45 research outputs found
Strain and Surface Effects on the Magnetism of Epitaxial Nickel Cobaltate Thin Films
No full textResearch into the behavior of NiCo2O4 (NCO) has accelerated in the last two decades, especially due to its promising applications in catalysis and in supercapacitive energy storage. The transport properties of NCO have been shown to be tied to its magnetic behavior, suggesting research into the magnetism of the material, especially in thin film form, may help inform other aspects of its properties. While NCO is known to exhibit perpendicular magnetic anisotropy (PMA), no work has analyzed the size of the effect, nor the mechanism of the anisotropy.This dissertation presents the observations of strong magnetic anisotropy for epitaxial films grown via pulsed laser deposition onto MgAl2O4 substrates. By fabricating a variety of sample geometries, the size of the anisotropy is determined and is close to that of similar oxides & similar thin-film materials. Using both phenomenological and microscopic studies, we then demonstrate how the modest strain induces the tetragonal distortion leading to the PMA. The second part of the dissertation presents the observation of surface magnetization which is not observed in conventional SQUID magnetometry. Through use of surface-sensitive x-ray magnetic circular dichroism (XMCD) measurements, the surface magnetization is observed to be confined to approximately the top one nanometer of the film, with magnetic transition temperature well below that of the bulk film. Evidence for the reduced magnetism coming from vacancies within the spinel structure are also presented
Curriculum organization of the Sargent consolidated high school
No full textApril 20, 1927.Includes bibliographical references (pages 68-70)
Teaching Theology as a Christian Spiritual Practice: The Example of Stanley J. Grenz
No full textDegree awarded: Ph.D. Spirituality. The Catholic University of AmericaThis dissertation explores the recent work on spiritual practices in the academic discipline of Christian spirituality, gathering together the strengths of various conceptions of practice from the literature and developing a rigorous definition of a Christian spiritual practice: Christian spiritual practices are things God enables Christian people to do together over time to address fundamental human needs in light of the gospel of Jesus Christ, activities that together form a way of life that pleases God and through which God teaches and transforms persons into the image of the Son.Practices may be Christian or may not be, depending upon whether practitioners ground their practices in the Christian tradition, reflect critically upon them in light of that tradition, and recognize God's agency within them. Thus, teaching theology may or may not be performed as a Christian spiritual practice. This study examines the activities of reading, writing, and teaching—all broadly defined—as the three necessary and sufficient practices of theological education, and determines that each of them may be done in an engaged or a disengaged fashion, an “academic” or a “spiritual” orientation, or some mixture of the two. Engaged theological educators tend to exhibit the dispositions of humble hospitality, reflective and attentive contemplation, and prayerful conversation in their reading, writing, and teaching.After carefully correlating the aspects of the definition of Christian spiritual practices with the composite practice of theological education, this thesis contends that teaching theology can meet the definition of a Christian spiritual practice. The work of Stanley J. Grenz, a prominent evangelical theologian, establishes that he employed reading, writing, and teaching while exhibiting the dispositions enumerated above, marking him as an engaged theological educator. His pursuit of teaching theology as a Christian spiritual practice can serve as a model for others to emulate, possibly contributing to a reunion of spirituality and theological pedagogy in the lives of individual teachers, their students and colleagues, and the corporate people of God.Made available in DSpace on 2011-02-24T20:48:18Z (GMT). No. of bitstreams: 1
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A Note on Line-Baer subspace Partitions of PG(3, 4)
No full textWe consider the partitioning of PG(3, 4) into two types of objects, lines and Baer sub-3-spaces. Any such mixed partition gives rise to a spread of PG(7, 2) (and hence a projective plane of order 16) via a construction tech-nique given in [6]. The author has used the software package Magma to de-termine all such mixed partitions up to equivalence. It turns out that all of the translation planes of order 16 arise from one of the mixed partitions. Mathematics Subject Classification (2000): 51E2
Religious Correlates of Hogan's Survey of Ethical Attitudes
