Luminescence and decay properties of the 1D2 level of Pr3+-doped YPO4

2011 ◽  
Vol 89 (3) ◽  
pp. 415-422 ◽  
Author(s):  
J. Collins ◽  
M. Bettinelli ◽  
B. Di Bartolo
Keyword(s):  
Low Temperature ◽  
Temperature Dependence ◽  
Radiative Decay ◽  
Spectroscopic Properties ◽  
Decay Rates ◽  
Decay Kinetics ◽  
Population Redistribution ◽  
Individual Crystal ◽  
Decay Properties ◽  
Kinetics Of

This investigation reports on the spectroscopic properties of trivalent Pr in YPO4. In particular, we show how the luminescence from the 1D2 level depends on the polarization of the emission and on the temperature of the sample. We also report on the decay kinetics of the 1D2 level, which show the lifetime decreasing as temperature is increased. Our observed lifetime of 440 µs is at low temperature and is significantly longer than that reported by other workers. We explain the temperature dependence of the 1D2 emission by considering the population redistribution in the 1D2 level, without invoking the existence of multiphonon relaxation. Finally, we estimate the radiative decay rates of individual crystal field levels within the 1D2 manifold.

Kinetics of autothermal thermophilic aerobic digestion – application and extension of Activated Sludge Model No 1 at thermophilic temperatures

2007 ◽  
Vol 56 (9) ◽  
pp. 137-145 ◽  
Author(s):  
R. Kovács ◽  
P. Miháltz ◽  
Zs. Csikor
Keyword(s):  
Mathematical Model ◽  
Activated Sludge ◽  
Temperature Dependence ◽  
Decay Rates ◽  
Experimental Results ◽  
Aerobic Digestion ◽  
Activated Sludge Model ◽  
Thermophilic Aerobic Digestion ◽  
Autothermal Thermophilic Aerobic Digestion ◽  
Kinetics Of

The application of an ASM1-based mathematical model for the modeling of autothermal thermophilic aerobic digestion is demonstrated. Based on former experimental results the original ASM1 was extended by the activation of facultative thermophiles from the feed sludge and a new component, the thermophilic biomass was introduced. The resulting model was calibrated in the temperature range of 20–60 °C. The temperature dependence of the growth and decay rates in the model is given in terms of the slightly modified Arrhenius and Topiwala-Sinclair equations. The capabilities of the calibrated model in realistic ATAD scenarios are demonstrated with a focus on autothermal properties of ATAD systems at different conditions.

Radiative and non-radiative decay kinetics of (CdSe)N (N = 3 and 4) clusters

2019 ◽  
Vol 151 (6) ◽  
pp. 064306 ◽  
Author(s):  
Yujuan Xie ◽  
Shengping Yu ◽  
Li Zhang ◽  
Ning Du ◽  
Mingli Yang
Keyword(s):  
Radiative Decay ◽  
Decay Kinetics ◽  
Kinetics Of

scholarly journals Metagenome-based comparisons of decay rates and host-specificity of fecal microbial communities for improved microbial source tracking

2021 ◽  
Author(s):  
Brittany Suttner ◽  
Blake G. Lindner ◽  
Minjae Kim ◽  
Roth Edward Conrad ◽  
Luis M Rodriguez ◽  
...  
Keyword(s):  
Host Specificity ◽  
Primary Source ◽  
Microbial Source Tracking ◽  
Decay Rates ◽  
Source Tracking ◽  
Waterborne Diseases ◽  
Decay Kinetics ◽  
Dialysis Bag ◽  
Kinetics Of ◽  
Respective Host

Fecal material in the environment is a primary source of pathogens that cause waterborne diseases and affect over a billion people worldwide. Microbial source tracking (MST) assays based on single genes (e.g., 16S rRNA) do not always provide the resolution needed to attribute fecal contamination sources. In this work, we used dialysis bag mesocosms simulating a freshwater habitat that were spiked separately with cow, pig, or human feces to monitor the decay of host-specific fecal signals over time with metagenomics, traditional qPCR, and culture-based methods. Sequencing of the host fecal communities used as inocula recovered 79 non-redundant metagenome-assembled genomes (MAGs) whose abundance patterns showed that the majority of the fecal community signal was not detectable in the mesocosm metagenomes after four days. Several MAGs showed high host specificity, and thus are promising candidates for biomarkers for their respective host type. Traditional qPCR methods varied in their correlation with MAG decay kinetics. Notably, the human-specific Bacteroides assay, HF183/BFDRev, consistently under-estimated fecal pollution due to not being present in all hosts and/or primer mismatches. This work provides new insights on the persistence and decay kinetics of host-specific gut microbes in the environment and identifies several MAGs as putative biomarkers for improved MST.

