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Showing 1 to 20 of 181 for “"variable temperature"”.

  1. Variable temperature high-frequency response of heterostructure transistors

    Laskar, JoyUniversity of Illinois at Urbana-Champaign1992

    The development of high performance heterostructure transistors is essential for emerging opto-electronic integrated circuits (OEICs) and monolithic microwave integrated circuits (MMICs). Applications for OEICs and MMICs include the rapidly growing telecommunications and personal communications …

    uiuc Repository record

  2. Variable-temperature photoluminescence emission instrumentation and measurements on low yield metals

    Armstrong, HelenDurham University2010

    … YBCO were made for λex = 488 nm as a function of temperature (72 K < T < 300 K), time (t < 12 hours), excitation power (P < 120 mW) and position on the sample using a high sensitivity instrument which was designed, commissioned and calibrated for this study. We present the first measurements of …

    durham Repository record

  3. Variable Temperature, Intensity Calibrated, Complete Submillimeter Spectra and Analysis for Astrophysical Assignment

    Fortman, Sarah M.The Ohio State University2013

    … laboratory spectra taken at many different temperatures. By analyzing these spectra together, it is possible to derive the lower state energy and transition strength for every spectral line without quantum mechanical assignment. These derived parameters can then be used to predict a complete …

    ohiolink Repository record

  4. Variable Temperature Scanning Tunneling Microscopy Study of a High Temperature Superconductor BSCCO

    Vershinin, MichaelUniversity of Illinois at Urbana-Champaign2015

    Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs

    uiuc Repository record

  5. Variable Temperature Scanning Tunneling Microscopy Study of a High Temperature Superconductor Bi2Sr2CaCu2O8+d

    Vershinin, Michael2012

    … superconductor Bi2Sr2CaCu2O8+d as a function of temperature. We have demonstrated for the first time that atomicallyresolved spectroscopic studies at elevated temperatures are possible. We have used this new experimental capability to map out electronic states as a function of energy and position …

    uiuc Repository record

  6. A variable temperature scanning tunneling microscopy study of organizing C60 molecules on nanostructured gold surface

    Zhang, XinUniversity of Birmingham2010

    … are studied under various conditions using variable temperature UHV STM. At room temperature, the C\(_{60}\)/Au interface exhibits rich features observed in the STM images, for instance the lifting of the reconstruction and the appearance of dim molecules in the close-packed C\(_{60}\) …

    birmingham Repository record

  7. Study of the dilute solution properties of various homo- and block co-polymers by variable temperature size exclusion chromatography

    Das, Pradip KumarVirginia Polytechnic Institute and State University1984

    The Variable Temperature Size Exclusion Chromatography (VTSEC) was used to study the dilute solution properties of various homo- and block copolymers as well as polymer blends, focus being primarily on the configuration-dependent properties such as average chain dimensions and hydrodynamic behavior …

    vt Repository record

  8. Automated Variable Temperature Hall Effect Measurements and Analysis of N-Type Gallium-Arsenide, Indium-Phosphide and Their Lattice Matched Alloy Semiconductors (Hall Effect)

    Lepkowski, Thomas RichardUniversity of Illinois at Urbana-Champaign2014

    A thorough background to the theoretical analysis of Hall effect carrier concentrations and mobilities in n-type GaAs, InP, and their related direct gap semiconductor alloys is presented along with a thorough treatment of those factors affecting the measurement. The design and construction of the …

    uiuc Repository record

  9. Organo-iron compounds on clays and pillared clays.

    Hamer, Julian C. E.Sheffield Hallam University (United Kingdom).1998

    … intercalated into the montmorillonite Westone-L. Variable temperature Mossbauer spectroscopy indicated that the molecule had a similar Debye temperature in each environment (144 +/- 5 K and 140 +/- 5 K respectively). The intercalated Mossbauer spectra revealed a Karayagin effect above 80 K. The …

    sheffield-hallam Repository record

  10. Investigation of the Interface Recombination Velocity of Native Oxide/iii-V Semiconductor Interfaces

    Curtis, Anthony PaulUniversity of Illinois at Urbana-Champaign2015

    … activation energy of the IRV was extracted from variable temperature TRPL measurements performed on selected samples. The activation energies of the interface recombination velocities agreed with previously established results on unoxidized material interfaces.

    uiuc Repository record

  11. Development of a Ft-Nmr Data Acquisition System and Nmr Studies of Homogeneous Catalytic Processes at High Pressure (Rhodium)

    Hoffman, Gregory AlanUniversity of Illinois at Urbana-Champaign2014

    … system and the development of a high pressure, variable temperature. FT-NMR technique for the study of homogeneous catalytic systems at high pressures.

