97 research outputs found
Study of distortion effects and clustering of isotopic impurities in solid molecular para-hydrogen by Shadow Wave Functions
We employed a fully optimized Shadow Wave Function (SWF) in combination with
Variational Monte Carlo techniques to investigate the properties of HD
molecules and molecular ortho-deuterium (o-D_2) in bulk solid para-hydrogen
(p-H_2). Calculations were performed for different concentrations of impurities
ranging from about 1% to 25% at the equilibrium density for the para-hydrogen
crystal. By computing the excess energy both for clustered and isolated
impurities we tried to determine a limit for the solubility of HD and o-D_2 in
p-H_2.Comment: 4 pages, 4 figure
Low-temperature thermal and elastoacoustic properties of butanol glasses: Study of position isomerism effects around the boson peak
We have concurrently measured the specific heat, the thermal conductivity, and the longitudinal and transverse sound velocities at low temperature of glasses from different isomers of butanol (n-butanol, sec-butanol and isobutanol), as well as the low-temperature specific heat for the crystals of n-butanol, isobutanol and tert-butanol. Whereas the elastic constants both for crystals and glasses are found to be almost independent of the position of the hydrogen bonds, the thermal properties at low temperatures of these glasses at a few kelvin (around the boson peak in the reduced specific heat or around the plateau in the thermal conductivity) are found to vary strongly. Our experiments clearly contradict other works or models claiming a Debye scaling of the boson peak, and hence of the excess low-temperature specific heat of glasses. Data analysis based upon the soft-potential model and its extensions allows us to estimate the Ioffe-Regel limit in these and other alcohol glasses, finding a correlation with the boson-peak position in agreement with that previously reported by other groupsWe acknowledge financial support by the Spanish Ministry of Science within program CONSOLIDER Nanociencia Molecular CSD2007-00010 and by the Comunidad de Madrid through the project NANOBIOMAGNET S2009/MAT-1726
Phonon scattering in ortho-para hydrogen solid solutions (role of configurational relaxation)
The experimental data on the thermal conductivity of ortho-parahydrogen
solutions are analyzed on the basis of a relaxation-time model taking account
of configurational relaxation of the ortho subsystem. The influence of
configurational relaxation on the thermal conductivity is analyzed using
resonance scattering of phonons by pair clusters of orthomolecules taking
account of their rotational spectrum.Comment: 7 pages, 4 figure
Low-temperature properties of monoalcohol glasses and crystals
We review and jointly discuss both earlier and recent experiments conducted by us on simple aliphatic glass-forming monoalcohols at low temperatures, including specific heat, thermal conductivity, Brillouin scattering and x-ray diffraction experiments. The family of simple monoalcohols constitutes an interesting model system to explore different relevant issues concerning molecular glass-forming liquids, low-temperature universal proper-ties of glasses, and even the glass transition phenomenon itself. More specifically, we discuss the role played by the molecular aspect ratio in vitrification/crystallization kinetics, the reported appearance of particular cases of polymorphism (in ethanol) and polyamorphism (in butanol), and especially the influence of position isomerism and the location of the hydrogen bond on the lattice dynamics and hence on the low-temperature universal prop-erties of glasses
