1,412 research outputs found
Planets of the solar system
Venera and Mariner spacecraft and ground based radio astronomy and spectroscopic observations of the atmosphere and surface of venus are examined. The composition and structural parameters of the atmosphere are discussed as the basis for development of models and theories of the vertical structure of the atmosphere, the greenhouse effect, atmospheric circulation and cloud cover. Recommendations for further meteorological studies are given. Ground based and Pioneer satellite observation data on Jupiter are explored as well as calculations and models of the cloud structure, atmospheric circulation and thermal emission field of Jupiter
Mechanisms of water-salt metabolism disturbances in dogs subjected to six month hypokinesia
Water-salt metabolism in dogs during prolonged restricted motor activity (hypokinesia) was investigated. It was found that hydration occurred and fluid was redistributed between the extra- and intra-cellular sectors. Also, electrolyte excretion rose, and magnetism and calcium metabolism changed significantly. It is concluded that the forces caused by muscle strain proper (which was decreased under conditions of hypokinesia) influence the state of bone metabolism
The effect of hypodynamia on mineral and protein metabolism in calcified tissues of the maxillodental system (experimental radioisotope study)
Mineral and protein metabolism was studied in experiments on 60 white rats, using P-32 and Ca-45 uptake in the mineral fractions, 2C-14-glycine in the protein fractions, and P-32 in both fractions of calcified tissues as indices over a 100 day period of experimental hypodynamia. Combined alterations in mineral and protein metabolism occurred in the calcified tissues of the experimental animals. The most pronounced changes were found in P-32 and 2C-14-glycine metabolism. In the incisors and femoral bones, these alterations occurred in two phases: P-32 and 2C-14-glycine uptake first increased, then decreased. Changes in Ca-45 metabolism were less pronounced, particularly in the initial period of the experiment. A marked reduction in P-32, Ca-45, and 2C-14-glycine uptake was found in various fractions of the calcified tissues on the 100th day of experimental hypodynamia
Dynamic study on fusion reactions for Ca+Zr around Coulomb barrier
By using the updated improved Quantum Molecular Dynamics model in which a
surface-symmetry potential term has been introduced for the first time, the
excitation functions for fusion reactions of Ca+Zr at
energies around the Coulomb barrier have been studied. The experimental data of
the fusion cross sections for Ca+Zr have been reproduced
remarkably well without introducing any new parameters. The fusion cross
sections for the neutron-rich fusion reactions of Ca+Zr around
the Coulomb barrier are predicted to be enhanced compared with a
non-neutron-rich fusion reaction. In order to clarify the mechanism of the
enhancement of the fusion cross sections for neutron-rich nuclear fusions, we
pay a great attention to study the dynamic lowering of the Coulomb barrier
during a neck formation. The isospin effect on the barrier lowering is
investigated. It is interesting that the effect of the projectile and target
nuclear structure on fusion dynamics can be revealed to a certain extent in our
approach. The time evolution of the N/Z ratio at the neck region has been
firstly illustrated. A large enhancement of the N/Z ratio at neck region for
neutron-rich nuclear fusion reactions is found.Comment: 21 pages, 7 figures,3 table
Neutron star composition in strong magnetic fields
We study the problem of neutron star composition in the presence of a strong
magnetic field. The effects of the anomalous magnetic moments of both nucleons
and electrons are investigated in relativistic mean field calculations for a
-equilibrium system. Since neutrons are fully spin polarized in a large
field, generally speaking, the proton fraction can never exceed the field free
case. An extremely strong magnetic field may lead to a pure neutron matter
instead of a proton-rich matter.Comment: 12 pages, 3 postscript files include
Resultados preliminares de la primera expedición organizada dentro del programa del experimento complejo de energética atmosférica (CENEX - 70)
Спорные термины в анестезиологии и реаниматологии
Medical vocabulary is a part of the Russian language used by the professional community. Most of the terms are borrowed from other languages and poorly understood by most native speakers. The development of medicine, in particular, anesthesiology and resuscitation, leads to the emergence of many new conditions, symptoms, syndromes and their defnitions. The latter often cause controversy among doctors. The article is devoted to some aspects of the appearance of controversial terms in anesthesiology and resuscitation to discuss them.Медицинская лексика – часть русского языка, используемая профессиональным сообществом. Большинство отечественных медицинских терминов заимствованы из других языков и малопонятны большинству носителей языка. Развитие медицины, в частности анестезиологии и реаниматологии, приводит к появлению множества новых симптомов, синдромов, методов интенсивной терапии и, соответственно, их номинации, оформление и содержание которой нередко вызывают недопонимание и споры среди врачей. Статья посвящена обсуждению отдельных аспектов трактовки терминов в анестезиологии и реаниматологии, вызывающих наиболее частые разногласия в последнее время
Biological Earth observation with animal sensors.
Space-based tracking technology using low-cost miniature tags is now delivering data on fine-scale animal movement at near-global scale. Linked with remotely sensed environmental data, this offers a biological lens on habitat integrity and connectivity for conservation and human health; a global network of animal sentinels of environmen-tal change
Accessing the strong interaction between Λ baryons and charged kaons with the femtoscopy technique at the LHC
The interaction between Λ baryons and kaons/antikaons is a crucial ingredient for the strangeness S=0 and S=-2 sector of the meson–baryon interaction at low energies. In particular, the Lambda-Kbar might help in understanding the origin of states such as the Csi(1620), whose nature and properties are still under debate. Experimental data on Lambda-K and Lambda-Kbar systems are scarce, leading to large uncertainties and tension between the available theoretical predictions constrained by such data. In this Letter we present the measurements of Λ–KK− and Λ–KK+ correlations obtained in the high-multiplicity triggered data sample in pp collisions at sqrt(s) = 13 TeV recorded by ALICE at the LHC. The correlation function for both pairs is modeled using the Lednický–Lyuboshits analytical formula and the corresponding scattering parameters are extracted. The Λ–KK+ correlations show the presence of several structures at relative momenta k* above 200 MeV/c, compatible with the Ω baryon, the , and resonances decaying into Λ–K− pairs. The low k* region in the Λ–KK+ also exhibits the presence of the state, expected to strongly couple to the measured pair. The presented data allow to access the ΛK+ and ΛK− strong interaction with an unprecedented precision and deliver the first experimental observation of the decaying into ΛK−
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