Double beta decay and the proton-neutron residual interaction

The validity of the pn-QRPA and -RQRPA descriptions of double beta decay transition amplitudes is analyzed by using an exactly solvable model. It is shown that the collapse of the QRPA is physically meaningful and that it is associated with the appearance of a state with zero energy in the spectrum. It is shown that in the RQRPA this particular feature is not present and that this approach leads to finite but otherwise spurious results for the double beta decay transition amplitudes near the point of collapse.Comment: LaTeX, 10 pages plus 3 fugures as LaTeX files. Accepted for publication in Physics Letters

Single- and double-beta decay Fermi-transitions in an exactly solvable model

An exactly solvable model suitable for the description of single and double-beta decay processes of the Fermi-type is introduced. The model is equivalent to the exact shell-model treatment of protons and neutrons in a single j-shell. Exact eigenvalues and eigenvectors are compared to those corresponding to the hamiltonian in the quasiparticle basis (qp) and with the results of both the standard quasiparticle random phase approximation (QRPA) and the renormalized one (RQRPA). The role of the scattering term of the quasiparticle hamiltonian is analyzed. The presence of an exact eigenstate with zero energy is shown to be related to the collapse of the QRPA. The RQRPA and the qp solutions do not include this zero-energy eigenvalue in their spectra, probably due to spurious correlations. The meaning of this result in terms of symmetries is presented.Comment: 29 pages, 9 figures included in a Postsript file. Submitted to Physcal Review

Review of Application of Artificial Neural Networks in Textiles and Clothing Industries over Last Decades

2010-2011 > Academic research: refereed > Chapter in an edited book (author

Improving the Strategies for Quality Services Provision in Technical University Libraries, Ghana

The study was an assessment of improving the strategies for quality services provision in university libraries in Ghana focusing on technical university libraries. The study investigated issues such as the perception of library services, strategies of improving the library services and user satisfaction of libraries services at technical university libraries. The study, used a descriptive survey design with students at levels 100 through to 400 from all the five faculties from a technical university library in Ghana. Out of 100 copies of questionnaire distributed, 60 copies were completed and retrieved. This represented 60% of the sample size. The results show that leisure activities are the main reason students visit the library, however academic reasons certainly play a part.  Although issues over out-of-date materials and restricted operating hours were mentioned, positive interactions with library workers and satisfaction with the resources available were acknowledged. The study emphasizes that the most important ways to improve library services is to improve the technology infrastructure, which includes providing computers, internet access, and contemporary resources. By concentrating on infrastructure, user support, and the modernization of academic materials, the study offers practical suggestions for enhancing university library services with the ultimate goal of raising user happiness and assisting students' academic achievement. Keywords: University library, service quality, user satisfaction, technological infrastructure, Koforidua Technical University. DOI: 10.7176/JEP/16-3-01 Publication date: March 30th 202

Chemical Sensors - Analytical Instruments

Recent developments in our laboratory belonging to two main areas of current interest, namely amperometric gas sensors and capillary electrophoresis instrumentation, are highlighted. An improved design of the former devices allows the determination of electroactive gases, such as ethylene, ethanol, and sulfur dioxide down to 1 ppb (v/v) levels. For capillary electrophoresis, a field-portable instrument with electrochemical detection was recently devised

OXYGEN REACTIVE POLYMERS FOR TREATMENT OF TRAUMATIC BRAIN INJURY

Methods and compositions for treating traumatic brain injury . The methods and compositions utilize a multi - functional oxygen reactive polymer ( ORP ) that includes repeating units that include a reactive oxygen species ( ROS ) scavenging group and a polyalkylene oxide group . For theranostic applications , the oxygen reactive polymer fur ther includes a diagnostic group