Work role centrality of industrial workers as related to organizational conditions,task autonomy,managerial orientations and personal characteristics

The study shows that, for a sample of 818 industrial workers, work role centrality (WRC) is positively related to task autonomy and to organizational conditions of sector of ownership, unit-type of production system, and production stability; it is also weakly related to the orientations of production managers concerning the sharing of information, general supervision and granting autonomy. The task autonomy - work role centrality relationship is maintained beyond other organizational conditions, but the effects of managerial orientations are attenuated by task autonomy and by organizational conditions. Situational conditions such as production system and stability, managerial orientations and task autonomy add to the variance of WRC explained by personal attributes of gender, education and job training, and by the outcome of job satisfaction, and a combined model of both types of variables is the most efficient. Generally, work role centrality is found to be a fairly sensitive response to the work situation, but it is suggested that perceptual and attitudinal data be added to the explanatory model.     

Non-aqueous-phase-liquid breakthrough during evaporative drying of clay barriers

In this study, an attempt has been made to model a real field scenario, whereby an initially almost saturated clay liner in a waste site is gradually drying, due to evaporation at its lower boundary. A detailed conceptual model that deals with the penetration and breakthrough of non-aqueous-phase-liquid (NAPL) in clay liners is introduced. Water content of clay samples was monitored during ambient evaporation through apertures at the base of sample holders. Clay drying rate served as the primary parameter for the NAPL breakthrough study. The interconnection between drying rates, structural damage formation (cracks and suction) and NAPL penetration is especially addressed. The processes taking place in the clay samples during drying appear to be associated with the capillary effects between the different fluid phases in the vicinity of either the NAPL-clay or the clay-air boundaries. A conceptual model of NAPL penetration and breakthrough of the clay layer has been considered, based on both indirect and direct observations of structural damages produced on either clay boundaries. A mutual interaction between these two boundaries is suggested and discussed. NAPL breakthrough is suggested to take place through cracks initiated on the upper soil surface.     

Carbon neutral Biggar: calculating the community carbon footprint and renewable energy options for footprint reduction

The objective of this research was to develop a community carbon footprint model that could be used to assess the size and major components of a community’s carbon dioxide (CO₂) emissions. The town of Biggar aims to become Scotland’s first carbon neutral town. As expected for this rural community, car transport accounted for nearly half of the CO₂ emissions, with natural gas and electricity consumption resulting in a further 24% and 12% of total emissions, respectively, and air travel being the last major component at 10% of emissions. An assessment was also made of the wind and solar resources of the town. One large wind turbine would provide the town’s electricity, while three to four turbines would be needed to offset all CO₂ emissions. In contrast, offsetting by tree planting would require in the region of 2,000 ha of trees.

Family structure,job characteristics,rewards and strains as related to work-role centrality of employed and self-employed professional women with children

This study of the work-role centrality (WRC) of 419 professional women with children in Israel was carried out by means of a mailed questionnaire. WRC measures cognitive investments in the work role, relative to the person's other roles. The results show that these women generally are highly work-centred, autonomous and rewarded, and experience little work overload, but some person-role conflict on the job. Employment status, job scope, job autonomy and career anchorage, as well as job rewards, especially intrinsic, are strongly related to work-role centrality. Family characteristics are not related to WRC. Despite their demanding jobs, these women still perform the traditionally feminine tasks in the family, even when husbands are supportive. Employment status is an important intervening variable in the relationship of WRC and other job characteristics.     

Managers' coping resources,perceived organizational patterns,and responses during organizational recovery from decline

This study proposes that individual coping resources and organizational patterns explain the responses of mid‐level managers to organizational recovery after decline. The study sample consisted of 252 managers in Israeli enterprises recovering from organizational decline. The responses studied were—citizenship responses, negative responses, the wish to exit and acts to exit the organization. Hypotheses were developed relating these responses to individual coping resources of job involvement, self‐esteem and locus of control, and to organizational factors of organic processes, top management support, and organizational opportunities. Findings indicated that most coping resources and organizational patterns correlated with type of response: citizenship behaviors were related to job involvement, internal locus of control, self‐esteem and to perceptions of opportunities and organic processes in the organization. They were negatively related to external locus of control. Negative behavior was negatively related to job involvement, self‐esteem, perceived organizational opportunities and organic processes. The wish to exit related negatively to job involvement, external locus of control, and perceived opportunities. It related positively to self‐esteem. Actual exit behavior was not predicted by the coping resources, nor by organizational factors. Three‐stage multiple regression analyses revealed that individual coping characteristics reduced the impacts of organizational factors for most responses. Implications for management are discussed. Copyright © 1999 John Wiley & Sons, Ltd.     

Suppressor cells prevent host resistance to tumor growth

The role of immunosuppressor cells in preventing host immune rejection of tumor cells is described. The growth of Lewis lung carcinoma (3LL) in syngeneic C57BL mice is accompanied by a weak and transient anti-tumor cytotoxic response that is later on replaced by tumor-enhancing activity. This enhancing activity is correlated with the generation of suppressor cells in 3LL-bearing mice. Such suppressors were demon strated in two ways: (a) Elimination of the hydrocortisone(HC)-sensitive lymphoid population from tumorbearing mice (TBM) resulted in a significant increase in the anti-tumor cytotoxic response and in a marked delay in tumor development. It is assumed that HC inactivates precursors of suppressor lymphocytes whereas the mature suppressor cells themselves are HC-resistant. (b) The increased resistance against the tumor could be partially re-suppressed by restoring the HC-treated TBM with spleen or thymus cells from normal C57BL. Suppression, however, was more pronounced if the resistant mice were restored with spleen or thymus cells from TBM. HC-resistant spleen cells from TBM that appear to be enriched for mature suppressor cells were capable of suppressing in vitro the secondary sensitization of spleen cells from TBM against tumor cells.