Thermal properties of halogen-ethane glassy crystals: Effects of orientational disorder and the role of internal molecular degrees of freedom
The thermal conductivity, specific heat, and specific volume of the orientational glass former 1,1,2-trichloro-1,2,2-trifluoroethane (CCl2F-CClF2, F-113) have been measured under equilibrium pressure within the low-temperature range, showing thermodynamic anomalies at ca. 120, 72, and 20 K. The results are discussed together with those pertaining to the structurally related 1,1,2,2-tetrachloro-1,2-difluoroethane (CCl2F-CCl2F, F-112), which also shows anomalies at 130, 90, and 60 K. The rich phase behavior of these compounds can be accounted for by the interplay between several of their degrees of freedom. The arrest of the degrees of freedom corresponding to the internal molecular rotation, responsible for the existence of two energetically distinct isomers, and the overall molecular orientation, source of the characteristic orientational disorder of plastic phases, can explain the anomalies at higher and intermediate temperatures, respectively. The soft-potential model has been used as the framework to describe the thermal properties at low temperatures. We show that the low-temperature anomaly of the compounds corresponds to a secondary relaxation, which can be associated with the appearance of Umklapp processes, i.e., anharmonic phonon-phonon scattering, that dominate thermal transport in that temperature rangeThis work was financially supported in part by the Spanish Ministry of Science and Innovation (Grant Nos. FIS2014-54734-P, FIS2011-23488, and MAT2014-57866- REDT), by the Catalan Government (Grant No. 2014SGR- 0581) and by the Comunidad de Madrid through program NANOFRONTMAG-CM (No. S2013/MIT-2850), as well as by the joint NAS Ukraine and Russian Foundation for Basic Research project βMetastable states of simple condensed systemsβ (Agreement No. N 7/-2013
ΠΠΈΠΌΡΠΎΡΠ΅Ρ Π² ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΌ ΠΏΠ΅ΡΠΈΠΎΠ΄Π΅ Ρ ΠΎΠ½ΠΊΠΎΡ ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ Π±ΠΎΠ»ΡΠ½ΡΡ
Purpose:Β to evaluate the influence of postoperative lymphatic leakage volume and duration on homokinesis and incidence of postoperative complications in oncosurgury patients underwent different operative interventions.Material and methods.Β The results of treatment of 310 patients subjected to standard elective surgical intervention for a malignant pathology of different organs with regional lymph node dissection were evaluated. The selection criterion was prolonged (more than 7 days) and prominent (over 50 ml a day) lymphatic leakage during the postoperative period. The fluid discharged during the postoperative period was identified as a lymph by cytology. The diagnosis of a malignant pathology was verified in all patients after histological examination and patients were distributed according to established diagnosis.Results.