3,169 research outputs found
Effect of Acute Heat Stress on Some Hematological Parameters, Trace Elements and Meat Quality in Rabbits
The aim of the present study was to investigate the effect of acute heat stress on some hematological parameters, trace elements and meat quality traits in rabbits. Twelve male rabbits at the age of 4 months were allocated into 2 groups: control and experimental. The experimental rabbits were exposed to intermittent solar radiation for 4 hours at 36 Β°C. The following parameters were determined: white blood cells (WBC) count, red blood cells (RBC) count, hematocrit, neutrophil and lymphocyte percentages, liver and meat content of chromium (Cr) and selenium (Se), pH of meat at 60 min and 24 h post mortem, meat color, myoglobin and water holding capacity (WHC). Exposure to heat increased neutrophil to lymphocyte ratio (P<0.01) and liver content of Cr (P<0.01), while WBC count, RBC count, hematocrit, liver Se, muscle Cr and Se, pH of meat at 24 h, meat color, myoglobin and WHC were not affected by the applied heat load. The experimental rabbits had significantly lower meat pH at 60 min after slaughter relative to the control rabbits (P<0.05).
It was suggested that experimental rabbits had sufficient muscle glycogen at the time of slaughter needed to produce the lactic acid that reduced the ultimate pH of post-mortem muscle within the range observed in the control rabbits
Microbiological evaluation of sewage sludge in terms of possibilities of application in soil as a fertilizer
Research was conducted of sewage sludge from wastewater treatment plant for the
existence of microorganisms of several major groups, containing pathogenic
representatives with epizootological significance (Gram-negative aerobic bacteria,
E. coli, Clostridium perfringens, the genera Pseudomonas, Staphylococcus,
Enterococcus, fungi, and the total number of microorganisms), in order to assess
the environmental safety of the final product. In parallel similar studies were made
of fresh and composted cattle manures. A comparison of the results was made with
the ready for manuring compost in order to assess the possibilities for the use of
sludge for fertilizing. The quantities of microorganisms were given in CFU per 1 g
of the investigated material, as well as per 1 g of dry substance for each of them. In
our opinion this new approach to the reporting of the results per unit of dry matter
of the investigated materials, allows for a more accurate comparison. It was found
that the examined sewage sludge from wastewater treatment plant were rich in
microorganisms from studied groups and their direct application in soils without
prior treatment by aerobic or anaerobic digestion may represent epidemiological
danger
Optical spectra, crystal-field parameters, and magnetic susceptibility of the new multiferroic NdFe3(BO3)4
We report high-resolution optical absorption spectra for NdFe3(BO3)4 trigonal
single crystal which is known to exhibit a giant magnetoelectric effect below
the temperature of magnetic ordering TN = 33 K. The analysis of the
temperature-dependent polarized spectra reveals the energies and, in some
cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We
perform crystal-field calculations starting from the exchange-charge model,
obtain a set of six real crystal-field parameters, and calculate wave functions
and magnetic g-factors. In particular, the values g(perpendicular) = 2.385,
g(parallel) = 1.376 were found for the Nd3+ ground-state doublet. We obtain
