Effect of pulse number on the ablation rate of metals in PLA multipulse regime

2010 ◽  
Author(s):  
C. Negutu ◽  
I. Vladoiu ◽  
M. Stafe ◽  
A. Rizea ◽  
N. N. Puscas ◽  
...  
Keyword(s):  
Ablation Rate ◽  
Pulse Number

Picosecond Laser Ablation of Polydimethylsiloxane (PDMS)

2009 ◽  
Author(s):  
Hansong Zeng ◽  
Yi Zhao ◽  
Benxin Wu ◽  
Chris Taylor ◽  
Ronald L. Jacobsen ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Laser Fluence ◽  
Picosecond Laser ◽  
Ablation Rate ◽  
Pulse Number ◽  
Hole Diameter ◽  
Replica Molding

Picosecond laser ablation of Polydimethylsiloxane (PDMS) has been studied experimentally. The measurements show that laser ablation rate per pulse increases with laser fluence and pulse number. The laser-drilled hole diameter increases with pulse number, and it saturates above certain pulse number for low fluence. The study shows that picosecond laser ablation may provide a good solution for micromachining PDMS, which is more flexible and versatile than the replica molding technique.

scholarly journals Determining the optimal pulse number for theta burst induced change in cortical excitability

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel M. McCalley ◽  
Daniel H. Lench ◽  
Jade D. Doolittle ◽  
Julia P. Imperatore ◽  
Michaela Hoffman ◽  
...  
Keyword(s):  
Cortical Excitability ◽  
Motor Evoked Potentials ◽  
Pulse Number ◽  
Theta Burst Stimulation ◽  
Burst Stimulation ◽  
Non Invasive ◽  
Subject Variability ◽  
Secondary Analyses ◽  
Effective Doses ◽  
Theta Burst

AbstractTheta-burst stimulation (TBS) is a form of non-invasive neuromodulation which is delivered in an intermittent (iTBS) or continuous (cTBS) manner. Although 600 pulses is the most common dose, the goal of these experiments was to evaluate the effect of higher per-dose pulse numbers on cortical excitability. Sixty individuals were recruited for 2 experiments. In Experiment 1, participants received 600, 1200, 1800, or sham (600) iTBS (4 visits, counterbalanced, left motor cortex, 80% active threshold). In Experiment 2, participants received 600, 1200, 1800, 3600, or sham (600) cTBS (5 visits, counterbalanced). Motor evoked potentials (MEP) were measured in 10-min increments for 60 min. For iTBS, there was a significant interaction between dose and time (F = 3.8296, p = 0.01), driven by iTBS (1200) which decreased excitability for up to 50 min (t = 3.1267, p = 0.001). For cTBS, there was no overall interaction between dose and time (F = 1.1513, p = 0.33). Relative to sham, cTBS (3600) increased excitability for up to 60 min (t = 2.0880, p = 0.04). There were no other significant effects of dose relative to sham in either experiment. Secondary analyses revealed high within and between subject variability. These results suggest that iTBS (1200) and cTBS (3600) are, respectively, the most effective doses for decreasing and increasing cortical excitability.

scholarly journals Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5040
Author(s):  
Silvia Ronda Peñacoba ◽  
Mar Fernández Gutiérrez ◽  
Julio San Román del Barrio ◽  
Francisco Montero de Espinosa
Keyword(s):  
Short Pulse ◽  
Pulse Repetition Frequency ◽  
Pulse Number ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
Treatment Protocols ◽  
Culture Plate ◽  
New Treatment ◽  
Long Pulse

Despite the use of therapeutic ultrasound in the treatment of soft tissue pathologies, there remains some controversy regarding its efficacy. In order to develop new treatment protocols, it is a common practice to carry out in vitro studies in cell cultures before conducting animal tests. The lack of reproducibility of the experimental results observed in the literature concerning in vitro experiments motivated us to establish a methodology for characterizing the acoustic field in culture plate wells. In this work, such acoustic fields are fully characterized in a real experimental configuration, with the transducer being placed in contact with the surface of a standard 12-well culture plate. To study the non-thermal effects of ultrasound on fibroblasts, two different treatment protocols are proposed: long pulse (200 cycles) signals, which give rise to a standing wave in the well with the presence of cavitation (ISPTP max = 19.25 W/cm2), and a short pulse (five cycles) of high acoustic pressure, which produces a number of echoes in the cavity (ISPTP = 33.1 W/cm2, with Pmax = 1.01 MPa). The influence of the acoustic intensity, the number of pulses, and the pulse repetition frequency was studied. We further analyzed the correlation of these acoustic parameters with cell viability, population, occupied surface, and cell morphology. Lytic effects when cavitation was present, as well as mechanotransduction reactions, were observed.

