scholarly journals Light Yield Response of Neutron Scintillation Screens to Sudden Flux Changes

2020 ◽  
Vol 6 (12) ◽  
pp. 134
Author(s):  
Tobias Neuwirth ◽  
Bernhard Walfort ◽  
Simon Sebold ◽  
Michael Schulz
Keyword(s):  
Neutron Flux ◽  
Light Yield ◽  
Neutron Imaging ◽  
Frame Rate ◽  
Yield Response ◽  
High Frame Rate ◽  
Long Term Stability ◽  
High Light Yield ◽  
Different Temperatures

We performed a study of the initial and long term light yield of different scintillation screen mixtures for neutron imaging during constant neutron irradiation. We evaluated the light yield during different neutron flux levels as well as at different temperatures. As high frame rate imaging is a topic of interest in the neutron imaging community, the decay characteristics of scintillation screens are of interest as well. Hence, we also present and discuss the decay behavior of the different scintillation screen mixtures on a time scale of seconds. We have found that the decay time of ZnS:Cu/6LiF excited with a high neutron flux is potentially much longer than typically stated. While most of the tested scintillation screens do not provide a significant improvement over currently used scintillation screen materials, Zn(Cd)S:Ag/6LiF seems to be a good candidate for high frame rate imaging due to its high light yield, long-term stability as well as fast decay compared to the other evaluated scintillation screens.

Evaluation of long-term frozen storage of plasma for measurement of high-density lipoprotein and its subfractions by precipitation

1990 ◽  
Vol 36 (5) ◽  
pp. 783-788 ◽  
Author(s):  
M N Nanjee ◽  
N E Miller
Keyword(s):  
High Density Lipoprotein ◽  
Liquid Nitrogen ◽  
Frozen Storage ◽  
Density Lipoprotein ◽  
High Density ◽  
Long Term Stability ◽  
Long Term Storage ◽  
Different Temperatures ◽  
Edta Plasma

Abstract The concentration of high-density lipoprotein cholesterol (HDL-C) in plasma is now established as an independent risk factor for coronary heart disease, but more data are needed on the relative risk-predictive powers of different HDL subclasses. For epidemiologic and clinical purposes, isolation of HDL from other lipoproteins and separation of its two major subclasses, HDL2 and HDL3, are performed most conveniently by precipitation. Although storage of plasma is commonly necessary, little information is available on the long-term stability of HDL subclasses at different temperatures. Therefore, we quantified HDL-C, HDL2-C, and HDL3-C by dual precipitation with heparin-MnCl2/15-kDa dextran sulfate (H-M/DS) in samples of EDTA-plasma from 93 healthy subjects, after storage for one to 433 days at -20 degrees C, at -70 degrees C, or in liquid nitrogen (-196 degrees C). Fourteen samples (15%) were stored for a year or longer. At -20 degrees C, HDL-C decreased by 4.8% per year and HDL3-C decreased by 6.9% per year (P = 0.002 for both variables) relative to results obtained with samples stored in liquid nitrogen; total cholesterol, HDL2-C, and triglyceride did not change significantly at this temperature. When stored at -70 degrees C, none of the lipids showed any change relative to results obtained with liquid nitrogen. Thus, long-term storage of EDTA-plasma at -20 degrees C is unsuitable for subsequent quantification of HDL-C and its subclasses by H-M/DS dual precipitation. Storage at -70 degrees C is preferable, and is as reliable as storage in liquid nitrogen.

scholarly journals Cинтез и испытания 1 m-=SUP=-3-=/SUP=- жидкого сцинтиллятора на основе линейного алкилбензола

2019 ◽  
Vol 45 (1) ◽  
pp. 54
Author(s):  
Д.С. Кузнецов ◽  
Е.А. Литвинович ◽  
А.Е. Мурченко ◽  
Б.А. Обиняков ◽  
А.Ю. Оралбаев ◽  
...  
Keyword(s):  
Light Yield ◽  
Observation Time ◽  
Kurchatov Institute ◽  
Linear Alkylbenzene ◽  
Organic Scintillator ◽  
Long Term Stability ◽  
Antineutrino Detector ◽  
Liquid Organic Scintillator ◽  
Systemic Degradation

AbstractThe stability of a liquid organic scintillator based on linear alkylbenzene in a volume of 1 m^3 was measured. The measurements were performed using an iDREAM reactor antineutrino detector at the National Research Center Kurchatov Institute. No systemic degradation of the scintillator light yield within an observation time of 225 days was observed. These long-term stability measurements of a large-volume liquid organic scintillator based on linear alkylbenzene are the first in Russia.

