A study is reported in which standard NATO 7.62mm ammunition with and without ablative fluid modification, was tested for effects on barrel temperatures and erosion. This modified ammunition is characterized by a Neoprene capsule containing silicone fluid...
National Technical Information Service (NTIS)
... AND ABLATION PROGRAM (CMA) FOR CARBON ABLATION ANALYSIS C. CH AN DTIC LECTE ... I AND ABLATION PROGRAM (CMA) FOR ...
DTIC Science & Technology
... Title : Modifications to the Aerotherm Charring Material Thermal Response and Ablation Program (CMA) for Carbon Ablation Analysis. ...
Subdiffraction spatially resolved, quantitative mapping of strongly localized field intensity enhancement on gold nanostructures via laser ablation of polymer thin films is reported. Illumination using a femtosecond laser scanning microscope excites surface plasmons in the nanostructures. The accompanying field enhancement substantially lowers the ablation ...
NASA Astrophysics Data System (ADS)
The solution of the conventional Rayleigh-Plesset equation did not agree with the experimental results on the temporal variations of the sizes of cavitation bubbles produced by laser ablation in water. In this work, we modified the conventional Rayleigh-Plesset theory in the following two points to reproduce the experimental observation theoretically. One was to introduce the ...
The objective of this study was to understand the dominant mechanism(s) for dental enamel ablation with the application of water spray. A free-running Er,Cr:YSGG (yttrium, scandium, gallium, garnet) laser was used to ablate human enamel tissue at various radiant exposures. During dental ablation, distilled water was sprayed on the ...
PubMed
Irradiation effects at low and high laser fluence on 2,5-dihydroxybenzoic acid large crystals were investigated. Contrary to what was observed for matrices as cinnamic acid derivatives, no chemical degradation of matrix is evidenced and continuous ablation as well as ion production resulted of extended irradiation in all the fluence range corresponding to ...
Modification of atrioventricular node is a usual and necessary operation to cure atrioventricular nodal reentrant tachycardia (AVNRT). In this operation, atrioventricular block is the most severe complication and its prevention is of our great concern. This complication always occurs under some special circumstances with potential risk. So, it is very important to realize such ...
OBJECTIVES: To present the results of biopsy and computed tomography (CT) guided radiofrequency ablation (RFA) for non-spinal osteoid osteomas, and compare the results before and after procedural modifications. METHODS: We retrospectively studied 557 patients with non-spinal osteoid osteomas treated with biopsy and CT-guided RFA. In 68 patients we used ...
At the time of antiarrhythmic surgery, cryothermal energy application by a hand-held probe was used to complement dissections and resections and permanently abolish the arrhythmogenic substrate. Over the last decade, significant engineering advances allowed percutaneous cryoablation based on catheters, apparently not very different from standard radiofrequency ablation ...
PubMed Central
... TITLE: Effects of Androgen Ablation on Anti-tumor Immunity ... 5a. CONTRACT NUMBER Effects of Androgen Ablation on Anti-tumor Immunity 5b. ...
... Accession Number : ADD411036. Title : The Effect of Ablation Products on Gemini Reentry Communications,. Corporate ...
... Accession Number : ADA023898. Title : Graphite Ablation Chemistry Nonequilibrium Effects. Descriptive Note : Final rept. ...
... FOREIGN TECHNOLOGY DIVISION CARBON/CARBON COMPOSITION ABLATION EFFECTS ON IONIZED BOUNDARY LAYERS by ...
... Accession Number : AD0668623. Title : ABLATION AND THERMAL EFFECTS IN A VISCOELASTIC CYLINDER. Descriptive Note : Technical rept.,. ...
Osteoid osteoma is a small benign tumor, with a ''nidus'' that rarely exceeds 15 mm in diameter. It is relatively common in males, especially teenagers and young adults. It involves mainly the appendicular skeleton, the femur in particular, and rarely the axial skeleton. It requires treatment because it causes intense pain. In recent years alternative, less invasive, treatments have been proposed, ...
... foil targets are ablatively accelerated by a multi-nanosecond Nd ... accelerating target. ... laser beam requirements for uniform ablative acceleration. ...