Bloc=7.88 T and |JFN|= 0.48 K for the values of the local effective magnetic
field at liquid helium temperatures at the Nd3+ site and the Nd - Fe exchange
integral, respectively, using the experimentally measured Nd3+ ground-state
splitting of 8.8 cm-1. To check reliability of our set of crystal field
parameters we model the magnetic susceptibility data from literature. A dimer
containing two nearest-neighbor iron ions in the spiral chain is considered to
partly account for quasi-one-dimensional properties of iron borates, and then
the mean-field approximation is used. The results of calculations with the
exchange parameters for Fe3+ ions Jnn = -6.25 K (intra-chain interactions) and
Jnnn = -1.92 K (inter-chain interactions) obtained from fitting agree well with
the experimental data.Comment: 13 pages, 8 figures, 2 table
Risk factors for the preservation of morphological changes in the gastric mucosa after eradication therapy for Helicobacter pylori infection in children with chronic gastritis
We conducted a clinical, morphofunctional examination and standard treatment of 155 children with chronic gastroduodenitis associated with Helicobacter pylori (HP) infection. It was ΠΊevealed that after 6 months lymphoplasmacytic infiltration of the gastric mucosa (GM) preserved in 37% of cases, and unspecified atrophy - in 9%, increased C3 and C4 components of the compliment - in 19% of children, antroduodenal discoordination on the background of postprandial secretin and cholecystokinin level - in 25%, as well as disorders of the intestinal microbiot
Π€ΠΎΡΠΌΠ°Π»ΠΈΠ·ΠΎΠ²Π°Π½Π½ΡΠΉ ΠΏΠΎΠ΄Ρ ΠΎΠ΄ ΠΊ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΌΡ Π²Π½Π΅Π΄ΡΠ΅Π½ΠΈΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° ΡΠ΅Ρ Π½ΠΈΡΠ΅ΡΠΊΠΈΡ ΡΡΠ΅Π΄ΡΡΠ²
The research relates to the field of automation of technological preparation of production in transport equipment manufacturing sector and proposes the concept of choosing the optimal design model for a complex of technical means within a control system in automated production. The factors characterising the dynamics of the processes have been studied, and the corresponding mathematical models have been drawn up, considering the cost characteristics and the economic feasibility of adopting integratedtechnical means.The main objective of this work is to propose consideration of all parameters that have weight, including the dynamics of technical and economic processes. It is shown that cost characteristics are direct indicators of economic efficiency of the implemented complex of technical means.Methodically, this work was carried out based on economic and mathematical analysis of adoption of a complex of technical means at a transport equipment manufacturing enterprise considering approaches previously suggested by researchers.Thus, for the most accurate determination of the final cost of a certain product option, it is necessary to consider all factors of design decisions. Based on these data, a model of cost characteristics of products is built, analysing which it is possible to select the optimal product design, optimal assemblies and units with specific components and specific quality indicators. This allows obtaining the optimal technological version of the design solution during manufacturing.A method of searching for an optimal production cycle when introducing an automated production system is proposed. It is proposed to consider the losses associated with temporary freezing of funds, including the need to perform a convolution of optimization criteria. To formalise the process