Search results for "RPT"
showing 10 items of 5119 documents
Voltammetric Detection of Lead(II) Using Amide-Cyclam- Functionalized Silica-Modified Carbon Paste Electrodes
2009
2-(4,8,11-Triscarbamoylmethyl-1,4,8,11-tetraazacyclotetradec-1-yl)acetamide (TETAM) derivatives bearing 1, 2, or 4 silylated arms have been synthesized and grafted to the surface of silica gel and ordered mesoporous silica samples. The resulting organic-inorganic hybrids have been incorporated into carbon paste electrodes and applied to the preconcentration electroanalysis of Pb(II). The attractive recognition properties of these cyclam derivatives functionalized with amide pendent groups toward Pb(II) species and the highly porous structure of the adsorbents can be exploited for the selective and sensitive detection of the target analyte. Various parameters affecting the preconcentration a…
Sorption of Acid Green 16 from Aqueous Solution onto Low-moor Peat and Smectite Clay Co-occurring in Lignite of Belchatow Mine Field
2015
Celem badań było wyznaczenie pojemności sorpcyjnej iłu smektytowego i torfu niskiego towarzyszących pokładom złóż węgli brunatnych w stosunku do barwnika Acid Green 16 (AG–16) oraz określenie mechanizmu jego wiązania. Wyniki wskazały, że badany torf niski był skutecznym sorbentem barwnika AG-16 w całym zakresie stężeń początkowych (1–1000 mg/dm3), natomiast ił smektytowy – jedynie z zakresie stężeń wysokich (> 250 mg/dm3). W wyniku aktywacji termicznej iłu nastąpił wzrost jego pojemności sorpcyjnej w stosunku do badanego barwnika. Proces sorpcji barwnika przebiegał przy ujemnie naładowanej powierzchni sorbentów i wskazywał, że jednym z mechanizmów wiązania barwnika AG–16 były oddziaływania …
Experimental study of 100Tc β decay with total absorption γ -ray spectroscopy
2017
The β decay of 100Tc has been studied by using the total absorption γ -ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ -ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also r…
r Process (n, γ) Rate Constraints from the γ Emission of Neutron Unbound States in β decay
2017
Total absorption gamma-ray spectroscopy is used to measure accurately the intensity of γγ emission from neutron-unbound states populated in the ββ-decay of delayed-neutron emitters. From the comparison of this intensity with the intensity of neutron emission a constraint on the (n, γγ) cross section for highly unstable neutron-rich nuclei can be deduced. A surprisingly large γγ branching was observed for a number of isotopes which might indicate the need to increase by a large factor the Hauser-Feshbach (n, γγ) cross-section estimates that impact on r process abundance calculations. peerReviewed
Total absorption spectroscopy study of the β decay of 86Br and 91Rb
2017
The beta decays of 86Br and 91Rb have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the Ion Guide Isotope Separator On-Line facility in Jyväskylä and further purified using the JYFLTRAP. 86Br and 91Rb are considered to be major contributors to the decay heat in reactors. In addition, 91Rb was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decay was well known from high-resolution measurements. Our results show that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renor…
Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 87Br, 88Br, and 94Rb
2017
We investigate the decay of 87,88Br and 94Rb using total absorption γ -ray spectroscopy. These important fission products are β-delayed neutron emitters. Our data show considerable βγ intensity, so far unobserved in high-resolution γ -ray spectroscopy, from states at high excitation energy. We also find significant differences with the β intensity that can be deduced from existing measurements of the β spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the r…
The Ti-influence on the tourmaline color
2008
Titanium was examined in different black tourmalines by spectrophotometric analyses in the region between 12500 and 27000 cm-1 (800-370 nm) using a microscope spectrophotometer MPV-5P, Leitz (Germany), and chemically analyzed on an electron microprobe Camebax Microbeam, Cameca (France) in WDS Mode. Fourteen tourmaline samples with their face oriented parallel to the principal axis, cut and polished down to thin sections, showed polarized spectra of two broad absorption bands at approximately 14000 cm-1 (715 nm) and 24000 cm-1 (417 nm). Precision thickness measurements were used to calculate the absorption coefficients α. For the absorption around 24000 cm-1, a linear correlation was observe…
Tūrisma biznesa analīze Eiropā
2015
Šī diplomdarba tēmas aktualitāti nosaka tas, ka Eiropa ir viens no būtiskākajiem pasaules finanšu, tirdzniecības un tūrisma centriem. Mūsdienās Eiropa ietver sevī vairāk nekā 50 valstis. Kā arī starptautiskais tūrisms spēlē nozīmīgu lomu iekšzemes kopprodukta veidošanā, ārējās tirdzniecības bilances aktivizēšanā, papildus darbavietu radīšanā un iedzīvotāju nodarbinātības nodrošināšana katrā valstī. Diplomdarba mērķis ir starptautiskā tūrisma attīstības perspektīvu un tendenču analīze Eiropā un Eiropas loma starptautiskajā tūrisma pakalpojumu tirgū. Diplomdarbs sastāv no teorētiskās literatūras apkopojuma par starptautiskā tūrisma teorētiskiem aspektiem, no analītiskās daļas, kurā ir aplūkot…
Comparison of impact characteristics of different ice hockey arena dasher boards
2012
During last years the incidence and severity of ice hockey related concussions have been increased and, hence, something should be done to stop this growth. The main aim of this study was to find out how dasher board materials and structures affect impact characteristics and, thereby, the risk of concussions. The measurements were divided into two parts; in the first part, the physiological characteristics of body checks were determined in real game measurements, and the second part, consisted of simulation of body checks in the laboratory. High speed cameras and accelerometers were used to collect data. More flexible protective shielding material (dasher board B) resulted in lower peak for…
Jaunākās tendences genocīda mens rea konstatēšanā
2017
Genocīda nozieguma mens rea jeb subjektīvā puse ir sarežģīts starptautisko krimināltiesību jautājums, ar kura risināšanu un interpretāciju 21. gadsimtā īpaši aktīvi nodarbojas starptautiskās tiesas un tiesībzinātnieki. Tradicionālā genocīda mens rea pieeja paredz, ka genocīda noziegumā jākonstatē specifisks personas nodoms, kas vērsts tieši pret aizsargātās grupas iznīcināšanu. Apkopojot un analizējot jaunākās atziņas genocīda tiesībās, bakalaura darbā secināts, ka genocīda tiesību pētnieki rosina paplašināt mens rea izpratni, pieļaujot genocīda noziegumā konstatēt arī citas vainas formas.