3,920 research outputs found
The Trojan Cow: H. Derks: De Koe van Troje. De mythe van de Griekse oudheid. Pp. xii + 330, 32 ills. Hilversum: Verloren, 1995. Paper, Hfl. 57.50. ISBN: 90-6550-519-9.
Greek Armour: E. Jarva: Archaiologia on Archaic Greek Body Armour. (Studia Archaeologica Septentrionalia 3.) Pp. 176; 61 ills. Rovaniemi: Pohjois-Suomen Historiallinen Yhdistys: Societas Historica Finlandiae Septentrionalis, 1995. ISBN: 952-9888-03-1 (ISSN: 0786-5066).
The Seleucid Army: N. Sekunda: Seleucid and Ptolemaic Reformed Armies 168β145 BC. Vol. 1: The Seleucid Army under Antiochus IV Epiphanes. Pp. 80; ills. Stockport: Montvert, 1994. Paper. ISBN: 1-874101-02-7. Vol. 2: The Ptolemaic Army under Ptolemy VI Philometor.Pp. 84; ills. Stockport: Montvert, 1995. Paper. ISBN: 1-874101-03-5.
Changes and factors in mental health functioning of adolescents in therapy : a thesis presented in partial fulfilment of the requirements for the degree of Master of Arts in Psychology at Massey University (Palmerston North), New Zealand
Appendix D is not availableTo explore factors that might contribute to changes in mental health functioning in adolescents with mental health problems seen at a Child, Adolescent, and Family Mental Health Service (CAFMHS), the present study examined changes in scores on the Clinical Outcomes of Routine Evaluation (CORE) and the Health of the Nation Outcome Scales for Children and Adolescents (HoNOSCA) over a 3 month period. Ten female and 5 male adolescents completed the CORE and 7 of their respective therapists assessed their mental health on HoNOSCA, before and after 3 months of intervention. Life events and factors within therapy during the period of the study were assessed through interviews with clients and their respective therapists. Analysis of the data indicated that overall the mental health of the participants did improve. No significant correlations between clients' and clinicians' assessment of therapeutic factors were found. The hypotheses that focused on factors that might have contributed to the changes were not supported, possibly due to the small number of participants. Limitations of the study and future directions were discussed
Graphene-WS heterostructures for tunable spin injection and spin transport
We report the first measurements of spin injection in to graphene through a
20 nm thick tungsten disulphide (WS) layer, along with a modified spin
relaxation time ({\tau}s) in graphene in the WS environment, via spin-valve
and Hanle spin-precession measurements, respectively. First, during the
spin-injection into graphene through a WS-graphene interface, we can tune
the interface resistance at different current bias and modify the spin
injection efficiency, in a correlation with the conductivity-mismatch theory.
Temperature assisted tunneling is identified as a dominant mechanism for the
charge transport across the interface. Second, we measure the spin transport in
graphene, underneath the WS crystal and observe a significant reduction in
the {\tau}s down to 17 ps in graphene in the WS covered region, compared to
that in its pristine state. The reduced {\tau}s indicates the WS-proximity
induced additional dephasing of the spins in graphene.Comment: 7 Pages, 6 figure
Electrical spin injection, transport, and detection in graphene-hexagonal boron nitride van der Waals heterostructures: progress and perspectives
The current research in graphene spintronics strives for achieving a long
spin lifetime, and efficient spin injection and detection in graphene. In this
article, we review how hexagonal boron nitride (hBN) has evolved as a crucial
substrate, as an encapsulation layer, and as a tunnel barrier for manipulation
and control of spin lifetimes and spin injection/detection polarizations in
graphene spin valve devices. First, we give an overview of the challenges due
to conventional SiO substrate for spin transport in graphene followed by
the progress made in hBN based graphene heterostructures. Then we discuss in
detail the shortcomings and developments in using conventional oxide tunnel
barriers for spin injection into graphene followed by introducing the recent
advancements in using the crystalline single/bi/tri-layer hBN tunnel barriers
for an improved spin injection and detection which also can facilitate
two-terminal spin valve and Hanle measurements, at room temperature, and are of
technological importance. A special case of bias induced spin polarization of
contacts with exfoliated and chemical vapour deposition (CVD) grown hBN tunnel
barriers is also discussed. Further, we give our perspectives on utilizing
graphene-hBN heterostructures for future developments in graphene spintronics.Comment: Review, Author submitted manuscript - draft; 25 pages, 8 figure
Spin current induced magnetization oscillations in a paramagnetic disc
When electron spins are injected uniformly into a paramagnetic disc, they can
precess along the demagnetizing field induced by the resulting magnetic moment.
Normally this precession damps out by virtue of the spin relaxation which is
present in paramagnetic materials. We propose a new mechanism to excite a
steady-state form of this dynamics by injecting a constant spin current into
this paramagnetic disc. We show that the rotating magnetic field generated by
the eddy currents provide a torque which makes this possible. Unlike the
ferromagnetic equivalent, the spin-torque-oscillator, the oscillation frequency
is fixed and determined by the dimensions and intrinsic parameters of the
paramagnet. The system possesses an intrinsic threshold for spin injection
which needs to be overcome before steady-state precession is possible. The
additional application of a magnetic field lowers this threshold. We discuss
the feasibility of this effect in modern materials. Transient analysis using
pump-probe techniques should give insight in the physical processes which
accompany this effect
Verification of the Thomson-Onsager reciprocity relation for spin caloritronics
We investigate the Thomson-Onsager relation between the spin-dependent
Seebeck and spin-dependent Peltier effect. To maintain identical device and
measurement conditions we measure both effects in a single
NiFe/Cu/NiFe nanopillar spin valve device subjected
to either an electrical or a thermal bias. In the low bias regime, we observe
similar spin signals as well as background responses, as required by the
Onsager reciprocity relation. However, at large biases, deviation from
reciprocity occurs due to dominant nonlinear contribution of the temperature
dependent transport coefficients. By systematic modeling of these nonlinear
thermoelectric effects and measuring higher order thermoelectric responses for
different applied biases, we identify the transition between the two regimes as
the point at which Joule heating start to dominate over Peltier heating. Our
results signify the importance of local equilibrium for the validity of this
phenomenological reciprocity relation.Comment: 5 pages, 5 figure
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