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  • Life Sciences (General)  (8)
  • Engineering (General)  (5)
  • NAF  (5)
  • 2000-2004  (18)
  • 1
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    Long-term elasticity in the continental lithosphere; modelling the Aden Ridge propagation and the Anatolian extrusion process (2003)
    In:  Geophysical Journal International, Taipei, Am. Inst. Min. Metal. Petr. Eng., vol. 153, no. 1, pp. 111-132, pp. 2235, (ISSN 0343-5164)
    Details
    Publication Date: 2003
    Keywords: Rheology ; Plate tectonics ; rifting ; NAF ; Fault zone ; GJI ; FLORENZO
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Morphology, displacement, and slip rates along the North Anatolian Fault, Turkey (2002)
    In:  J. Geophys. Res., Taipei, Am. Inst. Min. Metal. Petr. Eng., vol. 107, no. B10, pp. ETG 9-1 to ETG 9-33, pp. 2235, (ISSN 0343-5164)
    Details
    Publication Date: 2002
    Keywords: Geol. aspects ; Structural geology ; Seismicity ; Fault zone ; NAF ; 8107 ; Tectonophysics: ; Continental ; neotectonics ; 8158 ; Tectonophysics: ; Plate ; motions--present ; and ; recent ; (3040) ; 7230 ; Seismology: ; Seismicity ; and ; seismotectonics ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Global Positioning System constraints on plate kinematics and dynamics in the eastern Mediterranean and Caucasus (2000)
    In:  J. Geophys. Res., New York, 1-2, vol. 105, no. B3, pp. 5695-5719, pp. 1610, (ISSN: 1340-4202)
    Details
    Publication Date: 2000
    Keywords: Global Positioning System ; Turkey ; NAF ; Plate tectonics ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Fault plane solution, focal mechanism ; JGR ; 1206 ; Geodesy ; and ; gravity ; Crustal ; movements--interplate ; (8155) ; 1208 ; Crustal ; movements--intraplate ; (8110) ; 1243 ; Space ; geodetic ; surveys ; 8110 ; Tectonophysics ; Continental ; tectonics--general ; (0905) ; Toksoez ; Toksoz ; Sanli
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Asymmetric slip partitioning in the Sea of Marmara pull-apart: a clue to propagation processes of the North Anatolian Fault? (2002)
    In:  TN, Amsterdam, Elsevier Scientific Publishing Company, vol. 14, no. 2, pp. 80-86, pp. Q06009
    Details
    Publication Date: 2002
    Keywords: Structural geology ; Fault zone ; NAF ; Turkey ; Geol. aspects ; Global Positioning System
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    The mechanical interaction between the propagating North Anatolian Fault and the back-arc extension in the Aegean (2004)
    In:  Earth planet. Sci. Lett., Tokyo, Terra Scientific Publishing Company, vol. 224, no. 3-4, pp. 347-362, pp. B08404, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 2004
    Keywords: Structural geology ; Fault zone ; NAF ; Plate tectonics ; Marmara ; EPSL ; FROTH
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Contrast and harmonic imaging improves accuracy and efficiency of novice readers for dobutamine stress echocardiography (2002)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: BACKGROUND: Newer contrast agents as well as tissue harmonic imaging enhance left ventricular (LV) endocardial border delineation, and therefore, improve LV wall-motion analysis. Interpretation of dobutamine stress echocardiography is observer-dependent and requires experience. This study was performed to evaluate whether these new imaging modalities would improve endocardial visualization and enhance accuracy and efficiency of the inexperienced reader interpreting dobutamine stress echocardiography. METHODS AND RESULTS: Twenty-nine consecutive patients with known or suspected coronary artery disease underwent dobutamine stress echocardiography. Both fundamental (2.5 MHZ) and harmonic (1.7 and 3.5 MHZ) mode images were obtained in four standard views at rest and at peak stress during a standard dobutamine infusion stress protocol. Following the noncontrast images, Optison was administered intravenously in bolus (0.5-3.0 ml), and fundamental and harmonic images were obtained. The dobutamine echocardiography studies were reviewed by one experienced and one inexperienced echocardiographer. LV segments were graded for image quality and function. Time for interpretation also was recorded. Contrast with harmonic imaging improved the diagnostic concordance of the novice reader to the expert reader by 7.1%, 7.5%, and 12.6% (P 〈 0.001) as compared with harmonic imaging, fundamental imaging, and fundamental imaging with contrast, respectively. For the novice reader, reading time was reduced by 47%, 55%, and 58% (P 〈 0.005) as compared with the time needed for fundamental, fundamental contrast, and harmonic modes, respectively. With harmonic imaging, the image quality score was 4.6% higher (P 〈 0.001) than for fundamental imaging. Image quality scores were not significantly different for noncontrast and contrast images. CONCLUSION: Harmonic imaging with contrast significantly improves the accuracy and efficiency of the novice dobutamine stress echocardiography reader. The use of harmonic imaging reduces the frequency of nondiagnostic wall segments.