Short-pulsed lasers have been proven to be useful tools for precise modification of electronic materials. In conventional lens focusing schemes, the minimum feature size is determined by the diffraction limit. Finer resolution is accomplished by combining pulsed laser radiation with near-field scanning optical microscopy (NSOM) probes. In this study, short laser pulses are ...
We perform direct measurement of the thermal energy remaining in the bulk of Cu, Mg, Au, and Si samples following multi-pulse femtosecond laser ablation. In contrast to the previous belief that the thermal energy remaining in the ablated sample is negligible using femtosecond pulses, we show a significant amount of residual thermal energy deposited in ...
Energy Citations Database
... of choice for ablation or modification of AV nodal function and ... MICROWAVES AND WHITE NOISE ON NEUROLOGICAL FUNCTIONS IN THE RAT. ...
Surface modification of root dentin by mid-infrared (MIR) pulsed-laser irradiation is one of the candidates for a novel, non-invasive treatment to prevent root surface caries. To modify root dentin effectively and non-invasively it is essential to estimate quantitatively and qualitatively the laser parameters, such as the wavelength and the power density, ...
... of Graphite/Epoxy Composite Material. ... ABLATION, *EPOXY COMPOSITES, REMOVAL ... Categories : LAMINATES AND COMPOSITE MATERIALS. ...
... of the propellant ablation under plasma effect based on ... Knudsen layer and the hydrodynamic layer. ... indicate that the ablated mass increases with ...
The presence of hydrodynamic fluid instability at the ablation surface puts constraints on the kinds of targets, surface finish, and energy sources that one can use for thermonuclear micro-implosions. If Taylor-like modes grow at near the classical value, one is limited to low aspect ratio shells and surface finishes of 10-100 A. These surface finish requirements can be ...
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 ...
The author's theory of dynamic viscous pressure interaction has been extended to cases with surface ablation by sublimation. It has been shown that the two very large and opposite effects of aftbody ablation and forebody ablation on pitch damping of a sle...
Pulsed CO(2) lasers have been shown to be effective for both removal and modification of dental hard tissue for the treatment of dental caries. In this study, sealed transverse excited atmospheric pressure (TEA) laser systems optimally tuned to the highly absorbed 9.6 microm wavelength were investigated for application on dental hard tissue. Conventional ...
Pulsed CO2 lasers have been shown to be effective for both removal and modification of dental hard tissue for the treatment of dental caries. In this study, sealed TEA laser systems optimally tuned to the highly absorbed 9.6 micrometers wavelength were investigated for application on dental hard tissue. Conventional TEA lasers produce a laser pulse wit a ...
Pulsed CO2 lasers have been shown to be effective for both removal and modification of dental hard tissue for the treatment of dental caries. In this study, sealed transverse excited atmospheric pressure (TEA) laser systems optimally tuned to the highly absorbed 9.6 micrometers wavelength were investigated for application on dental hard tissue. ...
... EOEAAD]2.0.CO;2 EFFECTS OF EYESTALK ABLATION AT DIFFERENT TIMES OF THE YEAR ON MOLTING ... Abstract The effect of unilateral an...
NBII National Biological Information Infrastructure
The effects of ablation on re-entry body dynamics is a problem that during recent years has advanced from one of general interest to one of general concern. An exploratory analysis shows that ablation will have opposite effects on static and dynamic stabi...
This study evaluated the process of ablation produced by a Ti:Sapphire femtosecond laser under different average powers taking place at the enamel/dentin interface. Based on the geometry of ablated microcavities the effective intensity for ablation was obtained. This study shows the validity for the local ...
Surface modification of stainless-steel was carried out by two different methods: pulsed laser ablation deposition (PLAD) and a combined plasma/gamma process. A potential application was the surface modification of endovascular stents, to enhance biocompatibility. The pulsed laser ablation deposition process, had ...
... Title : EFFECTS OF POROSITY AND STRUCTURE OF GRAPHITE MATERIALS ON ABLATION IN ARC GENERATED PLASMAS,. ...