scholarly journals Rethinking growth and decay kinetics in activated sludge – towards a new adaptive kinetics approach

2016 ◽  
Vol 75 (3) ◽  
pp. 501-506 ◽  
Author(s):  
Michael Friedrich ◽  
Jose Jimenez ◽  
Amy Pruden ◽  
Jennifer H. Miller ◽  
Jacob Metch ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Decay Rates ◽  
Molecular Techniques ◽  
Physiological Adaptation ◽  
Ammonia Oxidizing Bacteria ◽  
Decay Kinetics ◽  
Active Biomass ◽  
Decay Properties ◽  
Nitrite Oxidizing Bacteria ◽  
Solids Retention

Growth kinetics in activated sludge modelling (ASM) are typically assumed to be the result of intrinsic growth and decay properties and thus process parameters are deemed to be constant. The activity change in a microbial population is expressed in terms of variance of the active biomass fraction and not actual shifts in bacterial cellular activities. This approach is limited, in that it does not recognise the reality that active biomass is highly physiologically adaptive. Here, a strong correlation between maximum specific growth rate (μmax) and decay rate (be) of ordinary heterotrophic organisms was revealed in both low solids retention times (SRT) and high SRT activated sludge systems. This relationship is indicative of physiological adaptation either for growth (high μmax and be) or survival optimization (low μmax and be). Further, the nitrifier decay process was investigated using molecular techniques to measure decay rates of ammonia oxidizing bacteria and nitrite oxidizing bacteria over a range of temperatures. This approach revealed decay rates 10–12% lower than values previously accepted and used in ASM. These findings highlight potential benefits of incorporating physiological adaptation of heterotrophic and nitrifying populations in future ASM.

Decay Kinetics of N(2P or2D) + N2(X1Σg+,v‘ ‘) in Low Temperature Solid Nitrogen†

2000 ◽  
Vol 104 (16) ◽  
pp. 3693-3697 ◽  
Author(s):  
Kenji Takizawa ◽  
Akinori Takami ◽  
Seiichiro Koda
Keyword(s):  
Low Temperature ◽  
Decay Kinetics ◽  
Solid Nitrogen ◽  
Kinetics Of

scholarly journals Electric field dependent radiative decay kinetics of polar InGaN/GaN quantum heterostructures at low fields

2009 ◽  
Vol 94 (21) ◽  
pp. 211107 ◽  
Author(s):  
Emre Sari ◽  
Sedat Nizamoglu ◽  
In-Hwan Lee ◽  
Jong-Hyeob Baek ◽  
Hilmi Volkan Demir
Keyword(s):  
Electric Field ◽  
Radiative Decay ◽  
Decay Kinetics ◽  
Field Dependent ◽  
Kinetics Of ◽  
Quantum Heterostructures

Unusual Temperature Dependence of the Fluorescence Decay in Heterostructured Stilbene

2021 ◽  
Author(s):  
Renata Karpicz ◽  
Nina Ostapenko ◽  
Yura Ostapenko ◽  
Yaroslava Polupan ◽  
Igor Lazarev ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Wide Temperature Range ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Fluorescence Decay ◽  
Decay Kinetics ◽  
Temperature Range ◽  
Fluorescence Decay Kinetics ◽  
Kinetics Of

Fluorescence spectra as well as fluorescence decay kinetics of hot-pressed and sublimated films of stilbene has been studied in wide temperature range, from 15 K up to room temperature. Fluorescence...

The low temperature aluminising kinetics of hot-work tool steels

2012 ◽  
Vol 67 (2) ◽  
pp. 133-139
Author(s):  
B. Matijević ◽  
I. Kumić ◽  
T. Belić
Keyword(s):  
Low Temperature ◽  
Tool Steels ◽  
Kinetics Of ◽  
Hot Work Tool Steels
Sign in / Sign up

Export Citation Format

Share Document