HOT WATER-REPELLENT SUPERHYDROPHOBIC SURFACES WITH LONG-TERM STABILITY

2021 ◽  
Author(s):  
JI SEONG CHOI ◽  
SEONG MIN KANG
Keyword(s):  
Hot Water ◽  
Superhydrophobic Surfaces ◽  
Water Repellent ◽  
Water Droplets ◽  
Long Term Stability ◽  
Cassie State ◽  
Potential Applications ◽  
Different Temperatures ◽  
Temperature Water

In this paper, we fabricate and evaluate superhydrophobic surfaces with mushroom-shaped microstructures. Using a silicon master and polymer microstructure patterning, polydimethylsiloxane (PDMS) surfaces bearing mushroom-shaped structures with five different spacing ratios are prepared and tested with water droplets of different temperatures. The fabricated PDMS surfaces demonstrate superhydrophobicity even to high-temperature water droplets with decreased surface tension. We compare the experimental data with the theoretical results calculated based on the Cassie state and Eötvös rule. Our work suggests potential applications to control wettability with liquids of various temperatures.

Long-term stability of ganciclovir in polypropylene containers at room temperature

2017 ◽  
Vol 25 (2) ◽  
pp. 303-308 ◽  
Author(s):  
Nicolas Guichard ◽  
Pascal Bonnabry ◽  
Serge Rudaz ◽  
Sandrine Fleury-Souverain
Keyword(s):  
High Performance ◽  
Physical Stability ◽  
Significant Loss ◽  
Stability Indicating ◽  
Long Term Stability ◽  
Stability Indicating Method ◽  
All Solutions ◽  
Different Temperatures ◽  
The Stability

Purpose Ganciclovir is increasingly provided by hospital pharmacy production unit in a ready-to-use form, in order to improve the safety of healthcare workers and the efficiency of the organisation. The objective of this study was to develop a stability-indicating method to assay ganciclovir and determine the stability of ganciclovir in syringes (5 mg/mL) and infusion bags (0.25 and 5 mg/mL) at two different temperatures. Method Ganciclovir solutions (0.25 mg/mL and 5 mg/mL) in 0.9% sodium chloride were prepared in 50 mL polypropylene syringes or 100 mL polypropylene infusion bags and stored at 2–8℃ and 23–27℃. The chemical stability was measured using a stability-indicating Ultra High Performance Liquid Chromatography coupled to mass spectrometry method. Physical stability was assessed by visual inspection. Results No significant loss of ganciclovir under any of the tested conditions was observed in this study. All solutions remained clear through the study period. Conclusion All tested formulations remained stable for at least 185 days independently of container type, temperature or concentration studied.

Stability and Change in Emotional Intelligence: Exploring the Transition to Young Adulthood

2005 ◽  
Vol 26 (2) ◽  
pp. 100-106 ◽  
Author(s):  
James D.A. Parker ◽  
Donald H. Saklofske ◽  
Laura M. Wood ◽  
Jennifer M. Eastabrook ◽  
Robyn N. Taylor
Keyword(s):  
High School ◽  
Emotional Intelligence ◽  
Postsecondary Education ◽  
Life Transition ◽  
Full Time ◽  
Major Life ◽  
Long Term Stability ◽  
Time Period ◽  
Transition From High School

Abstract. The concept of emotional intelligence (EI) has attracted growing interest from researchers working in various fields. The present study examined the long-term stability (32 months) of EI-related abilities over the course of a major life transition (the transition from high school to university). During the first week of full-time study, a large group of undergraduates completed the EQ-i:Short; 32 months later a random subset of these students (N = 238), who had started their postsecondary education within 24 months of graduating from high school, completed the measures for a second time. The study found EI scores to be relatively stable over the 32-month time period. EI scores were also found to be significantly higher at Time 2; the overall pattern of change in EI-levels was more than can be attributed to the increased age of the participants.

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