of making optimal decisions, it is also proposed to harmonise the products and market needs. Besides, the search methodology should include the search for an optimal group of employees responsible for implementation of specific and narrowly focused tasks, which makes it possible to improve the quality indicators of automated production with an adopted complex of technical means (CTM).To minimise the time spent on entire commissioning of a product from the development stage to receipt of the finished product, it is required to speed up the development work. This can be done by increasing production capacity, as well as by reducing the time of partial cycles of the structureβs existence.Even though the model is becoming excessively redundant, we suppose that introduction of additional elements is necessary to consider all the nuances that help choosing the best solution regarding optimisation issues, which will allow determining of the full economic efficiency of the complex.ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΎΡΠ½ΠΎΡΠΈΡΡΡ ΠΊ ΠΎΠ±Π»Π°ΡΡΠΈ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·Π°ΡΠΈΠΈ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠΈ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π° Π² ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠΌΠΌΠ°ΡΠΈΠ½ΠΎΡΡΡΠΎΠ΅Π½ΠΈΠΈ. Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π° ΠΊΠΎΠ½ΡΠ΅ΠΏΡΠΈΡ Π²ΡΠ±ΠΎΡΠ° ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΡΠΎΠ΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ΅Π΄ΡΡΠ² ΡΠΈΡΡΠ΅ΠΌΡ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π½Π° Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΌ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅. ΠΠ·ΡΡΠ΅Π½Ρ ΡΠ°ΠΊΡΠΎΡΡ, Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΡΡΠΈΠ΅ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΡ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ². Π‘ΠΎΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΠ΅ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠΎΠ΄Π΅Π»ΠΈ, ΡΡΠΈΡΡΠ²Π°ΡΡΠΈΠ΅ ΡΡΠΎΠΈΠΌΠΎΡΡΠ½ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΈ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΡΡ ΡΠ΅Π»Π΅ΡΠΎΠΎΠ±ΡΠ°Π·Π½ΠΎΡΡΡ Π²Π²ΠΎΠ΄Π° ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΡ
ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ΅Π΄ΡΡΠ².ΠΡΠ½ΠΎΠ²Π½Π°Ρ ΡΠ΅Π»Ρ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΡΠ²ΠΎΠ΄ΠΈΡΡΡ ΠΊ ΡΡΡΡΡ Π²ΡΠ΅Ρ
ΠΈΠΌΠ΅ΡΡΠΈΡ
Π²Π΅Ρ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ², Π² ΡΠΎΠΌ ΡΠΈΡΠ»Π΅ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΡΠ΅Ρ
Π½ΠΈΠΊΠΎ-ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ². ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΡΡΠΎΠΈΠΌΠΎΡΡΠ½ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ Π½Π°ΠΏΡΡΠΌΡΡ ΡΠ²Π»ΡΡΡΡΡ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΡΠΌΠΈ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ Π²Π½Π΅Π΄ΡΡΠ΅ΠΌΠΎΠ³ΠΎ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ΅Π΄ΡΡΠ².ΠΠ΅ΡΠΎΠ΄ΠΈΡΠ΅ΡΠΊΠΈ Π΄Π°Π½Π½Π°Ρ ΡΠ°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΠΊΠΎ-ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ΠΏΠΎ Π²Π½Π΅Π΄ΡΠ΅Π½ΠΈΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ΅Π΄ΡΡΠ² Π½Π° ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅Π½Π½ΠΎΠΌ ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΈ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎ-ΠΌΠ°ΡΠΈΠ½ΠΎΡΡΡΠΎΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΎΡΡΠ°ΡΠ»ΠΈ Ρ ΡΡΡΡΠΎΠΌ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½ΠΈΡ ΡΠ°Π½Π΅Π΅ ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΡΡ
Π² ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡΡ
ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ΠΎΠ².ΠΠ»Ρ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΡΠΎΡΠ½ΠΎΠ³ΠΎ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΊΠΎΠ½Π΅ΡΠ½ΠΎΠΉ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ½Π½ΠΎΠ³ΠΎ Π²Π°ΡΠΈΠ°Π½ΡΠ° ΠΈΠ·Π΄Π΅Π»ΠΈΡ, Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎ ΡΡΠΈΡΡΠ²Π°ΡΡ Π²ΡΠ΅ ΡΠ°ΠΊΡΠΎΡΡ ΠΏΡΠΎΠ΅ΠΊΡΠ½ΡΡ
ΡΠ΅ΡΠ΅Π½ΠΈΠΉ. ΠΠ° ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΠΈ ΡΡΠΈΡ
Π΄Π°Π½Π½ΡΡ
ΡΡΡΠΎΠΈΡΡΡ ΠΌΠΎΠ΄Π΅Π»Ρ ΡΡΠΎΠΈΠΌΠΎΡΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΈΠ·Π΄Π΅Π»ΠΈΠΉ, Π°Π½Π°Π»ΠΈΠ·ΠΈΡΡΡ ΠΊΠΎΡΠΎΡΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎ ΠΏΡΠΎΠΈΠ·Π²Π΅ΡΡΠΈ Π²ΡΠ±ΠΎΡ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΉ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ ΠΈΠ·Π΄Π΅Π»ΠΈΡ, ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΡ
ΡΠ·Π»ΠΎΠ² Ρ ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΡΠΌΠΈ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡΡΡΠΈΠΌΠΈ ΠΈ ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΡΠΌΠΈ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΡΠΌΠΈ ΠΊΠ°ΡΠ΅ΡΡΠ²Π°. ΠΡΠΎ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΏΠΎΠ»ΡΡΠΈΡΡ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠΉ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΉ Π²Π°ΡΠΈΠ°Π½Ρ ΠΏΡΠΎΠ΅ΠΊΡΠ½ΠΎΠ³ΠΎ ΡΠ΅ΡΠ΅Π½ΠΈΡ Π½Π° ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅.ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΠΏΠΎΠΈΡΠΊΠ° ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΠΈΠΊΠ»Π° ΠΏΡΠΈ Π²Π½Π΅Π΄ΡΠ΅Π½ΠΈΠΈ ΡΠΈΡΡΠ΅ΠΌΡ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π°. ΠΡΠ΅Π΄Π»Π°Π³Π°Π΅ΡΡΡ ΡΡΠΈΡΡΠ²Π°ΡΡ ΠΏΠΎΡΠ΅ΡΠΈ, ΡΠ²ΡΠ·Π°Π½Π½ΡΠ΅ Ρ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠΌ Π·Π°ΠΌΠΎΡΠ°ΠΆΠΈΠ²Π°Π½ΠΈΠ΅ΠΌ ΡΠΎΠ½Π΄ΠΎΠ², Π² ΡΠΎΠΌ ΡΠΈΡΠ»Π΅ ΠΏΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎ Π²ΡΠΏΠΎΠ»Π½ΡΡΡ ΡΠ²ΡΡΡΠΊΡ ΠΊΡΠΈΡΠ΅ΡΠΈΠ΅Π² ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ. ΠΠ»Ρ ΡΠΎΡΠΌΠ°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΠΏΡΠΎΡΠ΅ΡΡΠ° ΠΏΡΠΈΠ½ΡΡΠΈΡ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΡ
ΡΠ΅ΡΠ΅Π½ΠΈΠΉ ΡΠ°ΠΊΠΆΠ΅ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΡΡΡ ΡΠΎΠ³Π»Π°ΡΠΎΠ²ΡΠ²Π°ΡΡ Π²ΡΠΏΡΡΠΊΠ°Π΅ΠΌΡΡ ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΡ ΠΈ ΠΏΠΎΡΡΠ΅Π±Π½ΠΎΡΡΠΈ ΡΡΠ½ΠΊΠ°. ΠΡΠΎΠΌΠ΅ ΡΠΎΠ³ΠΎ, Π² ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΡ ΠΏΠΎΠΈΡΠΊΠ° Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎ Π²ΠΊΠ»ΡΡΠ°ΡΡ ΠΏΠΎΠΈΡΠΊ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΉ Π³ΡΡΠΏΠΏΡ ΡΠ°Π±ΠΎΡΠ½ΠΈΠΊΠΎΠ², ΠΎΡΠ²Π΅ΡΠ°ΡΡΠΈΡ
Π·Π° Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠ΅ ΠΊΠΎΠ½ΠΊΡΠ΅ΡΠ½ΡΡ
ΡΠ·ΠΊΠΎΠ½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΡΡ
Π·Π°Π΄Π°Ρ, ΡΡΠΎ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΡ ΠΏΠΎΠ²ΡΡΠΈΡΡ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ ΠΊΠ°ΡΠ΅ΡΡΠ²Π° Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π° Ρ Π²Π½Π΅Π΄ΡΡΠ½Π½ΡΠΌ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠΎΠΌ ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ΅Π΄ΡΡΠ² (ΠΠ’Π‘).Π‘ ΡΠ΅Π»ΡΡ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΠΊΡΠ°ΡΠ΅Π½ΠΈΡ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ, Π·Π°ΡΡΠ°ΡΠΈΠ²Π°Π΅ΠΌΠΎΠ³ΠΎ Π½Π° Π²Π΅ΡΡ ΡΠΈΠΊΠ» Π²Π²ΠΎΠ΄Π° Π² ΡΠΊΡΠΏΠ»ΡΠ°ΡΠ°ΡΠΈΡ ΠΈΠ·Π΄Π΅Π»ΠΈΡ, Π½Π°ΡΠΈΠ½Π°Ρ Ρ ΡΡΠ°ΠΏΠ° ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΈ Π·Π°ΠΊΠ°Π½ΡΠΈΠ²Π°Ρ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΠ΅ΠΌ Π³ΠΎΡΠΎΠ²ΠΎΠ³ΠΎ ΠΏΡΠΎΠ΄ΡΠΊΡΠ°, ΡΡΠ΅Π±ΡΠ΅ΡΡΡ ΡΠΎΡΡΠΈΡΠΎΠ²Π°ΡΡ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ ΠΎΠΏΡΡΠ½ΠΎ-ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΎΡΡΠΊΠΈΡ
