6,607 research outputs found
The lived experience of therapeutic work in the midst of grief: an existential phenomenological study
This dissertation explores the humanistic therapistâs lived experience of loss following bereavement and how a bereaved therapist manages their client work in the midst of their grief. This qualitative phenomenological research was conducted on the basis of semi-structured interviews with seven participants (all of them practising therapists who had experienced recent bereavement), whose accounts were then analysed using Interpretative Phenomenological Analysis. Four main themes were identified. The first highlighted the overwhelming and disorientating experience of grief on an instinctual level. The second dealt with how the participants sought to manage the therapeutic encounter by relying on technique and their professional identity. The third theme explored the positive as well as negative ways in which grief impacted participantsâ work with clients. The fourth and final theme explored the expansion of self which seemed to result from participantsâ experience of loss in combination with their continuing therapeutic work. This study seeks to contribute to the under-researched area of therapist bereavement and the impact of grief or vulnerability on the therapeutic encounter. Its findings suggest that therapistsâ experiences of loss involve complex dynamics with important implications both for therapists themselves and for the therapeutic relationship. The study recommends that further research be undertaken into how therapists are affected by significant life crises, how they manage their own vulnerabilities, and how they navigate therapeutic processes in the midst of bereavement
Convergence in Energy-Lowering (Disordered) Stochastic Spin Systems
We consider stochastic processes, S^t \equiv (S_x^t : x \in Z^d), with each
S_x^t taking values in some fixed finite set, in which spin flips (i.e.,
changes of S_x^t) do not raise the energy. We extend earlier results of
Nanda-Newman-Stein that each site x has almost surely only finitely many flips
that strictly lower the energy and thus that in models without zero-energy
flips there is convergence to an absorbing state. In particular, the assumption
of finite mean energy density can be eliminated by constructing a
percolation-theoretic Lyapunov function density as a substitute for the mean
energy density. Our results apply to random energy functions with a
translation-invariant distribution and to quite general (not necessarily
Markovian) dynamics.Comment: 11 page
Clusters and Recurrence in the Two-Dimensional Zero-Temperature Stochastic Ising Model
We analyze clustering and (local) recurrence of a standard Markov process
model of spatial domain coarsening. The continuous time process, whose state
space consists of assignments of +1 or -1 to each site in , is the
zero-temperature limit of the stochastic homogeneous Ising ferromagnet (with
Glauber dynamics): the initial state is chosen uniformly at random and then
each site, at rate one, polls its 4 neighbors and makes sure it agrees with the
majority, or tosses a fair coin in case of a tie. Among the main results
(almost sure, with respect to both the process and initial state) are: clusters
(maximal domains of constant sign) are finite for times , but the
cluster of a fixed site diverges (in diameter) as ; each of the
two constant states is (positive) recurrent. We also present other results and
conjectures concerning positive and null recurrence and the role of absorbing
states.Comment: 16 pages, 1 figur
Upward Tau Air Showers from Earth
We estimate the rate of observable Horizontal and Upward Tau Air-Showers
(HORTAUs, UPTAUS) considering both the Earth opacity and the finite size of the
terrestrial atmosphere. We calculate the effective target volumes and masses
for Tau air-showers emerging from the Earth. The resulting model-independent
masses for satellite experiments such as EUSO may encompass at E_nu_tau = 10^19
eV a very large volume, V= 1020 km^3. Adopting simple power law neutrino
fluxes, E^-2 and E^-1, calibrated to GZK-like and Z-Burst-like models, we
estimate that at E= 10^19 eV nearly half a dozen horizontal shower events
should be detected by EUSO in three years of data collection by the
"guaranteed" GZK neutrino flux. We also find that the equivalent mass for an
Earth outer layer made of rock is dominant compared to the water, contrary to
simplified all-rock/all-water Earth models and previous Montecarlo simulations.