No full text The scores of 102 undergraduates on Hogan's Survey of Ethical Attitudes were correlated with an author-devised measure of religious identification, religious upbringing, political attitudes, and socioeconomic background. Personality traits as assessed by the 16 PF were also measured. A factor analysis of questionnaire and personality variables produced factor scores which were then used in a multiple regression to predict survey scores. The best predictor of a moral positivist stance was a factor of current church affiliation combined with a conscientious personality. The second strong factor predicting moral positivism was a factor including a conservative political attitude combined with a well-to-do family background. Weaker predictors of moral positivism were an emotionally stable personality and an upbringing with less emphasis on religion. </jats:p
Perpendicular magnetic anisotropy in conducting NiCo\u3csub\u3e2\u3c/sub\u3eO\u3csub\u3e4\u3c/sub\u3e films from spin-lattice coupling
No full textHigh perpendicular magnetic anisotropy (PMA), a property needed for nanoscale spintronic applications, is rare in oxide conductors. We report the observation of a PMA up to 0.23 MJ/m3 in modestly strained (–0.3%) epitaxial NiCo2O4 films which are room-temperature ferrimagnetic conductors. Spin-lattice coupling manifested as magnetoelastic effect was found as the origin of the PMA. The in-plane x2-y2 states of Co on tetrahedral sites play crucial role in the magnetic anisotropy and spin-lattice coupling with an energy scale of 1 meV/f.u. The elucidation of the microscopic origin paves a way for engineering oxide conductors for PMA using metal/oxygen hybridizations
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No full textPerspective on Epitaxial NiCo2O4 Film as an Emergent Spintronic Material: Magnetism and Transport Properties
No full textThe ferrimagnetic inverse spinel NiCo2O4 has attracted extensive research
interests for its versatile electrochemical properties, robust magnetic order,
high conductivity, and fast spin dynamics, as well as its highly tunable nature
due to the closely coupled charge, spin, orbital, lattice, and defect effects.
Single-crystalline epitaxial thin films of NiCo2O4 present a model system for
elucidating the intrinsic physical properties and strong tunability, which are
not viable in bulk single crystals. In this perspective, we discuss the recent
advances in epitaxial NiCo2O4 thin films, focusing on understanding its unusual
magnetic and transport properties in light of crystal structure and electronic
structure. The perpendicular magnetic anisotropy in compressively strained
NiCo2O4 films is explained by considering the strong spin-lattice coupling,
particularly on Co ions. The prominent effect of growth conditions reveals the
complex interplay between the crystal structure, cation stoichiometry, valence
state, and site occupancy. NiCo2O4 thin films also exhibit various
magnetotransport anomalies, including linear magnetoresistance and sign change
in anomalous Hall effect, which illustrate the competing effects of band
intrinsic Berry phase and impurity scattering. The fundamental understanding of
these phenomena will facilitate the functional design of NiCo2O4 thin films for
nanoscale spintronic applications
Horace Kephart, pioneer interpreter of the southern highlands
No full textThis article is a memorial to Horace Kephart (1862-1931), a noted naturalist, woodsman, journalist, and author. In 1904, he left his work as a librarian in St. Louis and permanently moved to western North Carolina. His popular book, “Camping and Woodcraft” was first published 1906; the 1916/1917 edition is considered a standard manual for campers after almost a century of use. Living and working in a cabin on Hazel Creek in Swain County, Kephart began to document life in the Great Smoky Mountains, producing “Our Southern Highlanders” in 1913. Throughout his life, Kephart wrote many articles supporting the Great Smoky Mountains National Park.HORACE Ml. .. I II -% I! n
PRE'I-ili Of Till: MOliTW.RX HIGHLANDS
Editor of The Times:
The tragic death of Horace Kephart has
country, as well as to those of the South- I
ern Highlands among whom he has lived j
so long, and by whom he wae so in '
loved. No adopted son of any land
became a truer son than Horace Kephart 1
this remarkable man during the past two
summers. It required little observation to
note the high esteem in which he was
held by all aline, and the frequency with
which his advice, was sought. He was the
sage. He was the understanding friend. I
He was the yvise counsellor of all.
But this spirit of friendliness has gone j
farther than the locality in which he I
chose to spend his life, Horace Kephar' '
has been the kindly introducer and in
terpreter of the Soutnern II g h d
all the worid. More and more will hi
p'ioneer in th,
"Great Smokies" be appreciated. Until |
recently, little was known al these i
mountains of the South. Mr. Kephart,!
doubtless, the best informed man on "-- !
Southern mountains, tells us that v.
he first went- to the "Great Smokies'
could not find so much as a magazine |
article that had been written about- them
He published his book in 1913. Four years
tic p I' < c hi:
rnuc ... .1 i i ., , < i • ays
from Horace Kephart who has introduced I
the Great I
hundreds
