... ablation areas, where accumulation equals ablation, is the equilibrium line . When accumulation exceeds ablation, the glacier increases ... the region (Riedel and Burrows, 2005). ...
NBII National Biological Information Infrastructure
... of the propellant ablation under plasma effect based on ... Knudsen layer and the hydrodynamic layer. ... indicate that the ablated mass increases with ...
DTIC Science & Technology
The structural performance of several candidate ablatives for the uptake section of the Navy's Vertical Launching System is investigated. The uptake is modeled using a fixed-fixed beam-loaded by a uniform pressure. Beam displacement field equations are solved, assuming that the ablatives exhibit bimodular behavior in tension and compression. The candidate ...
NASA Astrophysics Data System (ADS)
The purpose of this study was to investigate the effect of liquid thickness on laser ablation efficiency. Both Q-switched Nd:YAG (yttrium aluminum garnet) and free-running Er:YAG lasers were used to ablate polymethyl-methacrylate samples in the presence of a water layer. The thickness of the liquid layer varied from 500 {mu}m to 3 mm. ...
Energy Citations Database
The purpose of this study was to investigate the effect of liquid thickness on laser ablation efficiency. Both Q-switched Nd:YAG (yttrium aluminum garnet) and free-running Er:YAG lasers were used to ablate polymethyl-methacrylate samples in the presence of a water layer. The thickness of the liquid layer varied from 500 ?m to 3 mm. ...
Owing to an increased use of diagnostic imaging for evaluating patients with other abdominal conditions, incidentally discovered kidney masses now account for a majority of renal tumors. Renal ablative therapy is assuming a more important role in patients with borderline renal impairment. Renal ablation uses heat or cold to bring about ...
PubMed Central
... Density charring systems were modified to increase the systems resistance both to ... unit size of fillers; and post-cure vacuum impregnation of ablator ...
Apr 30, 1997 ... Ablative material sample prior to testing. The increasing demand for a low-cost, reliable way to launch commercial payloads to low-Earth ...
NASA Website
The ablative characteristics of polyethylene and four substituted hydrocarbons were examined in arc heated air. The order of increasing penetration rates was polytetrafluoroethylene, a tetrafluoroethylene-hexafluoropropylene copolymer, polychlorotrifluoro...
National Technical Information Service (NTIS)
Initial reports have suggested that proximity of liver tumors to the gallbladder may increase the risk for cholecystitis after radiofrequency ablation. A colon adenocarcinoma metastasis to the liver in contact with the gallbladder was successfully treated with radiofrequency ablation without subsequent cholecystitis.
Thermal tissue ablation is an interventional procedure increasingly being used for treatment of diverse medical conditions. Microwave ablation is emerging as an attractive modality for thermal therapy of large soft tissue targets in short periods of time, making it particularly suitable for ablation of hepatic and ...
Atrial Fibrillation (AF) is an increasingly common and costly medical problem.1�3 Given the disappointing efficacy and side effects associated with pharmacological therapy for AF, new treatment options are needed. Over the last decade, advances in our understanding of the mechanisms of AF, coupled with iterative improvements in catheter ablation ...
Background: Plasma remnant-like particle-cholesterol (RLP-C) and RBC omega-3 index are novel risk factors for cardiovascular disease. Effects of docosahexaenoic acid (DHA) supplementation on these risk factors in hypertriglyceridemic men have not been studied. Objective: We determined effects of DHA...
Technology Transfer Automated Retrieval System (TEKTRAN)
The major dietary source of docosahexaenoic acid (DHA) is fish, which is not widely consumed by children. There is concern, therefore, that children may not receive adequate DHA and so might benefit from dietary supplementation. The aim of the present study was to evaluate the effects of providing a...
Catheter ablation is increasingly used to treat patients with atrial fibrillation (AF). Ablation of ganglionic plexi is often performed to reduce vagal innervation and has been shown to confer a better long-term outcome in terms of AF recurrence. We report a case of a patient having AF ablation with a profound ...
BACKGROUND: Bimodal electric tissue ablation (BETA) is a new technique that uses the direct current in electrolysis to improve the efficacy of radio frequency (RF) ablation. It was hypothesized that attaching the cathode of the electrolytic circuit to the RF electrode will increase the tissue hydration, therefore delaying tissue ...
PubMed
Laser ablation of aluminum metal with 1 ns, 800 nm pulse at low radiant exposures was investigated in air (dry) and water (wet) environments. Compared to dry ablation, an approximately eight times increase in material removal rate was associated with wet ablation. Based on optical reflectance and scanning electron ...