Therefore we expect an enhancement of neutrino detection along continental
shelves nearby the highest mountain chains, also given the better geometrical
acceptance for Earth skimming neutrinos. The Auger experiment might reveal such
a signature at E_nu= 10^{18} eV (with 26 events in 3 yr) towards the Andes, if
the angular resolution at the horizon (both in azimuth and zenith) would reach
an accuracy of nearly one degree needed to disentangle tau air showers from
common UHECR. The number of events increases at lower energies; therefore we
suggest an extension of the EUSO and Auger sensitivity down to (or even below)
E_nu = 10^19 eV and E_nu = 10^18 eV respectively.Comment: New version resubmitted to ApJ on the 6th April 2004; 55 Pages,20
figures, major changes following referee reques
Coordination defects in a-Si and a-Si:H : a characterization from first principles calculations
We study by means of first-principles pseudopotential method the coordination
defects in a-Si and a-Si:H, also in their formation and their evolution upon
hydrogen interaction. An accurate analysis of the valence charge distribution
and of the ``electron localization function'' (ELF) allows to resolve possible
ambiguities in the bonding configuration, and in particular to identify clearly
three-fold (T_3) and five-fold (T_5) coordinated defects. We found that
electronic states in the gap can be associated to both kind of defects, and
that in both cases the interaction with hydrogen can reduce the density of
states in the gap.Comment: To appear in Philos. Ma
Data and performance of an active-set truncated Newton method with non-monotone line search for bound-constrained optimization
In this data article, we report data and experiments related to the research article entitled âA Two-Stage Active-Set Algorithm for Bound-Constrained Optimizationâ, by Cristofari et al. (2017). The method proposed in Cristofari et al. (2017), tackles optimization problems with bound constraints by properly combining an active-set estimate with a truncated Newton strategy. Here, we report the detailed numerical experience performed over a commonly used test set, namely CUTEst (Gould et al., 2015). First, the algorithm ASA-BCP proposed in Cristofari et al. (2017) is compared with the related method NMBC (De Santis et al., 2012). Then, a comparison with the renowned methods ALGENCAN (Birgin and MartĂnez et al., 2002) and LANCELOT B (Gould et al., 2003) is reported
A comparative study of the leisure-time interests of 100 girls during their last year in junior high school and their first year in senior high school.
Thesis (Ed.M.)--Boston Universit
Next generation bioengineering of lung tissue for transplantation
Lung transplantation is the only option for end-stage lung diseases, but organ shortage remains problematic. Generating lungs ex vivo could overcome shortages with current approaches being explored for lung tissue engineering utilizing a biologically derived, synthetic or hybrid scaffold which is seeded with cells and cultured ex vivo. Ideally, cells could be sourced from the transplant recipient and thus are conceptualized to reduce the long-term requirements for immunosuppressive drugs and the risk for rejection. Progenitor cell populations can be controlled more easily than induced pluripotent stem cells (IPSCs), with lower risk of tumour formation. However, as presented in this thesis, progenitor cells can be deranged in diseased lungs such as for example idiopathic pulmonary fibrosis (IPF) and are therefore unlikely candidates to generate healthy tissue. In addition to healthy cells, scaffolds with attributes known to be pro-regenerative are required to generate healthy tissues. In the thesis it is shown that both scaffold and cell age plays a role in the regenerative capacity of a tissue. From this it is clear that to generate a healthy tissue or organ, it is critical to find the appropriate scaffold and cell type. Additionally, bioengineering manufacturing methods that generate reproducible, custom-made, high resolution constructs using cytocompatible materials are ideal for tissue engineering approaches. One such method which is compatible with the criteria above and that has emerged in recent years is 3D printing. 3D printing or bioprinting (when cells are printed) can generate custom structures relevant for human lungs. In this thesis, potential bioinks for bioprinting lung tissue are investigated. A tissue-specific hybrid bioink consisting of alginate, reinforced with extracellular matrix from decellularized lung tissue (rECM) was used to 3D bioprint human airways comprised of regionally specified primary cells which remained patent over time. The biocompatibility and vascularisation of rECM hydrogels was investigated in both T-cell immunodeficient mice mimicking the clinical scenario and immunocompetent mice. Bioprinted rECM hydrogels support the formation of an intact vascular network throughout the full thickness of the graft, comprised of both large and small size blood vessels and integrate well in the surrounding tissue
A nonmonotone GRASP
A greedy randomized adaptive search procedure (GRASP) is an itera-
tive multistart metaheuristic for difficult combinatorial optimization problems. Each
GRASP iteration consists of two phases: a construction phase, in which a feasible
solution is produced, and a local search phase, in which a local optimum in the
neighborhood of the constructed solution is sought. Repeated applications of the con-
struction procedure yields different starting solutions for the local search and the
best overall solution is kept as the result. The GRASP local search applies iterative
improvement until a locally optimal solution is found. During this phase, starting from
the current solution an improving neighbor solution is accepted and considered as the
new current solution. In this paper, we propose a variant of the GRASP framework that
uses a new ânonmonotoneâ strategy to explore the neighborhood of the current solu-
tion. We formally state the convergence of the nonmonotone local search to a locally
optimal solution and illustrate the effectiveness of the resulting Nonmonotone GRASP
on three classical hard combinatorial optimization problems: the maximum cut prob-
lem (MAX-CUT), the weighted maximum satisfiability problem (MAX-SAT), and
the quadratic assignment problem (QAP)
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