends in the management of children with this pathology. The authors present modern information on the etiology, pathogenesis, classification, clinical findings and differential diagnosis of various nosological forms of acute respiratory tract infections in the pediatric population. The general (strategic) principles of drug-free and drug treatment are discussed in detail

Management of Children with Disease Caused by New Coronaviral Infection (SARS-CoV-2)

The Ministry of Health of the Russian Federation jointly with professional association and experts in the field of pediatrics, infectious diseases and resuscitation has developed guidelines “Clinical Features and Management of the Disease Caused by New Coronaviral Infection (COVID-19) in Children” in order to provide the child population with effective medical care during the pandemic of the new coronaviral infection. The practical experience of specialists from various countries was considered during the development of this document. Special attention should be given to the evidence base of the presented data, as well as to the efficiency and safety issues of medications used in treatment of coronaviral infection and its complications. The authors highlight the problems of prevention, diagnostics and management of pathological conditions caused by COVID-19 in the article according to the presented guidelines. Patient’s management is presented depending on the age and severity of the disease itself. The therapy is considered with regard to etiological, pathogenetic and symptom focus

Ведение детей с заболеванием, вызванным новой коронавирусной инфекцией (SARS-CoV-2)

The Ministry of Health of the Russian Federation jointly with professional association and experts in the field of pediatrics, infectious diseases and resuscitation has developed guidelines “Clinical Features and Management of the Disease Caused by New Coronaviral Infection (COVID-19) in Children” in order to provide the child population with effective medical care during the pandemic of the new coronaviral infection. The practical experience of specialists from various countries was considered during the development of this document. Special attention should be given to the evidence base of the presented data, as well as to the efficiency and safety issues of medications used in treatment of coronaviral infection and its complications. The authors highlight the problems of prevention, diagnostics and management of pathological conditions caused by COVID-19 in the article according to the presented guidelines. Patient’s management is presented depending on the age and severity of the disease itself. The therapy is considered with regard to etiological, pathogenetic and symptom focus.С целью обеспечения детского населения эффективной медицинской помощью в условиях пандемии новой коронавирусной инфекции Минздравом России совместно с профессиональными ассоциациями и экспертами в области педиатрии, инфекционных болезней и реанимации разработаны методические рекомендации «Особенности клинических проявлений и лечения заболевания, вызванного новой коронавирусной инфекцией (COVID-19), у детей». При разработке документа был учтен практический опыт специалистов не только нашей страны, но и зарубежных коллег. Особое внимание уделено доказательной базе представленных данных, а также вопросам эффективности и безопасности лекарственных препаратов, применяемых при лечении данной инфекции и ее осложнений. В статье на основании указанных методических рекомендации авторы освещают вопросы профилактики, диагностики, лечения патологических состояний, обусловленных COVID-19. Тактика ведения пациента представлена в зависимости от возраста и степени тяжести течения болезни, терапия рассмотрена с позиции этиологической, патогенетической и симптоматической направленности

Clinical Features and Management of the Disease Caused by New Coronaviral Infection (COVID-19) in Children. Version 2

The Ministry of Health of the Russian Federation jointly with professional association and experts in the field of pediatrics, infectious diseases and resuscitation has revised guidelines “Clinical Features and Management of the Disease Caused by New Coronaviral Infection (COVID-19) in Children” in order to provide the child population with effective medical care during the pandemic of the new coronaviral infection. The practical experience of specialists from various countries was considered during the development of this document. Special attention should be given to the evidence base of the presented data, as well as to the efficiency and safety issues of medications used in treatment of coronaviral infection and its complications. The authors highlight the problems of prevention, diagnostics and management of pathological conditions caused by COVID-19 in the article according to the presented guidelines. Patient’s management is presented depending on the age and severity of the disease itself. The therapy is considered with regard to etiological, pathogenetic and symptom focus

Особенности клинических проявлений и лечения заболевания, вызванного новой коронавирусной инфекцией (COVID-19), у детей. Версия 2

The Ministry of Health of the Russian Federation jointly with professional association and experts in the field of pediatrics, infectious diseases and resuscitation has revised guidelines “Clinical Features and Management of the Disease Caused by New Coronaviral Infection (COVID-19) in Children” in order to provide the child population with effective medical care during the pandemic of the new coronaviral infection. The practical experience of specialists from various countries was considered during the development of this document. Special attention should be given to the evidence base of the presented data, as well as to the efficiency and safety issues of medications used in treatment of coronaviral infection and its complications. The authors highlight the problems of prevention, diagnostics and management of pathological conditions caused by COVID-19 in the article according to the presented guidelines. Patient’s management is presented depending on the age and severity of the disease itself. The therapy is considered with regard to etiological, pathogenetic and symptom focus.С целью обеспечения детского населения эффективной медицинской помощью в условиях пандемии новой коронавирусной инфекции Минздравом России совместно с профессиональными ассоциациями и экспертами в области педиатрии, инфекционных болезней и реанимации были переработаны методические рекомендации «Особенности клинических проявлений и лечения заболевания, вызванного новой коронавирусной инфекцией (COVID-19), у детей». При разработке документа был учтен практический опыт не только специалистов нашей страны, но и зарубежных коллег. Особое внимание уделено доказательной базе представленных данных, а также вопросам эффективности и безопасности лекарственных препаратов, применяемых при лечении данной инфекции и ее осложнений. В статье на основании указанных методических рекомендаций авторы освещают вопросы профилактики, диагностики, лечения патологических состояний, обусловленных COVID-19. Тактика ведения пациента представлена в зависимости от возраста и степени тяжести течения болезни, терапия рассмотрена с позиций этиологической, патогенетической и симптоматической направленности