Early stage of weathering of medieval-like potash–lime model glass: evaluation of key factors

Purpose  

Throughout history, a consequent part of the medieval stained glass windows have been lost, mostly because of deliberate or accidental mechanic destruction during war or revolution, but, in some cases, did not withstand the test of time simply because of their low durability. Indeed, the glasses that remain nowadays are for many in a poor state of conservation and are heavily deteriorated. Under general exposure conditions, stained glass windows undergo different kinds of weathering processes that modify their optical properties, chemistry, and structure: congruent dissolution, leaching, and particle deposition (the combination of those two leading together to the formation of neocrystallisations and eventually crusts). Previous research has studied the weathering forms and the mechanisms from which they are originated, some others identified the main environmental parameters responsible for the deterioration and highlighted that both intrinsic (glass composition) and extrinsic (environmental parameters) factors influence glass degradation. Nevertheless, a clear quantification of the impact of the different deterioration extrinsic factors has not been performed.     

Utilizing a 'systems' approach to improve the management of waste from healthcare facilities: best practice case studies from England and Wales.

Changes in environmental legislation and standards governing healthcare waste, such as the Hazardous Waste Regulations are expected to have a significant impact on healthcare waste quantities and costs in England and Wales. This paper presents findings from two award winning case study organizations, the Cardiff and Vale NHS Trust and the Cornwall NHS Trust on 'systems' they have employed for minimizing waste. The results suggest the need for the development and implementation of a holistic range of systems in order to develop best practice, including waste minimization strategies, key performance indicators, and staff training and awareness. The implications for the sharing of best practice from the two case studies are also discussed.     

Prenatal identification of small mosaic markers of different chromosomal origins

In situ hybridization using a series of alphoid DNA probes has demonstrated the origin of two small accessory mosaic marker chromosomes ascertained from 1079 amniocenteses. These markers appeared to be de novo, derived from acrocentric chromosomes, and identical by traditional cytogenetic staining (G, Q, C, AgNOR, Hoechst-distamycin). Molecular characterization showed that one marker had originated from chromosome 14, the other from chromosome 22. Clinical outcome in both cases was normal.     

Reactions to psychological contract breach: a dual perspective

This study examined reactions to psychological contract breach from two separate perspectives, that is, employee's reactions to perceptions of employer breach and supervisor's reactions to perceptions of employee breach of the psychological contract. In addition to the main effects, we also hypothesized that the benevolence (or kindness) of the supervisor and the traditional values (or respect for authority) of the employee would attenuate the negative effects of psychological contract breach. We tested these hypotheses with a sample of 273 supervisor‐subordinate dyads from the People's Republic of China. The results showed that employer breach correlated negatively with employee outcomes of organizational commitment (OC), organizational citizenship behavior (OCB), and work performance, but this negative relationship was weaker for employees with traditional values. The results also demonstrated that employee breach correlated negatively with responses from the supervisor, in terms of the mentoring provided to the employee and the leader‐member exchange (LMX) quality. However, more benevolent supervisors reacted less negatively in terms of the mentoring than did the less benevolent supervisors. Implications for future research are offered. Copyright © 2007 John Wiley & Sons, Ltd.     

Cost-effectiveness analysis of the seamistTM borehole liner system

SEAMIST^TM is an innovative technology that facilitates measurements of contaminants in both vertical and horizontal boreholes. The essence of SEAMIST^TM is an airtight membrane liner pneumatically emplaced inside the borehole and maintained with positive pressure. Sampling ports, absorbent collectors, and various in-situ measuring devices can be fabricated into the liner. Small instruments and cameras can be guided through the borehole to obtain real-time data. This article reports on the cost and performance effectiveness of this new technology. In this report, SEAMIST^TM is evaluated as a tool for obtaining data on volatile organic compounds, semivolatile organic compounds, other water-borne contaminants, and radionuclides. SEAMIST^TM is also compared to traditional borehole casing, to conventional soil vapor probes, and to conventional pore-fluid collecting lysimeters. The most cost- and performance-effective applications of SEAMIST^TM are shown to be those applications for which multiple characterization requirements can be combined into one SEAMIST^TM membrane system.