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Results for “DRILLING”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Realtime sensing and monitoring while drilling using the USDC with integrated sensors
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Realtime sensing while drilling using the USDC and integrated sensors
The search for existing or past life in the universe is one of the most important objectives of NASA's mission. In support of this objective, an ultrasonic based mechanism is being developed to allow probing and sampling of rocks and soil.
Optimal tune in ultrasonic drilling with body sensor
An Ultrasonic drilling/coring mechanism (USDC) has been developed for future NASA exploration missions.
Microwave Brazing of TSP Diamond Drill Bit Cutters
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Mars Deep Drill -- a mission concept for the next decade
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Novel horn designs for ultrasonic/sonic cleaning welding, soldering, cutting and drilling
The experimental results for a variety of novel horn designs will be presented and compared to the results predicted by theory.
Novel horn designs for ultrasonic/sonic cleaning welding, soldering, cutting and drilling
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Coal combustion by-products and shale gas well drill cuttings as plant growth media for green roofs – results of roof experiments
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Trace Metal Distribution and Mobility in Drill Cuttings from Marcellus Shale Gas Extraction
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Ruggedized Communication Technology for Enabling High-Temperature Directional Drilling
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Robust Cost-Effective Characterization of Petrophysical Properties in Sedimentary Geothermal Applications Leveraged by Drilling Data and Cuttings
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The Atomic Drill Bit: Precision Controlled Atomic Fabrication of 2D Materials
The ability to deterministically fabricate nanoscale architectures with atomic precision is the central goal of nanotechnology, whereby highly localized changes in the atomic structure can be exploited to control device properties at their fundamental physical limit. Here, an automated, feedback-controlled atomic fabrication method is reported and the formation of 1D–2D heterostructures in MoS 2 is demonstrated through selective transformations along specific crystallographic orientations. The atomic-scale probe of an aberration-corrected scanning transmission electron microscope (STEM) is used, and the shape and symmetry of the scan pathway relative to the sample orientation are controlled. The focused and shaped electron beam is used to reliably create Mo 6 S 6 nanowire (MoS-NW) terminated metallic-semiconductor 1D–2D edge structures within a pristine MoS 2 monolayer with atomic precision. From these results, it is found that a triangular beam path aligned along the zig-zag sulfur terminated (ZZS) direction forms stable MoS-NW edge structures with the highest degree of fidelity without resulting in disordering of the surrounding MoS 2 monolayer. Density functional theory (DFT) calculations and ab initio molecular dynamic simulations (AIMD) are used to calculate the energetic barriers for the most stable atomic edge structures and atomic transformation pathways. These discoveries provide an automated method to improve understanding of atomic-scale transformations while opening a pathway toward more precise atomic-scale engineering of materials.
Multiphase Flow in Porous Media: Cake Formation During Extreme Drilling Processes
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Catheter-Directed Fenestration for Branch Vessel Reconnection in Aortic Dissection Using a Novel Diamond-Tipped Chronic Total Occlusion Drilling Device: A Technical Report
Purpose: Aortic dissection is a complex condition with high morbidity and mortality. Endovascular treatments including percutaneous fenestration can be used to manage branch vessel ischaemia or risk of aortic rupture. A variety of techniques for aortic fenestration have been described. We describe the novel use of the TruePath Chronic Total Occlusion (CTO) device for aortic intimal fenestration to achieve side branch reconnection. Materials and Methods: We present three cases of aortic dissection presenting with symptoms of aortic side branch occlusion and end organ malperfusion, treated with aortic fenestration using the TruePath CTO device via trans-brachial and trans-femoral approaches. Results: Technical success was achieved in all three cases. No complications were encountered. Flow was restored in compromised visceral branches. Branches remained patent on follow-up CT angiography over a minimum 2.5-year follow-up period. Conclusion: Percutaneous aortic fenestration techniques enable a minimally invasive approach to treat visceral branch malperfusion associated with aortic dissection. The TruePath CTO device improves the control of the fenestration procedure with the potential to improve efficacy and safety.
Interfacial Characteristics Investigation for One-Step EDM Drilling of Cooling Holes in TBCs
In this study, the one-step electrical discharge machining of inclined cooling holes is performed in thermal-barrier-coated nickel-based superalloys via the assisting electrode method. The effects of the process parameters, including the inclination angle, peak current, pulse duration, and duty cycle, on interfacial characteristics of cooling holes were investigated. The research results are as follows: After machining, the hardness of TBCs increases slightly and the adhesion strength of ceramic coating has a slight reduction. Delamination prevailingly appears at the ceramic coating/bonding coating interface, and its length at the trailing edge is greater than that at the leading edge. Increasing either the discharge energy or the duty cycle also aggravates the severity of the delamination. Under an excessive peak current of 22.5 A, the complete spalling of the ceramic coating occurs in the vicinity of the holes. Additionally, a reduction in the inclination angle results in a significant increase in delamination cracking and poorer interface integrity. The interfacial microstructure features of the holes vary with the inclination angle. The large-scale spalling of ceramic coating is prone to occur at the trailing edge when using an inclination angle of 30°. The spattering is susceptible to appear at the entrance of the holes under inclination angles of 60° and 75°, and its composition is primarily Ni, C, Zr, Cr, Nb, Fe, and Cu.