Search results

Credit cards are now widely accepted by the public, and in recent years some retailers have introduced their own. This secures customer loyalty, but can be a costly system to administer. MCS have developed a new service designed to overcome operational problems and to help retailers promote their own credit card systems.

This paper aims to elucidate the geochemical characteristics of the hydrothermally altered rocks with gold mineralization and the elemental transfers in hydrothermal alteration hosted in alkaline complex in Hongshan area, Taihang Orogen, North China, and preliminarily discuss the relationship between the gold mineralization and the hydrothermal alteration.

Based on detailed field investigation, sampling and petrographical observation, major oxides and trace elements of nine rock samples are analyzed, and the method of mass balance equation is used in calculation of the elemental transfer.

Three alteration stages in the Hongshan area are identified, which are the early, main and late alterations. The early one is characteristic of extensive pyritization in the complex, which is related to the mantle-derived magmas and occurs before gold mineralization. The main one is characterized by developing a great deal of altered rock in fracture zones with the gain of many elements and the loss of a few elements. The late one is dominated by limonitization, that is limonite replacing the early pyrite or Fe₂O₃ replacing FeO in rocks. In the main alteration, the altered rocks obviously gain fluid component (LOI, i.e. loss on ignition) and elements such as V, As, Rb, Au, La, Ce and Nd and total rare earth elements (REEs). Elements such as K, Fe, Cu, Zn, Y, Mo, Sb, W, Re and U are gained in some altered rocks. Na and Sr are lost in all altered rocks, and Th and Bi are lost in some ones in the meantime. The following elements: Si, Mg, Mn, Ca, Li, Sc, Cr, Co, Ni, Zr, Ag, Ba and Hg show either gain or loss in different altered rocks. Au is notably enriched in the hydrothermal alteration. The elemental gain or loss in the altered rocks indicates that the main mineralization develops extensive de-alkalinization, local potassic metasomatism, silicification or desilicification.

The properties of materials under impact load are introduced in terms of metal, nonmetallic materials and composite materials. And the application of impact load research in biological fields is also mentioned. The current hot research topics and achievements in this field are summarized. In addition, some problems in theoretical modeling and testing of the mechanical properties of materials are discussed.

The situation of materials under impact load is of great significance to show the mechanical performance. The performance of various materials under impact load is different, and there are many research methods. It is affected by some kinds of factors, such as the temperature, the gap and the speed of load.

The research on mechanical properties of materials under impact load has the characteristics as fellow. It is difficult to build the theoretical model, verify by experiment and analyze the data accumulation.

This review provides a reference for further study of material properties.

This chapter explores the relation between personal well-being – measured with life satisfaction – and intergenerational mobility in Spain (2017). We start by applying machine learning techniques to overcome traditional data limitations and estimate intergenerational income mobility. Then, by means of several econometric specifications, we find the relation between personal well-being and intergenerational income mobility to be non-significant. This result is robust to several measures of educational and occupational mobility. Contrary to the comparison theory, if Spanish citizens derive well-being benefits or losses from intergenerational mobility, these effects are not permanent and dissipate with time. We find other variables, such as enjoying good health, higher income levels and marriage, to be positively associated with life satisfaction. Overall, personal well-being in Spain is more related to materialistic aspects rather than to the comparison of individuals’ current position against the previous generations’ socio-economic status.

This study aims to investigate the relationship between a positive leadership style [i.e. authentic leadership (AL)] and nurses’ psychological health (i.e. nurses’ flourishing and satisfaction with work–family balance), including psychological capital (PsyCap) as a mediational variable.

A cross-sectional study was conducted with a self-report questionnaire including 1,076 nurses from public and private hospitals in France.

Structural equation modeling results revealed that AL is related to nurses’ flourishing and satisfaction with work–family balance and that PsyCap acted as a partial mediator between this leadership style and positive outcomes.

This research indicated that hospitals can enhance nurses’ psychological health not only in their work but also in their lives in general by improving leaders’ authentic management style and developing PsyCap (e.g. staffing, training and development).