Β The duration of lymphatic leakage including the outpatient treatment stage varied from 9 days to 1 year and 2 months depending on the type of surgery. The longest lymphatic leakage occurred in 2 patients after radical mastectomy. During the 1st week of observation in patients with daily lymph losses up to 100 ml, no changes in the blood composition were noted. Prolonged lymphatic leakage (1β2 weeks after operation) in a volume over 100 ml a day resulted in reduced protein content in blood plasma, severe lymphocytopenia, increased platelet count. During the postoperative period, complications were detected in 31 patients; at that, during the 1st week of observation, 27 patients experienced initial lymphatic leakage over 100 ml a day. Analysis of fatal outcomes (7 patients) showed that in all patients the lymphatic leakage exceeded 150 ml a day and lasted 1 to 2 weeks. The longest inpatient time was typical for patients after Wertheim's hysterectomy and cystectomy, whereas the longest outpatient treatment was experienced by patients after radical mastectomy and inguinofemoral lymph node dissection.Conclusion.Β In case of lymphatic leakage over 100 ml a day in oncosurgury patients, it was necessary to make up protein losses and after 7 days of persistent lymphatic leakage it became necessary to consider use of active surgical tactics aimed at liquidation of lymph losses.Π¦Π΅Π»Ρ:Β ΠΎΠΏΡΠ΅Π΄Π΅Π»ΠΈΡΡ Π²Π»ΠΈΡΠ½ΠΈΠ΅ ΠΎΠ±ΡΠ΅ΠΌΠ° ΠΈ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ Π»ΠΈΠΌΡΠΎΡΠ΅ΠΈ Π½Π° Π³ΠΎΠΌΠ΅ΠΎΠΊΠΈΠ½Π΅Π· ΠΈ ΡΠ°ΡΡΠΎΡΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ Ρ ΠΎΠ½ΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
Π±ΠΎΠ»ΡΠ½ΡΡ
ΠΏΡΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΠΌΠ΅ΡΠ°ΡΠ΅Π»ΡΡΡΠ²Π°Ρ
.ΠΠ°ΡΠ΅ΡΠΈΠ°Π» ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ.Β ΠΡΠ΅Π½ΠΈΠ»ΠΈ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π»Π΅ΡΠ΅Π½ΠΈΡ 310 ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ², ΠΊΠΎΡΠΎΡΡΠΌ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈ ΡΡΠ°Π½Π΄Π°ΡΡΠ½ΠΎΠ΅ ΠΏΠ»Π°Π½ΠΎΠ²ΠΎΠ΅ Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π²ΠΌΠ΅ΡΠ°ΡΠ΅Π»ΡΡΡΠ²ΠΎ ΠΏΠΎ ΠΏΠΎΠ²ΠΎΠ΄Ρ Π·Π»ΠΎΠΊΠ°ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΏΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΎΡΠ³Π°Π½ΠΎΠ² Ρ ΡΠ΅Π³ΠΈΠΎΠ½Π°ΡΠ½ΠΎΠΉ Π»ΠΈΠΌΡΠΎΠ΄ΠΈΡΡΠ΅ΠΊΡΠΈΠ΅ΠΉ. ΠΡΠΈΡΠ΅ΡΠΈΠ΅ΠΌ ΠΎΡΠ±ΠΎΡΠ° Π±ΡΠ»Π° Π΄Π»ΠΈΡΠ΅Π»ΡΠ½Π°Ρ (Π±ΠΎΠ»Π΅Π΅ 7 Π΄Π½Π΅ΠΉ) ΠΈ Π²ΡΡΠ°ΠΆΠ΅Π½Π½Π°Ρ (Π±ΠΎΠ»Π΅Π΅ 50 ΠΌΠ» Π² ΡΡΡΠΊΠΈ) Π»ΠΈΠΌΡΠΎΡΠ΅Ρ Π² ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΌ ΠΏΠ΅ΡΠΈΠΎΠ΄Π΅. ΠΡΠ΄Π΅Π»ΡΠ΅ΠΌΡΡ Π² ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΌ ΠΏΠ΅ΡΠΈΠΎΠ΄Π΅ ΠΆΠΈΠ΄ΠΊΠΎΡΡΡ ΠΈΠ΄Π΅Π½ΡΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π»ΠΈ ΠΊΠ°ΠΊ Π»ΠΈΠΌΡΡ ΡΠΈΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈ. ΠΠΈΠ°Π³Π½ΠΎΠ· Π·Π»ΠΎΠΊΠ°ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΏΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ Π²Π΅ΡΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π»ΠΈ Ρ Π²ΡΠ΅Ρ
ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΠΏΠΎΡΠ»Π΅ Π³ΠΈΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈ Π±ΠΎΠ»ΡΠ½ΡΡ
ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»ΠΈΠ»ΠΈ ΠΏΠΎ Π½ΠΎΠ·ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠΎΡΠΌΠ°ΠΌ.Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ.Β ΠΡΠΎΠ΄ΠΎΠ»ΠΆΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ Π»ΠΈΠΌΡΠΎΡΠ΅ΠΈ, Π²ΠΊΠ»ΡΡΠ°Ρ Π°ΠΌΠ±ΡΠ»Π°ΡΠΎΡΠ½ΡΠΉ ΡΡΠ°ΠΏ Π»Π΅ΡΠ΅Π½ΠΈΡ, Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ Π²ΠΈΠ΄Π° ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΡΠΎΡΡΠ°Π²ΠΈΠ»Π° ΠΎΡ 9 Π΄Π½Π΅ΠΉ Π΄ΠΎ 1 Π³ΠΎΠ΄Π° 2 ΠΌΠ΅ΡΡΡΠ΅Π². ΠΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎ ΠΏΡΠΎΠ΄ΠΎΠ»ΠΆΠΈΡΠ΅Π»ΡΠ½Π°Ρ Π»ΠΈΠΌΡΠΎΡΠ΅Ρ ΠΈΠΌΠ΅Π»Π°ΡΡ Ρ 2-Ρ
ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠΊ ΠΏΠΎΡΠ»Π΅ ΡΠ°Π΄ΠΈΠΊΠ°Π»ΡΠ½ΠΎΠΉ ΠΌΠ°ΡΡΡΠΊΡΠΎΠΌΠΈΠΈ. Π ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ 1-ΠΉ Π½Π΅Π΄Π΅Π»ΠΈ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ Π΅ΠΆΠ΅Π΄Π½Π΅Π²Π½ΡΠΌΠΈ Π»ΠΈΠΌΡΠΎΠΏΠΎΡΠ΅ΡΡΠΌΠΈ Π΄ΠΎ 100 ΠΌΠ» ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ Π² ΡΠΎΡΡΠ°Π²Π΅ ΠΊΡΠΎΠ²ΠΈ Π½Π΅ ΠΎΡΠΌΠ΅ΡΠΈΠ»ΠΈ. ΠΡΠΎΠ΄ΠΎΠ»ΠΆΠΈΡΠ΅Π»ΡΠ½Π°Ρ Π»ΠΈΠΌΡΠΎΡΠ΅Ρ (1β2 Π½Π΅Π΄Π΅Π»ΠΈ ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ) ΠΎΠ±ΡΠ΅ΠΌΠΎΠΌ Π±ΠΎΠ»Π΅Π΅ 100 ΠΌΠ» Π² ΡΡΡΠΊΠΈ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΠ»Π° ΠΊ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ Π±Π΅Π»ΠΊΠ° Π² ΠΏΠ»Π°Π·ΠΌΠ΅ ΠΊΡΠΎΠ²ΠΈ, Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΠΎΠΉ Π»ΠΈΠΌΡΠΎΡΠΈΡΠΎΠΏΠ΅Π½ΠΈΠΈ, ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΡ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° ΡΡΠΎΠΌΠ±ΠΎΡΠΈΡΠΎΠ². ΠΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΡ Π² ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΌ ΠΏΠ΅ΡΠΈΠΎΠ΄Π΅ Π²ΡΡΠ²ΠΈΠ»ΠΈ Ρ 31 ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ°, ΠΏΡΠΈ ΡΡΠΎΠΌ Ρ 27 Π±ΠΎΠ»ΡΠ½ΡΡ
Π² ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ 1-ΠΉ Π½Π΅Π΄Π΅Π»ΠΈ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡ ΠΈΡΡ
ΠΎΠ΄Π½Π°Ρ Π»ΠΈΠΌΡΠΎΡΠ΅Ρ Π±ΡΠ»Π° Π±ΠΎΠ»Π΅Π΅ 100 ΠΌΠ» Π² ΡΡΡΠΊΠΈ. ΠΠ½Π°Π»ΠΈΠ· ΡΠΌΠ΅ΡΡΠ΅Π»ΡΠ½ΡΡ
ΠΈΡΡ
ΠΎΠ΄ΠΎΠ² (7 ΡΠ΅Π»ΠΎΠ²Π΅ΠΊ) ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ Ρ Π²ΡΠ΅Ρ
ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Π»ΠΈΠΌΡΠΎΡΠ΅Ρ ΠΏΡΠ΅Π²ΡΡΠ°Π»Π° 150 ΠΌΠ» Π² ΡΡΡΠΊΠΈ, Π΄Π»ΠΈΠ»Π°ΡΡ ΠΎΡ 1 Π΄ΠΎ 2 Π½Π΅Π΄Π΅Π»Ρ. ΠΠ°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΠΏΡΠΎΠ΄ΠΎΠ»ΠΆΠΈΡΠ΅Π»ΡΠ½ΡΠΌ ΠΏΡΠ΅Π±ΡΠ²Π°Π½ΠΈΠ΅ΠΌ Π² ΡΡΠ°ΡΠΈΠΎΠ½Π°ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΠΎΠ²Π°Π»ΠΈΡΡ ΠΏΠ°ΡΠΈΠ΅Π½ΡΡ ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΠΠ΅ΡΡΠ³Π΅ΠΉΠΌΠ° ΠΈ ΡΠΈΡΡΡΠΊΡΠΎΠΌΠΈΠΈ, Π°ΠΌΠ±ΡΠ»Π°ΡΠΎΡΠ½ΠΎ Π΄ΠΎΠ»ΡΡΠ΅ Π²ΡΠ΅Π³ΠΎ Π»Π΅ΡΠΈΠ»ΠΈΡΡ ΠΏΠ°ΡΠΈΠ΅Π½ΡΡ ΠΏΠΎΡΠ»Π΅ ΡΠ°Π΄ΠΈΠΊΠ°Π»ΡΠ½ΡΡ
ΠΌΠ°ΡΡΡΠΊΡΠΎΠΌΠΈΠΉ ΠΈ ΠΏΠ°Ρ
ΠΎΠ²ΠΎ-Π±Π΅Π΄ΡΠ΅Π½Π½ΡΡ
Π»ΠΈΠΌΡΠΎΠ΄ΠΈΡΡΠ΅ΠΊΡΠΈΠΉ.ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅.Β ΠΡΠΈ Π»ΠΈΠΌΡΠΎΡΠ΅Π΅ Π±ΠΎΠ»Π΅Π΅ 100 ΠΌΠ» Π² ΡΡΡΠΊΠΈ Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΠΎΠ½ΠΊΠΎΡ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΡΠΈΠ»Ρ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎ Π²ΠΎΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠ΅ Π±Π΅Π»ΠΊΠΎΠ²ΡΡ
ΠΏΠΎΡΠ΅ΡΡ, Π° ΠΏΠΎΡΠ»Π΅ 7 ΡΡΡΠΎΠΊ, ΠΏΡΠΈ Π½Π΅ΠΊΡΠΏΠΈΡΡΠ΅ΠΌΠΎΠΉ Π»ΠΈΠΌΡΠΎΡΠ΅Π΅ Π² ΡΠ°ΠΊΠΈΡ
ΠΎΠ±ΡΠ΅ΠΌΠ°Ρ
, Π²ΠΎΠ·Π½ΠΈΠΊΠ°Π΅Ρ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡ Π² ΠΏΠΎΡΡΠ°Π½ΠΎΠ²ΠΊΠ΅ Π²ΠΎΠΏΡΠΎΡΠ° ΠΎ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠΈ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ°ΠΊΡΠΈΠΊΠΈ, Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΠΎΠΉ Π½Π° Π»ΠΈΠΊΠ²ΠΈΠ΄Π°ΡΠΈΡ Π»ΠΈΠΌΡΠΎΠΏΠΎΡΠ΅ΡΡ
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