ΡΠ°Π±ΠΎΡ. ΠΡΠΎ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎ ΠΎΡΡΡΠ΅ΡΡΠ²ΠΈΡΡ Π·Π° ΡΡΡΡ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅Π½Π½ΡΡ
ΠΌΠΎΡΠ½ΠΎΡΡΠ΅ΠΉ, Π° ΡΠ°ΠΊΠΆΠ΅ Π±Π»Π°Π³ΠΎΠ΄Π°ΡΡ ΡΠΎΠΊΡΠ°ΡΠ΅Π½ΠΈΡ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ ΡΠ°ΡΡΠ½ΡΡ
ΡΠΈΠΊΠ»ΠΎΠ² ΡΡΡΠ΅ΡΡΠ²ΠΎΠ²Π°Π½ΠΈΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ.ΠΠ΅ΡΠΌΠΎΡΡΡ Π½Π° ΡΠΎ, ΡΡΠΎ ΠΌΠΎΠ΄Π΅Π»Ρ ΡΡΠ°Π½ΠΎΠ²ΠΈΡΡΡ ΠΏΠ΅ΡΠ΅ΠΈΠ·Π±ΡΡΠΎΡΠ½ΠΎΠΉ, Π°Π²ΡΠΎΡΡ ΡΡΠΈΡΠ°ΡΡ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡΠΌ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ Π΄ΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² Π΄Π»Ρ ΡΡΡΡΠ° Π²ΡΠ΅Ρ
Π½ΡΠ°Π½ΡΠΎΠ², ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΡΡΡΠΈΡ
Π²ΡΠ±ΠΎΡΡ Π½Π°ΠΈΠ»ΡΡΡΠ΅Π³ΠΎ ΡΠ΅ΡΠ΅Π½ΠΈΡ Π² ΡΠ°ΡΡΠΈ ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ, ΡΡΠΎ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΠΈΡΡ ΠΏΠΎΠ»Π½ΡΡ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ°
Raman, infrared and optical spectra of the spin-Peierls compound NaV_2O_5
We have measured polarized spectra of Raman scattering, infrared and optical
transmission of NaV_2O_5 single crystals above the temperature of the
spin-Peierls transition Tsp=35 K. Some of the far-infrared (FIR) phonon lines
are strongly asymmetric, due to the spin-phonon interaction. In addition to the
phonon lines, a broad band was observed in the c(aa)c Raman spectrum and in the
E||a FIR transmission spectrum. A possible origin of these bands is discussed.
The absorption band at 10000 cm-1 1.25 eV is attributed to vanadium d-d
electronic transitions while the absorption edge above 3 eV is supposed to
correspond to the onset of charge-transfer transitions.Comment: 7 figures, 8 page
Folded modes in the infrared spectra of the spin-Peierls phase of CuGeO_3
Polarized far-infrared transmittance spectra of CuGeO_3 single crystals were
measured at different temperatures (6K < T < 300K). Two spectral lines, at
284.2 cm-1 in E||c polarization and at 311.7 cm-1 in E||b polarization, appear
at the temperature of the spin-Peierls transition and grow in intensity with
decreasing temperature. Both of them are, most probably, folded modes of the
dimerized lattice. We discuss a possible role of the spin-phonon interaction in
the formation of the 311.7 cm-1 feature.Comment: 4 pages, 5 figures, 1 table; Submitted to Phys.Rev.B Second revision.
Figures and text were slightly change
Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?
We report high resolution polarized infrared studies of the quarter-filled
spin ladder compound alpha'-NaV_2O_5 as a function of temperature (5K <= T <=
300K). Numerous new modes were detected below the temperature T_c=34K of the
phase transition into a charge ordered nonmagnetic state accompanied by a
lattice dimerization. We analyse the Brillouin zone (BZ) folding due to lattice
dimerization at T_c and show that some peculiarities of the low-temperature
vibrational spectrum come from quadruplets folded from the BZ point (1/2, 1/2,
1/4). We discuss an earlier interpretation of the 70, 107, and 133cm-1 modes as
magnetic bound states and propose the alternative interpretation as folded
phonon modes strongly interacting with charge and spin excitations.Comment: 15 pages, 13 Postscript figure
Antimicrobial propensity of ultrananocrystalline diamond films with embedded silver nanodroplets
- β¦