scholarly journals Femtosecond laser volume ablation rate and threshold measurements by differential weighing

2012 ◽  
Vol 20 (28) ◽  
pp. 29900 ◽  
Author(s):  
D Pietroy ◽  
Y Di Maio ◽  
B Moine ◽  
E Baubeau ◽  
E Audouard
Keyword(s):  
Femtosecond Laser ◽  
Ablation Rate

scholarly journals Thermodynamic Investigations on the Laser Ablation Rate of Silicon over Five Fluence Decades

2013 ◽  
Vol 41 ◽  
pp. 640-649 ◽  
Author(s):  
V. Schütz ◽  
U. Stute ◽  
A. Horn
Keyword(s):  
Laser Ablation ◽  
Ablation Rate

CONTROLLING ABOVE-THRESHOLD DISSOCIATION BRANCHING RATIOS OF HD+ WITH FEMTOSECOND LASER PULSE TRAIN

2012 ◽  
Vol 11 (04) ◽  
pp. 709-721 ◽  
Author(s):  
QIAN-ZHEN SU ◽  
JIE YU ◽  
KAI-JUN YUAN ◽  
SHU-LIN CONG
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Pulse Train ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Pulse Number ◽  
Molecular Ions ◽  
Quantum Wave ◽  
Energy Dependent

Above-threshold dissociation (ATD) process of the molecular ions HD+ steered by a femtosecond laser pulse train (LPT) is investigated theoretically using the time-dependent quantum wave packet method. Energy-dependent distributions of ATD fragments are analyzed by using an asymptotic-flow expression in the momentum space. It is found that fragment kinetic energy spectra shift to low energy region with increasing pulse number of LPT. The photofragment branching ratio between the 1sσg and 2pσu dissociation channels is sensitive to the pulse number of LPT. The momentum distribution of the ATD fragments is discussed in detail.

scholarly journals Ablation rate after radioactive iodine therapy in patients with differentiated thyroid cancer at intermediate or high risk of recurrence: a systematic review and a meta-analysis

2021 ◽  
Author(s):  
Michele Klain ◽  
Carmela Nappi ◽  
Emilia Zampella ◽  
Valeria Cantoni ◽  
Roberta Green ◽  
...  
Keyword(s):  
Systematic Review ◽  
Thyroid Cancer ◽  
High Risk ◽  
Differentiated Thyroid Cancer ◽  
Meta Analysis ◽  
Ablation Rate ◽  
Intermediate Risk ◽  
Risk Of Recurrence ◽  
Successful Ablation ◽  
Risk Patients

Abstract Purpose We performed a systematic review and a meta-analysis to investigate the successful ablation rate after radioiodine (RAI) administration in patients with differentiated thyroid cancer (DTC) at intermediate-high risk of recurrence. Methods A comprehensive literature search of the PubMed, Scopus, and Web of Science databases was conducted according to the PRISMA statement. Results The final analysis included 9 studies accounting for 3103 patients at intermediate-high risk of recurrence. In these patients, the successful ablation rates ranged from 51 to 94% with a 71% pooled successful ablation and were higher in intermediate (72%) than in high (52%)-risk patients. Despite the rigorous inclusion standards, a significant heterogeneity among the evaluated studies was observed. Higher administered RAI activities are associated with a lower successful ablation rate in the whole population and in the subgroup of high-risk patients. Furthermore, pooled recurrence rate in intermediate-risk patients achieving successful ablation was only 2% during the subsequent 6.4-year follow-up while the pooled recurrence rate was 14% in patients who did not achieve a successful ablation. Conclusion In a large sample of 3103 patients at intermediate-high risk of persistent/recurrent disease, 71% of patients achieved a successful ablation. In these intermediate-risk patients, the probability of subsequent recurrence is low and most recurrence occurred in those with already abnormal findings at the first control.

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