An investigation of ablation materials was conducted for application to an advanced, Mach 8 modification of the X-15 Research Airplane. Performance of the selected material, thermo-lag T-500, was evaluated in plasma tunnel tests and in flight tests. Estim...
... Effects in the Ultraviolet-Laser Ablation of Polycarbonate and Poly(Alpha- Methylstyrene) Examined by Time-of-Flight Mass Spectroscopy. ...
... Title : Rocket Motor Blast Effects and Proposed Ablative ... the launcher and/or deck surface. ... TESTS, ADHESIVES, SHIP DECKS, ROCKET EXHAUST ...
Environmental and ablator performance uncertainties effects on heat shielding requirements for blunt
NASA Technical Reports Server (NTRS)
Page 1. AD Award Number: DAMD17-02-1-0244 TITLE: Effects of Androgen Ablation on Anti-tumor Immunity PRINCIPAL ...
... Effects of Androgen Ablation on Anti-Tumor Immunity. ... The induction of apoptotic cell death in ... infiltrate comprised predominantly of activated T cells. ...
... Title : Cumulative Effect Near Ablation Threshold of Polymer by 308-nm Excimer Laser Pulse. Descriptive Note : Journal article,. ...
2D LASNEX simulations indicate that polar angle- and depth-dependent doping of inertial fusion capsule ablators can effectively compensate for radiation drive asymmetries [1]. We present simulations of a NIF capsule design [2] with variable in-depth doping to compensate for low order radiation asymmetry modes. Such symmetry compensated capsules could allow ...
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. ...
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. ...
The works devoted to the formation and modification of nanoparticles using laser ablation of solid targets in liquids are reviewed. Several approaches to implement laser ablation in liquids, aimed at synthesising nanoparticles of complex composition, are considered: direct laser ablation of a target of ...
1. Echo-location and evoked potentials of blinded Yuma bats (Myotis yumanensis) were studied before and after ablation of the inferior colliculus (I.C.). A task of obstacle-avoidance was given to the bats: hits and misses of strands in the flight path were counted. Orientation sounds emitted by the bats during flight were recorded.2. Bilateral ablation of ...
1. Echo-location and evoked potentials of blinded Yuma bats (Myotis yumanensis) were studied before and after ablation of the inferior colliculus (I.C.). A task of obstacle-avoidance was given to the bats: hits and misses of strands in the flight path were counted. Orientation sounds emitted by the bats during flight were recorded. 2. Bilateral ablation of ...
The transient ablation process for nonradiating glassy materials is discussed, and numerical calculations are presented for quartz along an ICBM trajectory. It is shown that the transient effects do not appreciably affect the amount of ablated material along the trajectory but that they very significantly affect the amount of ...
Management of atrial fibrillation (AF) has changed greatly in the past 10 years. The advent of a greater understanding of the pathophysiology of AF has resulted in major therapeutic breakthroughs, both in invasive and non-invasive strategies. New antiarrhythmic agents with fewer side effects, new anticoagulants and technical advances in ablation have ...
Two cases of inappropriate sinus tachycardia refractory to combined pharmacotherapy (beta-blocker, ivabradine) are described. Both were female patients (28 and 45 years-old) and underwent sinus node modification/ablation using non-contact mapping (EnSite Array). Since ablation had to be performed in both cases very close to the phrenic nerve (captured ...
Although ethanol ablation has been successfully used to treat cystic thyroid nodules, this procedure is less effective when the thyroid nodules are solid. Radiofrequency (RF) ablation, a newer procedure used to treat malignant liver tumors, has been valuable in the treatment of benign thyroid nodules regardless of the extent of the ...
Pellet ablation rates computed with the help of different ablation models are compared. For investigating the response of the plasma to the injected pellet, the ablation models are combined with a multiregime tokamak transport code. The results indicate that the ionization dynamics of the ablated particles has a ...
Persistent changes in spine shape are coupled to long-lasting synaptic plasticity in hippocampus. The molecules that coordinate such persistent structural and functional plasticity are unknown. Here, we generated mice in which the cell adhesion molecule N-cadherin was conditionally ablated from postnatal, excitatory synapses in hippocampus. We applied to adult mice of either ...
