High-sensitivity time-resolved reflectivity in extreme ultraviolet region for probing carrier and phonon dynamics

2020 ◽  
Author(s):  
Keiko Kato ◽  
Hiroki Mashiko ◽  
Yoji Kunihashi ◽  
Hiroo Omi ◽  
Hideki Gotoh ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
High Sensitivity ◽  
Ultraviolet Region ◽  
Time Resolved ◽  
Phonon Dynamics

Time-resolved ARPES Based on 8-fs High-harmonic Source in the Extreme Ultraviolet Region

2018 ◽  
Author(s):  
Kento Toume ◽  
Katsuya Oguri ◽  
Hiroki Mashiko ◽  
Keiko Kato ◽  
Yoshiaki Sekine ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Ultraviolet Region ◽  
Time Resolved ◽  
Harmonic Source

scholarly journals Highly sensitive transient reflection measurement in extreme ultraviolet region for tracking carrier and coherent phonon dynamics

2020 ◽  
Vol 28 (2) ◽  
pp. 1595
Author(s):  
Keiko Kato ◽  
Hiroki Mashiko ◽  
Yoji Kunihashi ◽  
Hiroo Omi ◽  
Hideki Gotoh ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Ultraviolet Region ◽  
Coherent Phonon ◽  
Reflection Measurement ◽  
Highly Sensitive ◽  
Phonon Dynamics

scholarly journals Effects of Crystal Morphology on the Hot-Carrier Dynamics in Mixed-Cation Hybrid Lead Halide Perovskites

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 708
Author(s):  
Daniele Catone ◽  
Giuseppe Ammirati ◽  
Patrick O’Keeffe ◽  
Faustino Martelli ◽  
Lorenzo Di Mario ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Carrier Dynamics ◽  
Large Area ◽  
Photovoltaic Properties ◽  
Time Resolved ◽  
Hot Carrier ◽  
Mixed Cation ◽  
Small Crystals ◽  
Characterization Of Materials ◽  
Lead Halide

Ultrafast pump-probe spectroscopies have proved to be an important tool for the investigation of charge carriers dynamics in perovskite materials providing crucial information on the dynamics of the excited carriers, and fundamental in the development of new devices with tailored photovoltaic properties. Fast transient absorbance spectroscopy on mixed-cation hybrid lead halide perovskite samples was used to investigate how the dimensions and the morphology of the perovskite crystals embedded in the capping (large crystals) and mesoporous (small crystals) layers affect the hot-carrier dynamics in the first hundreds of femtoseconds as a function of the excitation energy. The comparative study between samples with perovskite deposited on substrates with and without the mesoporous layer has shown how the small crystals preserve the temperature of the carriers for a longer period after the excitation than the large crystals. This study showed how the high sensitivity of the time-resolved spectroscopies in discriminating the transient response due to the different morphology of the crystals embedded in the layers of the same sample can be applied in the general characterization of materials to be used in solar cell devices and large area modules, providing further and valuable information for the optimization and enhancement of stability and efficiency in the power conversion of new perovskite-based devices.

Urinary gonadotropin measurements by enhanced luminometric assays (LIA) for the evaluation of pubertal development

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
And Demir ◽  
Adem Aydın ◽  
Atilla Büyükgebiz ◽  
Ulf-Håkan Stenman ◽  
Matti Hero
Keyword(s):  
Healthy Subjects ◽  
Reliable Method ◽  
Pubertal Development ◽  
High Sensitivity ◽  
Tanner Stage ◽  
Time Resolved ◽  
Stage 1 ◽  
Sensitive Detection Technique ◽  
Serum And Urine

Abstract Objectives Determination of LH in urine has proved to be a reliable method for evaluation of pubertal development. The human LH assay based on time-resolved immunofluorometric (IFMA) technology (AutoDELFIA, PerkinElmer, Wallac) has been found to be suitable for this purpose thanks to its high sensitivity but other assays have not been evaluated. We have analyzed our data obtained by another potentially sensitive detection technique, enhanced luminometric assay (LIA) with the objective of finding a viable alternative to IFMA since these may not be available in the future. Methods LIA was used to measure LH and FSH in serum and urine samples from 100 healthy subjects of each Tanner stage and both genders, whose pubertal development has been determined. Results Urinary gonodotropin concentrations measured by LIA correlated well with Tanner stage [(r=0.93 for girls, r=0.81 for boys; p<0.01 for LH) and (r=0.81 for girls, r=0.73 for boys; p<0.01 for FSH)]. LIA determinations revealed the increase in U-LH concentrations during the transition from Tanner stage 1–2 in both girls and boys (p<0.001), whereas U-FSH and S-LH were able to detect the increase from Tanner stage 1–2 only in boys or girls, respectively (both p<0.001). Conclusions Measurement of urinary gonadotropin concentrations by LIA may be useful for the evaluation of overall pubertal development and also in the detection of transition from prepuberty to puberty.

Effect of energetic electron and proton bombardment on the reflectance of silicon-carbide mirrors in the extreme-ultraviolet region

1994 ◽  
Vol 33 (25) ◽  
pp. 5902 ◽  
Author(s):  
G. E. Holland ◽  
J. F. Seely ◽  
R. P. McCoy ◽  
K. F. Dymond ◽  
C. Rollins ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Extreme Ultraviolet ◽  
Energetic Electron ◽  
Ultraviolet Region ◽  
Proton Bombardment

scholarly journals Phase-matched four-wave mixing in the extreme ultraviolet region

2018 ◽  
Vol 124 (1) ◽  
pp. 015901 ◽  
Author(s):  
Khoa Anh Tran ◽  
Khuong Ba Dinh ◽  
Peter Hannaford ◽  
Lap Van Dao
Keyword(s):  
Extreme Ultraviolet ◽  
Four Wave Mixing ◽  
Ultraviolet Region ◽  
Wave Mixing

Time-Resolved Magnetic Resonance Angiography for Follow-Up of Treated Dural and Epidural Spinal Arteriovenous Fistula

2021 ◽  
Author(s):  
Giovanni Giulio Vercelli ◽  
Fabrizio Venturi ◽  
Massimiliano Minardi ◽  
Fabio Cofano ◽  
Francesco Zenga ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Vascular Malformations ◽  
High Sensitivity ◽  
Recurrence Time ◽  
Venous Plexus ◽  
Time Resolved ◽  
Arteriovenous Fistulas ◽  
Spinal Arteriovenous Fistula

Abstract Background Spinal arteriovenous fistulas (AVFs) are uncommon vascular malformations of spinal dural and epidural vessels. Actually digital subtraction angiography (DSA) is the gold standard for diagnosis and follow-up. The aim of this study is to demonstrate the validity of the multiphasic magnetic resonance angiography (MRA) to identify recurrent/residual AVFs or their correct surgical and/or endovascular closure. Methods A retrospective cases series with perimedullary venous plexus congestion due to spinal dural or epidural AVF was performed at our center from April 2014 to September 2019. After 1 month from treatment, the patients were subjected to time-resolved MRA and DSA to demonstrate recurrence or correct closure of AVFs. Results We collected a series of 26 matched time-resolved MRA and DSA in 20 patients who underwent an endovascular and/or surgical procedure. In our series, we reported five cases of recurrence. Time-resolved MRA detected six cases of recurrence, with 100% sensitivity and 95% specificity (p < 0.001). We used DSA as the standard reference. Conclusion Time-resolved MRA is a valid tool in posttreatment follow-up to detect recurrent or residual AVFs. It has high sensitivity and specificity and may replace DSA.

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