1,247 research outputs found
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
Separating spin and charge transport in single wall carbon nanotubes
We demonstrate spin injection and detection in single wall carbon nanotubes
using a 4-terminal, non-local geometry. This measurement geometry completely
separates the charge and spin circuits. Hence all spurious magnetoresistance
effects are eliminated and the measured signal is due to spin accumulation
only. Combining our results with a theoretical model, we deduce a spin
polarization at the contacts of approximately 25 %. We show that the
magnetoresistance changes measured in the conventional two-terminal geometry
are dominated by effects not related to spin accumulation.Comment: Number of pages: 11 Number of figures:
The Potential of In-train Crowdsourcing
Nowadays railway operators are improving their services by offering IT-services within their trains. This paper reports on a design study we performed at Dutch Railways (Nederlandse Spoorwegen, NS) in order to research whether or not NS can crowdsource activities utilizing the novel in-train IT infrastructure it is currently rolling out, and provide their passengers a better journey experience at the same time. We specifically focused the potential of future services an the users intention to use the service over time. The study followed a design cycle, in which we created artefacts, and analysed adoption of these artefacts utilizing an in-train survey. Despite the limited scope of the study we can conclude that there is potential for in-train crowdsourcing. Passengers do show interest in the applications we designed, and the more general concept of in-train interaction. Adoption is more likely to occur when serious applications are used, as opposed to entertainment applications
Spin-Dependent Electron Transmission Model for Chiral Molecules in Mesoscopic Devices
Various device-based experiments have indicated that electron transfer in
certain chiral molecules may be spin-dependent, a phenomenon known as the
Chiral Induced Spin Selectivity (CISS) effect. However, due to the complexity
of these devices and a lack of theoretical understanding, it is not always
clear to what extent the chiral character of the molecules actually contributes
to the magnetic-field-dependent signals in these experiments. To address this
issue, we report here an electron transmission model that evaluates the role of
the CISS effect in two-terminal and multi-terminal linear-regime electron
transport experiments. Our model reveals that for the CISS effect, the
chirality-dependent spin transmission is accompanied by a spin-flip electron
reflection process. Furthermore, we show that more than two terminals are
required in order to probe the CISS effect in the linear regime. In addition,
we propose two types of multi-terminal nonlocal transport measurements that can
distinguish the CISS effect from other magnetic-field-dependent signals. Our
model provides an effective tool to review and design CISS-related transport
experiments, and to enlighten the mechanism of the CISS effect itself
The Magneto-coulomb effect in spin valve devices
We discuss the influence of the magneto-coulomb effect (MCE) on the
magnetoconductance of spin valve devices. We show that MCE can induce
magnetoconductances of several per cents or more, dependent on the strength of
the coulomb blockade. Furthermore, the MCE-induced magnetoconductance changes
sign as a function of gate voltage. We emphasize the importance of separating
conductance changes induced by MCE from those due to spin accumulation in spin
valve devices.Comment: This paper includes 3 figure
Cross-Species Alignment of Coexpression Networks
Model organisms are commonly used to study human diseases and to develop suitable interventions. There are, however, many examples of discrepancies between the results from model experiments and clinical trials in human. To continue improving treatments, it is important to elucidate genetic similarities and differences between model organisms and human. In this work we focus on mice. Rather than comparing sequence similarities alone, we consider coexpression networks, in which simultaneous expression of genes is captured. We perform cross-species analysis by means of network alignment, which has proven a powerful tool for detecting clusters of genes that are conserved across species. In this work we extend an existing network alignment algorithm based on a Lagrangian relaxation approach. We implement a method that identifies modules of conserved coexpression. In addition, we introduce two new score models, which are both capable of detecting these modules. For biological validation of the modules we use a Gene Ontology similarity measure. We illustrate the power of our method by presenting an example module with functionally related genes. Summarized, we present and test a method that can be used to assess the transferability from model experiments to human
Circuit-Model Analysis for Spintronic Devices with Chiral Molecules as Spin Injectors
Recent research discovered that charge transfer processes in chiral molecules
can be spin selective and named the effect chiral-induced spin selectivity
(CISS). Follow-up work studied hybrid spintronic devices with conventional
electronic materials and chiral (bio)molecules. However, a theoretical
foundation for the CISS effect is still in development and the spintronic
signals were not evaluated quantitatively. We present a circuit-model approach
that can provide quantitative evaluations. Our analysis assumes the scheme of a
recent experiment that used photosystem~I (PSI) as spin injectors, for which we
find that the experimentally observed signals are, under any reasonable
assumptions on relevant PSI time scales, too high to be fully due to the CISS
effect. We also show that the CISS effect can in principle be detected using
the same type of solid-state device, and by replacing silver with graphene, the
signals due to spin generation can be enlarged four orders of magnitude. Our
approach thus provides a generic framework for analyzing this type of
experiments and advancing the understanding of the CISS effect
Introducing Advanced Driver Assistance Systems
The introduction of Advanced Driver Assistance Systems (ADAS) in road traffic induces many complex questions. One of them is whether or not present legislation frameworks are able to accommodate a smooth development and market implementation of ADAS. This is strongly related to the aspect of traffic safety. The various aspects related to this issue are categorised based on an exploration of the functionality and possible failure of ADAS. Next, some problem categories are more in-depth elaborated. In particular attention is paid to the need for establishing safety requirements to the design and marketing of ADAS as well as the issue of liability regulation. It is concluded that decision making on safety requirements mainly takes place at an international level. However, so far hardly any requirements regarding ADAS have been laid down in compulsory rules yet. It is further concluded that current legal frameworks in both the fields of vehicle safety standards and liability provide for (some) flexibility towards technical developments regarding ADAS, i.e. these frameworks do not contain many ‘hard rules’ obstructing the introduction of ADAS. Concerning the safety regulation of ADAS it is argued that the speed of technological developments and the innovative and specific nature of ADAS technology generate various tensions. These tensions should have consequences for the weight that is put on public and private intervention mechanisms and the relation between preventive safety standards and reactive regimes such as product liability and post-market controls
Unified description of bulk and interface-enhanced spin pumping
The dynamics of non-equilibrium spin accumulation generated in metals or
semiconductors by rf magnetic field pumping is treated within a diffusive
picture. The dc spin accumulation produced in a uniform system by a rotating
applied magnetic field or by a precessing magnetization of a weak ferromagnet
is in general given by a (small) fraction of hbar omega, where omega is the
rotation or precession frequency. With the addition of a neighboring,
field-free region and allowing for the diffusion of spins, the spin
accumulation is dramatically enhanced at the interface, saturating at the
universal value hbar omega in the limit of long spin relaxation time. This
effect can be maximized when the system dimensions are of the order of sqrt(2pi
D omega), where D is the diffusion constant. We compare our results to the
interface spin pumping theory of A. Brataas et al. [Phys. Rev. B 66, 060404(R)
(2002)]
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