The Experts below are selected from a list of 210 Experts worldwide ranked by ideXlab platform
Graham Dunn - One of the best experts on this subject based on the ideXlab platform.
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what makes one person paranoid and another person anxious the differential prediction of social anxiety and persecutory ideation in an Experimental Situation
Psychological Medicine, 2008Co-Authors: Daniel Freeman, Matthew Gittins, Katherine Pugh, Angus Antley, Mel Slater, Graham DunnAbstract:Results. The strongest finding was that the presence of perceptual anomalies increased the risk of paranoid reactions but decreased the risk of social anxiety. Anxiety, depression, worry and interpersonal sensitivity all had similar associations with paranoia and social anxiety. Conclusions. The study shows that social anxiety and persecutory ideation share many of the same predictive factors. Non-clinical paranoia may be a type of anxious fear. However, perceptual anomalies are a distinct predictor of paranoia. In the context of an individual feeling anxious, the occurrence of odd internal feelings in social Situations may lead to delusional ideas through a sense of ‘ things not seeming right ’. The study illustrates the approach of focusing on experiences such as paranoid thinking rather than diagnoses such as schizophrenia.
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What makes one person paranoid and another person anxious? The differential prediction of social anxiety and persecutory ideation in an Experimental Situation
PSYCHOL MED, 2008Co-Authors: Graham DunnAbstract:Background. In recent years a close association between anxiety and persecutory ideation has been established, contrary to the traditional division of neurosis and psychosis. Nonetheless, the two experiences are distinct. The aim of this study was to identify factors that distinguish the occurrence of social anxiety and paranoid thoughts in an Experimental Situation.Method. Two hundred non-clinical individuals broadly representative of the UK general population were assessed on a range of psychological factors, experienced a neutral virtual reality social environment, and then completed state measures of paranoia and social anxiety. Clustered bivariate logistic regressions were carried out, testing interactions between potential predictors and the type of reaction in virtual reality.Results. The strongest finding was that the presence of perceptual anomalies increased the risk of paranoid reactions but decreased the risk of social anxiety. Anxiety, depression, worry and interpersonal sensitivity all had similar associations with paranoia and social anxiety.Conclusions. The study shows that social anxiety and persecutory ideation share many of the same predictive factors. Non-clinical paranoia may be a type of anxious fear. However, perceptual anomalies are a distinct predictor of paranoia. In the context of an individual feeling anxious, the occurrence of odd internal feelings in social Situations may lead to delusional ideas through a sense of 'things not seeming right'. The study illustrates the approach of focusing on experiences such as paranoid thinking rather than diagnoses such as schizophrenia.
A M Goldman - One of the best experts on this subject based on the ideXlab platform.
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superconductor insulator transitions in 2d the Experimental Situation
Physica Status Solidi B-basic Solid State Physics, 2000Co-Authors: Nina Markovic, C Christiansen, A M Mack, A M GoldmanAbstract:Superconductor–insulator (SI) transitions in ultrathin films have attracted significant attention over the last decade because of the possibility that they are quantum phase transitions. Magnetic field, film thickness, or carrier concentration can be used as control parameters. The bosonic pictures of these transitions proposed some years ago are only in qualitative agreement with experiment. In particular, the critical resistance appears not to be universal, and there are variations in the values of critical exponents. It has been concluded that in real films fermionic degrees of freedom must be taken into account. There are also indications that the phase diagram may include a significant metallic phase separating the superconducting and insulating phases, and that the transition may have a significant percolative aspect. The Experimental Situation will be broadly reviewed with attention paid to issues relating to materials and measurements.
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Superconductor–Insulator Transitions in 2D: The Experimental Situation
Physica Status Solidi B-basic Solid State Physics, 2000Co-Authors: Nina Markovic, C Christiansen, A M Mack, A M GoldmanAbstract:Superconductor–insulator (SI) transitions in ultrathin films have attracted significant attention over the last decade because of the possibility that they are quantum phase transitions. Magnetic field, film thickness, or carrier concentration can be used as control parameters. The bosonic pictures of these transitions proposed some years ago are only in qualitative agreement with experiment. In particular, the critical resistance appears not to be universal, and there are variations in the values of critical exponents. It has been concluded that in real films fermionic degrees of freedom must be taken into account. There are also indications that the phase diagram may include a significant metallic phase separating the superconducting and insulating phases, and that the transition may have a significant percolative aspect. The Experimental Situation will be broadly reviewed with attention paid to issues relating to materials and measurements.