    uiuc Repository record

  12. Synthesis and Properties of New Oxychalcogenide Materials

    Free, David GeorgeDurham University2011

    … is also discussed. Chapter 3 discusses the variable temperature structural and magnetic properties of La2O2Mn2OSe2 and Pr2O2Mn2OSe2, as well as those of the newly prepared material Ce2O2Mn2OSe2. These materials are observed to undergo a phase transition on cooling revealed by a change in the …

    durham Repository record

  13. Nmr Studies of Compressed Supercritical Water and Proton Exchange in Compressed Liquid Water

    Lamb, Walter JamesUniversity of Illinois at Urbana-Champaign2014

    … magnets. The second is the design of a variable temperature (-50 to 1000(DEGREES)C) NMR probe. The relaxation times of Na('+) in NaCl(l) are also reported in this appendix.

    uiuc Repository record

  14. The Solid State Ferric Spin-Crossover Transition: Spectroscopic, Magnetic, and Structural Investigations (Moessbauer, Epr, High, Low)

    Timken, Mark DarrellUniversity of Illinois at Urbana-Champaign2014

    … have been prepared and characterized by using variable temperature magnetic susceptibility, ('57)Fe Mossbauer spectroscopy, EPR spectroscopy, and single-crystal X-ray diffractometry. These solids were prepared and examined in order to determine the molecular and solid state features that may …

    uiuc Repository record

  15. Cation and Anion Transport in a Dicationic Imidazolium-Based Plastic Crystal Ion Conductor

    Kidd, Bryce EdwinVirginia Tech2013

    … by changes in cation and anion Ea. Moreover, variable temperature 2H SSNMR lineshapes further support a change in local molecular environment upon slow cooling in B0. Additionally, we quantify the percentage of mobile anions as a function of temperature from variable temperature 19F SSNMR, …

    vt Repository record

  16. NMR Study of n-Propyllithium Aggregates

    Davis, James W.University of North Texas2002

    A variable temperature 1H, 13C, and 6Li NMR study of n-propyl-6Li-lithium showed five different aggregates, similar to that in the literature as (RLi)n, n= 6, 8, 9, 9, 9. There were also a number of additional new species, identified as lithium hydride containing aggregates. Unexpectedly, a series …

    unt Repository record

  17. Investigations of the effects of iron, manganese, and nickel on the properties of sulfated zirconia catalysts.

    Sikabwe, Chandja Emmanuel.1997

    … for catalysts with differing compositions. Temperature programmed desorption (TPD) measurements of surface adsorbed species were used to characterize catalyst acidities. Diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) and variable temperature diffuse reflectance Fourier …

    oklahoma-thes Repository record

  18. ΚΒΑΝΤΟΧΗΜΙΚΗ ΚΑΙ ΠΕΙΡΑΜΑΤΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΔΟΜΗΣ ΚΑΙ ΤΩΝ ΦΑΙΝΟΜΕΝΩΝ ΥΠΕΡΑΝΤΑΛΛΑΓΗΣΝΕΩΝ D9 ΜΑΓΝΗΤΙΚΩΝ ΣΥΣΤΗΜΑΤΩΝ ΤΟΥ ΦΘΑΛΙΚΟΥ ΚΑΙ ΙΣΟΦΘΑΛΙΚΟΥ ΟΞΕΟΣ

    Shakhatreh, SalehAristotle University Of Thessaloniki (AUTH)1987

    … SPIN EXCHANGE PHENOMENA HAVE BEEN VERIFIED BY VARIABLE TEMPERATURE MAGNETIC SUSCEPTIBILITY DATA, AND EHMA CALCULATION. FINALLY, THE ANTINEOPLASTIC ACTIVITY OF THE TWO DIEN COMPLEXES HAS BEEN EXAMINED, AS WELL.

    greece Repository record

  19. Charge transport in printed silicon nanoparticle networks

    Magunje, Batsirai,Department of Physics2013

    … networks have been comprehensively studied using variable temperature IV characteristics and Hall effect measurements, supported by microscopy studies. The conductivity can be described as hopping percolation in which activated charge transport is limited by band bending at the interface between …

    cape-town Repository record

  20. $^{17}$O Solid-State NMR Spectroscopy of Functional Oxides for Energy Conversion

    Halat, David MichaelUniversity of Cambridge2018

    … cathodes, and (2) further uses of multinuclear variable-temperature NMR spectroscopy, with emphasis on $^{17}$O NMR results, to elucidate mechanistic details of oxide-ion motion and sublattice exchange in a novel family of promising SOFC electrolyte materials based on $\delta$-Bi$_{2}$O$_{3}$. …

    cambridge Repository record

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