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51.
M. Krištofič A. Marcinčin A. Ujhelyiová 《Journal of Thermal Analysis and Calorimetry》2000,60(2):357-369
The DSC method was used to obtain more information on changes of thermal properties connected with different comonomers bound
in the (co)polymer chains. The copolyamides propered were block ones which were less crystalline and compatible with poly-ε-caprolactam.
The results have confirmed the crystalline nature of polyamides and copolyamides.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
52.
G. Kernel D. Korbar P. Križan M. Mikuž U. Seljak F. Sever A. Stanovnik M. Starič D. Zavrtanik C. W. E. van Eijk R. W. Hollander W. Lourens F. G. Michaelis N. W. Tanner S. A. Clark J. V. Jovanovich J. D. Davies J. Lowe S. M. Playfer OMICRON Collaboration 《Zeitschrift fur Physik C Particles and Fields》1990,48(2):201-207
The reaction π+ p→π+π+ n was studied in the vicinity of the reaction threshold at ten incident pion beam momenta from 297 MeV/c to 480 MeV/c. From data angular distributions, invariant mass spectra and integrated cross-sections were deduced. The chiral symmetry breaking parameter as determined by this reaction equals to ξ=1.56±0.26±0.39, where the first error is experimental, while the latter reflects the uncertainty in the ansatz used in the extrapolation to the reaction threshold. A comparison with the other reaction channels of the reaction πp→ππN indicates that a single parameter (ξ) is not sufficient to describe low energy ππ interactions. 相似文献
53.
Pavla Križman Lavrič Brigita Tomšič Barbara Simončič Marijn M. C. G. Warmoeskerken Dragan Jocic 《Cellulose (London, England)》2012,19(1):273-287
An innovative strategy for functional finishing of cotton involves application of stimuli-responsive surface modifying system
based on temperature- and pH-responsive poly-NiPAAm/chitosan microgel. The stimuli-responsiveness implied to cotton is the
consequence of swelling/collapse of the microgel particles incorporated to the fibre surface, which produces an active liquid
management system. The performance of functionalized cotton fabric in terms of liquid management properties was assessed by
choosing appropriate techniques (water uptake; thin-layer wicking; water retention capacity; and drying capability) and discussion
of the results was based on the types of water that are expected to be present in hydrated cotton and stimuli-responsive microgel. 相似文献
54.
H. Švajdlenková M. Iskrová O. Šauša G. Dlubek J. Krištiak J. Bartoš 《Macromolecular Symposia》2011,305(1):108-115
We report the results of a combined study of the local structure and the reorientation dynamics in a series of five amorphous polymers of different fragility: cis-trans-1,4-poly(butadiene) (c-t-1,4-PBD), cis-1,4-poly(isoprene) (cis-1,4-PIP), poly(isobutylene) (PIB), poly(vinyl methylether)(PVME) and poly (propylene glycol) (PPG) by using two different probe methods. The reorientation dynamics of the molecular spin probe 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) from electron spin resonance (ESR) is related to the annihilation behaviour of the atomic ortho-positronium (o-Ps) one as obtained by positron annihilation lifetime spectroscopy (PALS). It was found that a slow to fast transition in the spin probe rotation mobility at the operationally defined spectral temperature parameter, T50G, is connected with the mean o-Ps lifetime, τ3 (T50G) = (2.04 ± 0.26) ns. Consequently, using the free-volume concept of the o-Ps annihilation in terms of a quantum-mechanical model of o-Ps lifetime this transition can be connected with the occurrence of the mean free volume hole, Vh (T50G) = (102 ± 17) Å3, nearly independent of the chemical composition and the basic structural relaxation parameters of the amorphous polymers investigated. Finally, the free volume hole distribution aspect of the slow to fast transition indicates the presence of a sufficient free volume fluctuation at T50G for both typical fragile PVME and strong PIB polymer and emphasizes the essential role of free volume in the spin probe dynamics. 相似文献
55.
Kralj B Krizaj I Bukovec P Slejko S Milacic R 《Analytical and bioanalytical chemistry》2005,383(3):467-475
Speciation of Al in tea infusions was studied by size exclusion chromatography (SEC) and anion-exchange fast protein liquid
chromatography (FPLC). Fractions were collected throughout the chromatographic separations and Al was determined “off line”
by inductively coupled plasma optical emission spectroscopy (ICP–OES). Black, green, and red tea samples were investigated.
The total concentration of Al in tea infusions was determined by ICP–OES and ranged between 0.5 and 4 mg dm−3. The pH of tea infusions ranged between 5.3 and 5.5. Data from SEC–ICP–OES analysis indicated that 10–35% of total Al in
tea infusions was eluted at a retention volume corresponding to a molecular mass of approximately 3800 Da. The remaining Al
was adsorbed on the column resin. The same tea infusions were also analysed by anion-exchange FPLC–ICP–OES. It was found experimentally
that the same percentage of total Al as from the SEC column was eluted at a retention volume that corresponded to negatively
charged Al-citrate. The remaining Al was adsorbed on the column resin. Identification of Al-binding ligands eluting under
the chromatographic peak was performed by electrospray ionisation tandem mass spectrometry (ES–MS–MS) analysis. It was proven
that ionic Al species in tea infusions (10–35% of the total Al) corresponded to negatively charged Al-citrate. The remaining
species that was adsorbed on the SEC or FPLC columns was most probably bound to phenolic compounds. Speciation of Al in tea
with milk or lemon was also studied. Results for tea with milk indicated that Al-citrate was not transformed and that approximately
60% of total Al was transformed into high-molecular-mass Al species. This fraction was subjected to sodium dodecyl sulfonate
polyacryl gel electrophoresis (SDS–PAGE). The results indicated that Al was occluded by milk proteins (mostly caseins). When
citric acid was added to tea infusions the percentage of negatively charged Al-citrate remained either the same or increased
to 40% of total Al. 相似文献
56.
G. Kernel D. Korbar P. Križan M. Mikuž F. Sever A. Stanovnik M. Starič D. Zavrtanik E. G. Michaelis N. W. Tanner C. W. E. van Eijk R. W. Hollander W. Lourens S. A. Clark J. D. Davies J. Lowe S. M. Playfer J. V. Jovanovich 《Zeitschrift fur Physik C Particles and Fields》1991,51(3):377-386
We report on results of an experiment to study the reaction –
p – + in the incident pion momentum region between 295 and 450 MeV/c. A departure from phase space was observed in invariant-mass spectra and angular distributions which cannot be explained with and resonance production. It indicates aI=0,J
P
= 0+ – + final-state interaction.Deceased 相似文献
57.
58.
It is shown that the Nakanishi-Jean formulae for o-Ps lifetime vs. radius of spherical cavity gives the empirical relationship of Tao which links the o-Ps annihilation rate with macroscopic surface tension. 相似文献
59.
Krištof Romana Logar Jasmina Kožar 《Journal of Radioanalytical and Nuclear Chemistry》2017,314(2):715-719
The aim of the research was to test the generalized direct liquid scintillation spectrometry (LSC) method for bio-origin determination by measurement of C-14. Examples of diversified items with known and unknown bio-origin were measured by liquid scintillation counting and analyzed by procedures, developed for fuel samples. Bio-origin of fuels, lubricants and monomer resins were successfully determined via direct LSC method after simple sample preparation with acceptable accuracy and trueness despite their diversity in color, viscosity, density or chemical composition.
相似文献60.