Maternal Abusers: Underlying concerns for children

Child sexual abuse is an emotive topic, which raises public fears and political concerns. Commonly the perpetrators of such abuse are male and their victims female, but evidence suggests that there are a significant number of female perpetrators as well. It is the perceived gendered nature of the crime that creates a stumbling block to the recognition of women who sexually abuse and can silence the child victims. Using data from a wider research project, this paper examines the ways in which female perpetrators rationalise their behaviours and in doing so considers what part these justifications play in silencing the child victims

A computer‐aided continuous assessment system

A high‐quality assessment system should have the following attributes: rapid feedback to the students, appropriate and detailed feedback, and an effective grading system which provides an accurate overall grade as well as information which identifies the student's weak areas. As stafflstudent ratios worsen, providing such a system will become more difficult and consequently computer assistance in this task is becoming more attractive. This paper describes a Computer‐Aided Assessment (CAA) system based on a modified version of the multiple‐choice questionnaire. The CAA has been designed to be used in continuous assessment, with features that discourage plagiarism and provide appropriate feedback Over a hundred students were tested using this CAA and the results were compared with a more traditional assessment system. In addition, questionnaires were used to assess the student's reaction to the CAA. The results were highly satisfactory, and a more advanced version of the original software is under consideration

Momentum-carrying waves on D1-D5 microstate geometries

If one attempts to add momentum-carrying waves to a black string then the solution develops a singularity at the horizon; this is a manifestation of the 'no hair theorem' for black objects. However individual microstates of a black string do not have a horizon, and so the above theorem does not apply. We construct a perturbation that adds momentum to a family of microstates of the extremal D1-D5 string. This perturbation is analogous to the 'singleton' mode localized at the boundary of AdS; to leading order it is pure gauge in the AdS interior of the geometry.Comment: 24 pages, 4 figure

Holographic description of non-supersymmetric orbifolded D1-D5-P solutions

Non-supersymmetric black hole microstates are of great interest in the context of the black hole information paradox. We identify the holographic description of the general class of non-supersymmetric orbifolded D1-D5-P supergravity solutions found by Jejjala, Madden, Ross and Titchener. This class includes both completely smooth solutions and solutions with conical defects, and in the near-decoupling limit these solutions describe degrees of freedom in the cap region. The CFT description involves a general class of states obtained by fractional spectral flow in both left-moving and right-moving sectors, generalizing previous work which studied special cases in this class. We compute the massless scalar emission spectrum and emission rates in both gravity and CFT and find perfect agreement, thereby providing strong evidence for our proposed identification. We also investigate the physics of ergoregion emission as pair creation for these orbifolded solutions. Our results represent the largest class of non-supersymmetric black hole microstate geometries with identified CFT duals presently known.Comment: 35 pages, v2: comments added, typos corrected, reference adde

Free particles from Brauer algebras in complex matrix models

The gauge invariant degrees of freedom of matrix models based on an N x N complex matrix, with U(N) gauge symmetry, contain hidden free particle structures. These are exhibited using triangular matrix variables via the Schur decomposition. The Brauer algebra basis for complex matrix models developed earlier is useful in projecting to a sector which matches the state counting of N free fermions on a circle. The Brauer algebra projection is characterized by the vanishing of a scale invariant laplacian constructed from the complex matrix. The special case of N=2 is studied in detail: the ring of gauge invariant functions as well as a ring of scale and gauge invariant differential operators are characterized completely. The orthonormal basis of wavefunctions in this special case is completely characterized by a set of five commuting Hamiltonians, which display free particle structures. Applications to the reduced matrix quantum mechanics coming from radial quantization in N=4 SYM are described. We propose that the string dual of the complex matrix harmonic oscillator quantum mechanics has an interpretation in terms of strings and branes in 2+1 dimensions.Comment: 64 pages, v2: Exposition improved, minor corrections; v3: Typos corrected, published versio

Management Awareness and Strategies for the Contemporary African Manager of Organizations

This paper addresses a topical issue: management awareness and strategies for the contemporary African manager. The overall aim of the work is to provide a framework for improved management practices for the manager and the intervener in both private and public sectors. This frame-work is not limited to the African manager but has a wider application for other managers of organizations. In pursuant of this objective, relevant key management concepts are explored and discussed bearing in mind that the subject of management is a dynamic and universal phenomenon. Emphasis is placed on the features of the endowed person and the potentials of the human being as the manager and as the most effective contributor to organizational life.The identified concepts and their properties are interwoven. Other highlights are: (i) the universality in the applications or practices of management; (ii) the peculiarity in the applications and practices of management in different environments or social settings; (iii) management practices, problems and prospects in the African settings (See Table I). Cases cited and examples drawn are meant inter alia to strengthen the objectives of the study

Stokes−Einstein−Debye failure in molecular orientational diffusion: exception or rule?

The Stokes–Einstein–Debye (SED) expression is used routinely to relate orientational molecular diffusivity quantitatively to viscosity. However, it is well-known that Einstein’s equations are derived from hydrodynamic theory for the diffusion of a Brownian particle in a homogeneous fluid and examples of SED breakdown and failure for molecular diffusion are not unusual. Here, using optical Kerr-effect spectroscopy to measure orientational diffusion for solutions of guanidine hydrochloride in water and mixtures of carbon disulfide with hexadecane, we show that these two contrasting systems each show pronounced exception to the SED relation and ask if it is reasonable to expect molecular diffusion to be a simple function of viscosity