Ablation of paroxysmal AF in symptomatic patients is a clear indication after failure of anti-arrhythmic therapy (class IIa according to the recommendations). Ablation of persistent AF is feasible, as second line after failure of medical treatment, although there is no real consensus on ablative techniques : this procedure is long and ...
Ablation yields and thresholds for 193 nm UV laser ablation of ultrathin HfO2 are presented. The single shot threshold fluence increases approximately linearly with HfO2 thickness form 28 nm to 120 nm. Due to the logarithmic dependence of ablation depth on fluence this result with increasing ...
Radiofrequency ablation (RFA) has been used for over 18 years for treatment of nerve-related chronic pain and cardiac arrhythmias. In the last 10 years, technical developments have increased ablation volumes in a controllable, versatile, and relatively inexpensive manner. The host of clinical applications for RFA have similarly ...
OBJECTIVE: This report reviews the current clinical status of percutaneous ablation of hepatocellular carcinoma (HCC). CONCLUSION: HCC is increasing in incidence. Multiple percutaneous ablation methods are now available for primary treatment or for bridging to transplantation. Percutaneous ethanol instillation and radiofrequency ...
for KrF and XeCl excimer laser ablation of YBa,Cu30Y_xtargets in vacuum, XeF excimer laser ablation I2913. RESULTS AND DISCUSSION ISrF and XeCl excimer laser ablation of YE5a2Cu307-xtargets show with increasing irradiance ll. Excimer laser ablation of copper also has been extensively studied by ...
E-print Network
... cases, increased yields of carbonaceous residue were ... elastomeric insulating materials showed the ... in an ablating elastomeric insulating material. ...
In femtosecond laser ablation the plume has two components: a faster-moving plasma part and a slower nanoparticle plume which contains most of the ablated material. This paper describes the results of experiments to comprehensively characterize the plume in laser ablation of Ni with {approx_equal}300 fs pulses at 527 nm. Both ...
In femtosecond laser ablation the plume has two components: a faster-moving plasma part and a slower nanoparticle plume which contains most of the ablated material. This paper describes the results of experiments to comprehensively characterize the plume in laser ablation of Ni with ~300 fs pulses at 527 nm. Both single-pulse and ...
Copper targets are irradiated in the ablation regime by pairs of equal, time-delayed collinear laser pulses separated on a timescale going from ~2 ps to ~2 ns. The ablation plume is characterized by ion probe diagnostic, fast imaging, and temporally and spatially resolved optical emission spectroscopy. The variation in the ablation ...
This paper describes the use of double-pulse laser ablation to improve ICP-MS internal precision (temporal relative standard deviation, %TRSD). Double pulse laser ablation offers reduced fractionation, increased sensitivity, and improved signal to noise ratios. The first pulse is used to ablate a large quantity of ...
Beside heart failure and metabolic syndrome, atrial fibrillation is termed the cardiovascular epidemic of the 21 st century. Its increased morbidity and mortality is alarming. The present, most effective therapy of atrial fibrillation is catheter ablation. Successful ablation of atrial fibrillation prevents the occurrence and ...
Catheter ablation has been established as a potentially curative treatment modality for various arrhythmias. Over the past years, catheter ablation has progressed from focal ablation to complex ablations within a three-dimensional anatomy for the treatment of ventricular tachycardia or atrial fibrillation. Complex ...
Recent work has brought about a renewed interest in CO2 laser ablation studies of polyoxymethylene, due to its potential as a test target for enhancing modern understanding of the laser ablation process. In this paper, new results taken in air at atmosphere pressure are reported, including data measured at institutions in Germany and Japan, which ...
Image-guided tumor ablation with both thermal and nonthermal sources has received substantial attention for the treatment of many focal malignancies. Increasing interest has been accompanied by continual advances in energy delivery, application technique, and therapeutic combinations with the intent to improve the efficacy and/or specificity of ...
Poly(methyl methacrylate) (PMMA) is highly resistant to laser ablation at 308 nm. Either very high fluences or absorbing dopants must be used to ablate PMMA efficiently at this wavelength. We investigate two dopants, pyrene and a common solvent, chlorobenzene, using time-of-flight mass spectroscopy. Both compounds improve the ablation ...
Carious dentine and enamel from extracted human teeth were ablated using a semiconductor diode laser in conjunction with an applied dye, indocyanine green. This technique offers selective ablation with minimal risk of thermal damage to surrounding dental tissues because uptake of the dye and its irradiation by the laser together control the ...