An original feature of this paper concerns its focus on the mediating role of PsyCap in the relationship between AL and these positive outcomes. Moreover, this study underlined the influence of leadership style on nurses’ psychological health beyond occupational health. The research makes a valuable contribution to the existing AL literature by establishing a new explanatory model of AL and nurses’ psychological health in the French context. It also highlights the interest in developing this leadership style in health-care settings.

Some women who left situations of exploitation falling under the umbrella term of modern slavery in the United Kingdom (UK) are mothers whom I calls survivor mothers in this chapter. Some are determined agents driven to provide better lives for their children. In their journeys after exploitation, they may draw resilience from various resources such as children and survivor communities. The findings in this chapter are based on data collected as part of a broader research project focussing on women’s journeys after exiting exploitation in the UK. Through decolonial feminist methods using a narrative analysis of semi-structured interviews with survivor mothers, I have examined children and survivor communities as resources of resilience in tandem with the structural violence that harms survivor mothers’ capabilities of remodelling life after exploitation. At the same time, I recognise that vulnerability caused by structural violence can drive resistance. By way of resistance, some survivor mothers assert agency. Additionally, I criticise the reductive use of resilience as it often ignores complex structural factors. I conclude that it is impossible to employ resilience uncritically in life after exploitation.

This study examines whether learning climate relates to employability competences through social informal learning (i.e. feedback, help and information seeking).

Multiple regression analyses and structural equation modeling were used to test direct and indirect effects in a sample of 372 employees working in two Dutch governmental institutes.

The analyses confirmed that learning climate has an indirect effect on employability competences through feedback, help and information seeking. More specifically, the findings suggest that learning climate is important for employees' engagement in proactive social informal learning activities. Engaging in these learning activities, in turn, relates to a higher level of employability.

This study employs an integrative approach to understanding employability by including the organization's learning climate and employees' social informal learning behavior. It contributes to the extant literature on professional development by unraveling how proactive social informal learning relates to employability competences. It also provides new insights on learning climate as a determinant for social informal learning and employability.

Surveying hard-to-reach groups is difficult but necessary to prevent selection effects and biased sampling. Their diversity makes it difficult to recommend efficient solutions because they bring challenges that are specific to each group. Among these are limited ability in official languages, literacy problems, physical or mental disabilities or the particularities of subgroups such as ethnic, religious and cultural minorities, adolescents and the elderly. Drawing notably on lessons from migration research, this paper reviews the contemporary issues associated with five sets of circumstances that may result in groups being unreached by transport surveys.

A new way of solving the steady‐state coupled radiative‐conductive problem in semi‐transparent media is proposed. An angular discretization technique is applied in order to express the radiative transfer equation (RTE) in an inhomogeneous system of linear differential equations associated with Dirichlet boundary conditions. The system is solved by a direct method, after diagonalizing the characteristic matrix of the medium. The RTE is coupled with the nonlinear heat conduction equation. A simulation of a real semi‐transparent medium composed of silica fibers is illustrated. Comparison with results of other methods validates the new model. Moreover, the general scheme is easy to code and fast. The algorithm proved to be robust and stable.

To some persons, private gardens, public parks, and farms appear to offer a safe way to preserve all of the plants and animals the environment needs. To people who ignore the need for conservation, the idea of paving and pruning and artificially laying out our land from coast to coast seems welcome. Wiser persons perceive that the destruction so imposed on nature would ultimately endanger our existence. The wilderness, with its wealth of animals and plants, holds a treasure from which we already extract the chemicals and genes we need for agricultural breeding, for industrial products, and for healing drugs. What to the layman may look like a disorderly swamp, or a dark forest, or an uninteresting prairie, actually encompasses complicated communities of vegetation and animals of all classes, communities that are held together in a stable balance by their interdependent components. Ecologists are identifying the key principles at work in these ecosystems of wetlands and drylands, forests and prairies. In their search for understanding of how life on our planet functions, they have called attention to the overriding need to preserve and protect the biological diversity that characterizes ecosystems. They have found instances in which short‐sighted human tampering has played havoc with subtle ecological balances. Too frequently entire species have vanished under man's onslaught. Sometimes such a disappearance is an indication that an entire ecosystem is out of balance.