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High-Temperature Superconductivity: The Experimental Situation
Electronic Materials, 1991Co-Authors: A M GoldmanAbstract:The various classes of oxide superconductors have critical temperatures which greatly exceed those of so-called conventional materials [6.1–5]. They may also have enormous critical magnetic fields as well, depending on the particular extrapolation employed. It is, however, as yet unknown whether large critical currents can be achieved for bulk material in a magnetic field. The prospects for a new generation of superconducting electronic devices and sensors are just beginning to be explored. The potential impact on technology of the new high temperature superconductors has been the driving force behind the enormous volume of work in the field over the last few years. The frenzied pace of research is consistent with its importance, given the words of the Soviet physicist V.L. Ginzburg [6.6]. He contends that the problem of high temperature (ultimately room temperature) superconductivity may be the second most important problem in physical science, behind that of controlled fusion, in terms of its potential impact on society.
H. A Mcl Tailin - One of the best experts on this subject based on the ideXlab platform.
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Spin physics
Journal of Physics G: Nuclear and Particle Physics, 1999Co-Authors: R. D. Ball, H. A Mcl TailinAbstract:We review the current Situation in polarized scattering experiments. We describe the theoretical interpretation of inclusive deep inelastic processes, the current Experimental Situation and perturbative analyses which extract structure functions and parton distribution functions. We also discuss various issues such as positivity constraints, small x and the possibility of polarized colliding beam experiments at HERA, semi-inclusive processes, the separation of flavors and the measurement of the gluon polarization, and the possibility of using polarisation experiments to put constraints on new physics.
G Subias - One of the best experts on this subject based on the ideXlab platform.
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mn local structure effects in charge ordered mixed valence re1 xcaxmno3 re la tb perovskites a review of the Experimental Situation
Journal of Physics: Condensed Matter, 2002Co-Authors: G Subias, Joaquin Garcia, Javier Blasco, Concepcion M Sanchez, Grazia M ProiettiAbstract:An extensive extended x-ray absorption fine-structure (EXAFS) study at the Mn K edge of the La 1-x Ca x MnO 3 and Tb 1-x Ca x MnO 3 (x ≥ 0.5) series, as a function of temperature up to values around 600 K, has been performed. An accurate multiple-scattering analysis has been carried out; it shows that the paramagnetic phase (T > 300 K) of the so-called charge-ordered manganites is characterized by a random distribution of distorted octahedra, the distortion being less than the Jahn-Teller distortion of the undoped compounds. No significant changes are found for the first coordination shell (Mn-O) crossing the charge-ordering transition and the local distortion remains over the whole temperature range. Moreover, the local structure around the Mn atom in these charge-ordered compounds is also not consistent with a linear combination of Jahn-Teller-distorted (Mn 3+ ) and non-distorted (Mn 4+ ) octahedra over the whole temperature range. On the other hand, the structural analysis up to the second coordination shell indicates that the Mn-O-Mn bond angle is the most relevant parameter for understanding the electrical and magnetic properties of these compounds. Finally, an alternative structural mechanism is proposed to explain the different phase transitions in mixed-valence manganites.
Daniel Freeman - One of the best experts on this subject based on the ideXlab platform.
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what makes one person paranoid and another person anxious the differential prediction of social anxiety and persecutory ideation in an Experimental Situation
Psychological Medicine, 2008Co-Authors: Daniel Freeman, Matthew Gittins, Katherine Pugh, Angus Antley, Mel Slater, Graham DunnAbstract:Results. The strongest finding was that the presence of perceptual anomalies increased the risk of paranoid reactions but decreased the risk of social anxiety. Anxiety, depression, worry and interpersonal sensitivity all had similar associations with paranoia and social anxiety. Conclusions. The study shows that social anxiety and persecutory ideation share many of the same predictive factors. Non-clinical paranoia may be a type of anxious fear. However, perceptual anomalies are a distinct predictor of paranoia. In the context of an individual feeling anxious, the occurrence of odd internal feelings in social Situations may lead to delusional ideas through a sense of ‘ things not seeming right ’. The study illustrates the approach of focusing on experiences such as paranoid thinking rather than diagnoses such as schizophrenia.