    Keywords: Life Sciences (General)
    Type: Echocardiography (Mount Kisco, N.Y.) (ISSN 0742-2822); Volume 19; 6; 483-8
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A Continuous Adiabatic Demagnetization Refrigerator for Far-IR/Sub-mm Astronomy (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We report on recent progress in the development of a continuous adiabatic demagnetization refrigerator (CADR). Continuous operation avoids the constraints of long hold times and short recycle times that lead to the generally large mass of single-shot ADRs, allowing us to achieve an order of magnitude larger cooling power per unit mass. Our current design goal is 10 microW of cooling at 50 mK using a 6-10 K heat sink. The estimated mass is less than 10 kg, including magnetic shielding of each stage. The relatively high heat rejection capability allows it to operate with a mechanical cryocooler as part of a cryogen-free, low temperature cooling system. This has the advantages of long mission life and reduced complexity and cost. We have assembled a three-stage CADR and have demonstrated continuous cooling using a superfluid helium bath as the heat sink. The temperature stability is 8 microK rms or better over the entire cycle, and the cooling power is 2.5 microW at 60 mK rising to 10 microW at 100 mK.
    Keywords: Engineering (General)
    Type: New Concepts for Far-Infrared and Submillimeter Space Astronomy; 454-460; NASA/CP-2003-212233
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Dynamic Light-Scattering Probe Used for the Very Early Detection of Cataracts and to Measure Response to Therapy (or Treatment) (2002)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: Half of all blindness worldwide is due to cataracts, and 34 million Americans over the age of 65 have cataracts. This figure is expected to rise to 70 million by the year 2030. Currently, no medical treatment is available to prevent or halt the progression of a cataract; nor is there any way to reverse a cataract once it has been detected by conventional methods. The only known treatment is surgical removal of the lens. It is estimated that over $5 billion will be spent this year for the treatment of cataract patients in the United States alone. According to Carl Kupfer, M.D., former Director of the National Eye Institute at the National Institutes of Health, "A delay in cataract formation of about 10 years would reduce the prevalence of visually disabling cataracts by about 45 percent." However, this vision remains a dream because of the lack of objective methods that can be used to detect cataracts very early and, hence, can be used for screening potential anticataract drugs. This is about to change. The National Eye Institute and NASA entered into a formal interagency agreement in late 1996 to develop and test a dynamic light-scattering (DLS) device to detect the earliest changes due to cataract formation. The new DLS probe developed by Dr. Ansari at the NASA Glenn Research Center is several orders of magnitude more sensitive than conventional clinical systems. This ultrahigh sensitivity enables the probe to detect the onset of a cataract before it has any effect on vision and allows researchers to test the effectiveness of anticataract drugs in reversing cataracts. This device (see the following illustration) was originally designed to study transport phenomena in microgravity fluid physics experiments onboard the space shuttle orbiters and space station. It will be very useful in testing anticataract drugs to halt or reverse the progression of cataracts during longitudinal clinical trials.
    Keywords: Life Sciences (General)
    Type: Research and Technology 2001; NASA/TM-2002-211333
    Format: application/pdf
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  • 9
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    A Compact, High-Performance Continuous Magnetic Refrigerator (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We present test results of the first adiabatic demagnetization refrigerator (ADR) that can produce continuous cooling at sub-kelvin temperatures. This system uses multiple stages that operate in sequence to cascade heat from a continuous stage up to a heat sink. Continuous operation aids the usual constraints of long hold times and short recycle times that lead to the generally large mass of single-shot ADRs, and allows us to achieve much higher cooling power per unit mass. Our design goal is 10 microW of cooling at 50 mK while rejecting heat to a 6-10 K heat sink. The total cold mass is estimated to be less than 10 kg, including magnetic shielding of each stage. These parameters envelop the requirements for currently planned astronomy missions. The relatively high heat rejection capability allows it to operate with a mechanical cryocooler as part of a cryogen-free, low temperature cooling system. This has the advantages of long, mission life and reduced complexity and cost. At present, we have assembled a three-stage ADR that operates with a superfluid helium bath. Additional work is underway to develop magnetocaloric materials that can extend its heat rejection capability up to 10 K. This paper discusses the design and operation of the ADR, as well as interface requirements for cryocooler-based operation.
    Keywords: Engineering (General)
    Type: Space Cryogenics Workshop; Jul 12, 2001 - Jul 13, 2001; Milwaukee, WI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Continuous Magnetic Refrigerators for Cooling in the 0.05 to 10 K Range (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Low temperature refrigeration is an increasingly vital technology for NASA's Space Science program since most detectors being developed for x-ray, IR and sub-millimeter missions must be cooled to below 100 mK in order to meet the requirements for energy and spatial resolution. For space applications, magnetic refrigeration has an inherent advantage over alternative techniques because it does not depend on gravity. Adiabatic demagnetization refrigerators, or ADRs, are relatively simple, solid state devices. The basic elements are a magnetocaloric refrigerant (usually an encapsulated paramagnetic salt) located in the bore of a superconducting magnet, and a heat switch linking the salt to a heat sink. The alignment of magnetic spins with the magnetic field causes the refrigerant to warm as the magnetic field increases and cool as the field decreases. Thus the simple process of magnetizing the refrigerant to high field with the heat switch closed, then demagnetizing it with the heat switch open allows one to obtain temperatures well below 100 mK using a heat sink as warm as 4.2 K. The refrigerant can maintain a low temperature for a length of time depending on the applied and parasitic heat loads, its mass, and the initial magnetic field strength. Typically ADRs are designed for 12-24 hours of hold time, after which they must be warmed up and recycled.
    Keywords: Engineering (General)
    Format: text
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