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Showing 1 to 20 of 296 for “"Sheath"”.
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Sheath currents, sheath losses, induced sheath voltages and apparent conductor impedances of metal sheathed cables carrying alternating currents
When lead sheathed single conductor cables are used on alternating current circuits new problems are introduced such as induced sheath voltages and sheath losses. In this thesis it is proposed to consider sheath voltages, currents and losses and line constants for one or two circuits of single …
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Selective Deuteron Acceleration using Target Normal Sheath Acceleration
… selective deuteron acceleration by target normal sheath acceleration (TNSA), in which the normally dominant contaminant proton and carbon ion signals are suppressed by orders of magnitude relative to the deuteron signals is reported. Using a laser pulse with 0.5 J, 120 fs duration, and ~5 x …
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Electron Sheath Extraction of Ions From a Plasma
Made available in DSpace on 2014-12-10T19:06:51Z (GMT). No. of bitstreams: 1 7212183.pdf: 2824515 bytes, checksum: 4fda2e3fbce9f56fd6f06f6419137583 (MD5) Previous issue date: 1971
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The Effects of Collisions on Plasma-Sheath Transition
The plasma sheath is essential for understanding the plasma-material interaction (PMI) since it regulates the plasma particle and energy fluxes to the wall. The key concept in sheath theory is the Bohm criterion that gives the lower bound of the plasma exit flow speed, also known as the Bohm speed. …
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RESONANCE in radio frequency sheath admittance in nuclear fusion scenarios
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Percutaneous Puncture of Flexor Sheath Ganglions: An Assessment of Recurrence
Background Flexor tendon sheath ganglions (FTSG) comprise up to 15% of hand ganglions. The management is split between two schools of practice: percutaneous puncture or surgical excision. The literature is equivocal as to which holds true superiority in terms of recurrence rates. The cost of …
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The effect of a plasma sheath on hypersonic flight communications
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Impact of ion-neutral collisions in fluid models of plasma sheath
… of argon plasmas in DC discharges, including the sheath regions, is presented. Comparison of the charged species density, electron mean energy, plasma potential and ion velocity profiles with the profiles obtained by other fluid models and the profiles obtained with 1D3V (one dimension in space …
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Observation of plasma sheath modulation in the plasma bipolar junction transistor
Modulation of the plasma sheath in a plasma bipolar junction transistor (PBJT) is observed for base inputs of less than one volt. Using the recorded data, along with a collisional, high-voltage sheath model developed herein, a 359% increase in the secondary electron emission coefficient of the …
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The study of overlapping sheath and dust particle structures in dusty plasma.
… plasma no longer exists is called the plasma sheath. Due to the perturbative nature of the majority of diagnostics in common use, such sheaths, especially the sheath forming near surfaces, can exhibit complex geometries making their physics difficult to diagnose. In such plasma sheath, the …
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Therapeutic Targeting Of Bmp2 In Nf1-Deficient Malignant Peripheral Nerve Sheath Tumors (mpnsts)
… I (NF1)-deficient malignant peripheral nerve sheath tumor (MPNST) is an aggressive tumor for which the standard treatment is surgical removal with wide margins, often leaving behind cancer cells needing chemotherapy. RAS-GRD is the most widely studied functional target of NF1 implicated in …
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Real-time monitoring of cement sheath integrity under high-angle HPHT wellbore conditions.
… wells, in conjunction with the annular cement sheath, need to prevent leakages well beyond the life of the wellbore. The results of a recent engineering study of 15,500 wellbores in the Gulf of Mexico show that, as a wellbore turns fifteen years of age, it develops a fifty percent chance of …
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Poly (Adp) Ribose Polymerase Inhibitors For The Treatment of Malignant Peripheral Nerve Sheath Tumor
<p>Malignant peripheral nerve sheath tumor (MPNST) is a rare subtype of soft tissue sarcoma. Surgical excision has remained the standard of care for this highly aggressive malignancy for over a decade. Conventional chemotherapy and radiotherapy have shown limited efficacy in MPNST; therefore, it is …
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Kinetic Study of the Sheath Region Near the First Wall for Tokamak Fusion Reactors
Made available in DSpace on 2017-07-06T18:56:15Z (GMT). No. of bitstreams: 3 Schwager_Lou_Ann_MS.pdf: 30433195 bytes, checksum: 4e568494b260d6c2295e0c3c8e5c9c60 (MD5) Schwager_Lou_Ann_MS_ABS.pdf: 341201 bytes, checksum: a7aa856d8326e24ad6c22a381e5dafd2 (MD5) license.txt: 4813 bytes, checksum: …
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Identification of transcriptional mechanisms downstream of nf1 gene defeciency in malignant peripheral nerve sheath tumors
<p>Malignant peripheral nerve sheath tumor (MPNST) is a type of soft tissue sarcoma that occurs in carriers of mutations in the neurofibromatosis type I gene (Nf1) as well as sporadically. Plexiform neurofibromas in NF1 patients have a significant risk of developing into MPNSTs leading to increased …
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Novel Small Molecule Induces Apoptosis in Malignant Peripheral Nerve Sheath Tumors of Neurofibromatosis Type I
… can transform into malignant peripheral nerve sheath tumors (MPNSTs), a main cause of mortality. Currently, surgery is the primary course of treatment for MPNST, but with the limitation that these tumors are highly invasive. Radiotherapy is another treatment option, but is undesirable because …
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Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies
… due to the formation of radio-frequency (RF) sheaths is one of the root causes of this problem. Since the RF-enhanced sheaths have many undesirable effects, such as impurity production and hot spot generation, a predictive numerical tool is required to quantitatively evaluate these effects …
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Characterizing the Behavior of Smart Oil Well Cement for Enhancing the Monitoring of Cement Sheath Integrity
Oil well cementing is one of the most important and yet complex steps of a drilling project. One of the challenges in maintaining the well integrity is in monitoring the performance of oil well cement (OWC) used in the construction of the well. Recent oil well failures have clearly identified the …
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Multiscale numerical simulations of the magnetized plasma sheath with massively parallel electrostatic particle-in-cell code
… of plasma near to the surface, called the plasma sheath, where the plasma ions accelerate from subsonic to supersonic conditions, is typically either not handled or treated with ad-hoc approximations. The characteristic scale of the near-surface plasma (sheath and presheath) is comparable to the …
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Polarization Controlled Coherent Anti-Stokes Raman Scattering Microscopy for Determination of Structural Order of the Myelin Sheath
… a strong label-free signal in lipid. The myelin sheath surrounding nerves is up to 80% lipid, and therefore is an ideal candidate for CARS imaging. The long lipid chains forming the myelin wraps have a directional preference when the myelin is healthy, with CH2 bonds aligned parallel to the axis …
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