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151.
Shao-Bo Mi 《Philosophical Magazine Letters》2013,93(5):264-272
The microstructure of interfacial defects in YBa2Cu3O7-δ/SrTiO3(0?0?1) heterostructures has been investigated by aberration-corrected ultrahigh-resolution electron microscopy. We determine that c-axis-oriented YBa2Cu3O7-δ thin films epitaxially grow on SrTiO3(0?0?1) with two types of interface structure. The coalescence of nucleation sites with different types of interface structure leads to the formation of antiphase domain boundaries in YBa2Cu3O7-δ thin films, which terminate at planar faults with different configurations near the interface. Stand-off misfit dislocations are observed and the dislocation core structure is explored. Based on the interface structure and interfacial defects, the initial growth mode of YBa2Cu3O7-δ thin films on SrTiO3(0?0?1) is discussed. 相似文献
152.
Luca Bindi 《Philosophical Magazine Letters》2013,93(7):533-541
To study the temperature-dependent structural changes and to analyze the crystal chemical behavior of silver as a function of temperature, a crystal of muthmannite, AuAgTe2, has been investigated by X-ray single-crystal diffraction methods at 300 K and 110 K. At room temperature, muthmannite was confirmed as belonging to the space group P2/m, while at low temperature (110 K) it undergoes a reversible commensurate–incommensurate phase transition with a modulation wave vector q = 0.215(1)a* + 0.379(2)c*. Muthmannite reconverts to the commensurate type upon returning to room temperature, thus indicating that the phase transition is completely reversible in character. The average structure of the low-temperature muthmannite remains monoclinic, space group P2/m, and shows only normal thermal compression over the entire temperature range investigated. Crystal-chemical characteristics are compared with published data on the other members of the system Au–Ag–Te. Speculations on the possible origin of the modulated structure at low temperature are also given. 相似文献
153.
J. P. A. Löfvander S. A. Court M. H. Loretto H. L. Fraser 《Philosophical Magazine Letters》2013,93(3):111-116
Abstract The rôle of dislocations with Burgers vectors, b, given by b = [0001] during deformation of samples of the intermetallic compound Ti3Al has been assessed. At room temperature, the experimental evidence is consistent with these dislocations being sessile, their density and morphology being similar to that in undeformed samples. In samples deformed at 650°C and above, it is concluded that motion of these dislocations is effected by dislocation climb. The line directions of the various segments of dislocations with b= [0001] are shown to be perpendicular to planes that contain sheets of Ti atoms, with an expected tendency to exhibit a high Peierls stress. 相似文献
154.
155.
S. Çetinkaya H.A. Çetinkara S. Kahraman F. Bayansal 《Philosophical Magazine Letters》2013,93(9):550-559
We report the fabrication of Al/n-ZnO/p-Si/Al diode structures with a flower-like ZnO layer. The average grain size, microstrain and dislocation density in the ZnO layer were determined as 25?nm, 1.55?×?10?3 and 3.23?×?1013?cm?2, respectively. From absorption spectra, the optical band gap was found to be ～3.17?eV. A red shift was attributed to non-stoichiometry arising from Zn+2 ions substituting for oxygen vacancies. The ideality factor was determined as 1.55. The barrier height was calculated as 0.71?eV from I–V characteristics and 0.73?eV using the Norde plots. 相似文献
156.
Joana Acha Alejandro Pérez Doug J. Davidson Manuel Carreiras 《Child neuropsychology》2013,19(5):693-715
157.
Pediatric traumatic brain injury is a significant public health concern affecting hundreds of thousands of children each year. The majority of children who sustain traumatic brain injuries are classified as having a mild traumatic brain injury, and a subset of these children go on to experience persistent physical, cognitive, and emotional symptoms. These symptoms, known as postconcussive symptoms, can endure for months and even years after injury. The outcomes of mild traumatic brain injury are variable and not well understood for a small percentage of children who experience persistent symptoms. The current article explores the potential influence of children’s posttraumatic stress symptoms on persistent postconcussive symptoms. Despite the high incidence of posttraumatic stress symptoms after pediatric accidental injury, they have not yet been identified as an important factor for consideration in the understanding of pediatric postconcussive outcomes. The article will review the literature on posttraumatic stress and postconcussive symptoms after pediatric injury and consider neurobiological and cognitive factors to propose a model explaining a pathway through which posttraumatic stress reactions may serve as the mechanism for the expression and maintenance of postconcussive symptoms after mild traumatic brain injury. The clinical implications for the proposed relationship between posttraumatic stress symptoms and postconcussive symptoms are considered prior to the conclusion of the article, which acknowledges limitations in the current literature and provides suggestions for future research. 相似文献
158.
Izelinda Garcia de Barros 《The International journal of psycho-analysis》2012,93(6):1427-1437
The author argues that the ubiquity of phantasies at various levels of mental functioning is undisputed in the current schools of psychoanalytic thought; however, she demonstrates some variations in their understanding of how the psychotherapeutic access to different configurations occurs. In the process of examining and acknowledging the central role played by unconscious phantasies in his patients’ symptoms, Freud gradually broadened the vernacular meaning of the German word ‘Phantasie’ that refers to imagination and the world of imagination, conferring on it the specific features that came to characterize its use in the psychoanalytic vocabulary. Later, the expansion of the concept derived from Melanie Klein’s clinical material obtained from child analyses gave rise to important debates. The author discusses the main points of disagreement that led to these debates, as well as their various theoretical and technical implications. Psychoanalytic associations in Latin America were strongly influenced by Klein and her followers. Thus, most of their scientific writings use the concept of unconscious phantasy put forward by the Kleinian school. Taking Kleinian principles as their starting point, Baranger and Baranger made the most original Latin American contribution to the concept of unconscious phantasy with their works on the unconscious phantasies generated by the analytic pair. 相似文献
159.
Robin Balbernie 《Journal of Child Psychotherapy》2013,39(3):237-255
The last decade has seen a vast increase in knowledge of how the human brain develops. It has been demonstrated that both the establishment of synaptic connections between neurones and the programming of neurochemical responses that have an effect on the whole body are dependent on experience. The most sensitive period for brain growth, the time of optimal plasticity, is over the first two or three years of life. If the baby's neurological development is threatened by abuse or neglect, which includes excessive attachment disruption, the damage may set its stamp on the rest of life. 相似文献
160.
This study’s specific aim was to determine if non-experts’ most accurate motor performance is associated with verbal-analytic- and working memory-related cerebral cortical activity during motor preparation. To assess this, EEG was recorded from non-expert golfers executing putts; EEG spectral power and coherence were calculated for the epoch preceding putt execution; and spectral power and coherence for the five most accurate putts were contrasted with that for the five least accurate. Results revealed marked power in the theta frequency bandwidth at all cerebral cortical regions for the most accurate putts relative to the least accurate, and considerable power in the low-beta frequency bandwidth at the left temporal region for the most accurate compared to the least. As theta power is associated with working memory and low-beta power at the left temporal region with verbal analysis, results suggest non-experts’ most accurate motor performance is associated with verbal-analytic- and working memory-related cerebral cortical activity during motor preparation. 相似文献