Contribution of associated trees to long-term species conservation,carbon storage and sustainability: a functional analysis of tree communities in cacao plantations of Central Cameroon

In Central Africa, most cacao is still cultivated in low-input agroforests where cacao associated trees are traditionally valued by farmers. These systems are sustainable on the long run, support biodiversity conservation and carbon storage. Yet, little knowledge exists on the contribution of tree community management to explain such results. In Central Cameroon, we investigated cacao agroforest associated tree community contributions to the long-term (i) maintenance of tree species encountering a conservation issue and (ii) carbon storage. We further simulated the simplification of these systems by checking for the effect of tree density decrease on community functional groups or traits. Finally, we linked farmers’ use of associated trees to their functional features and conservation status. Cacao agroforestry systems were able to combine high levels of species richness with long-term conservation abilities and carbon storage. Simplification emphasized consistent shifts of functional traits/groups that will change the way they function and alter the existing balances between different associated tree uses. Since traditional agroforests are now foreseen as providers of timber/non-timber forest products, our study argues that this paradigm change in such low-input systems - if carried improperly - is likely to impair the provision of the services they currently provide as well as their sustainability.     

Identifying The Demand For Features: An Application To Mainframe Computers

This paper examines the mainframe computer market from 1985–1991 and attempts to identify the types of buyers that demand particular computer features, such as speed and memory. To identify these buyers, demand for computer characteristics is estimated using a demand model based on Rosen (1974). Through these demand estimates we are able to show that the advent of on-line transactions processing was pushing the demand for computer speed and memory to some extent. However, beyond this specialized application, only a few industries seemed to be demanding the newest technology, while the majority of buyers continued to buy small mainframes throughout the sample period.     

Multiple Discourses on Crisis: Farm, Agricultural, and Rural Policy Implications

The terms farm crisis, agricultural crisis, and rural crisis have been invoked in political and policy discourse to characterize significant disruptions in or threats to rural–farm livelihoods. Although these expressions reflect a general sense of concern over the state of agriculture and rural existence, they lack clear and concise meaning. Academic research and policy development are obfuscated by the lack of definitional consensus or, at minimum, some shared understanding of the core aspects of farm‐related crisis. Much of the debate revolves around four main themes: farm financial difficulties (low or unstable incomes, indebtedness, and increasing reliance on nonfarm revenue), structural changes in agriculture (increasing scale, concentration, and consolidation), rural livelihoods (dwindling communities, institutions, and services), and international dimensions (market fluctuations, trade regulations, and disputes). The examination of these interrelated levels of analysis offers a valuable framework for interpreting the multifold contexts, meanings, and responses to crisis. This paper explores varied representations of farm–agricultural crisis, with particular emphasis on the presumed causes (or precipitating factors), conditions, and related policies and programs. Les expressions ? crise agricole ? et ? crise rurale ? sont évoquées dans le discours politique pour caractériser des perturbations ou des menaces importantes aux moyens de subsistance en milieu rural et agricole. Bien que ces expressions traduisent certaines inquiétudes concernant la situation des secteurs agricole et rural, leur signification manque de clarté et de concision. Les chercheurs universitaires et les élaborateurs de politiques sont déconcertés par le manque de consensus définitionnel ou, du moins, par le manque de vision commune des aspects fondamentaux de la crise agricole. Une grande partie du débat tourne autour de quatre thèmes principaux: les difficultés financières de l’exploitation agricole (revenu faible ou instable, endettement et dépendance accrue aux revenus non agricoles); les changements structurels dans le secteur agricole (augmentation de l’échelle de production, concentration et regroupement); les moyens de subsistance en milieu rural (diminution du nombre de collectivités, d’institutions et de services); les dimensions internationales (fluctuations du marché, règlements concernant les échanges commerciaux, différends). L’examen de ces niveaux d’analyse interreliés offre un outil précieux pour interpréter les multiples contextes, significations et réactions aux crises. Le présent article analyse les diverses représentations de la crise dans le secteur agricole et se penche particulièrement sur les causes présumées (ou facteurs déclenchants), les conditions ainsi que les politiques et programmes connexes.     

Measuring performance of knowledge‐intensive workgroups through social networks

In this article, we examine the effect of social network position, structure, and ties on the performance of knowledge‐intensive workers in dispersed occupational communities. Using structural holes and strength‐of‐tie theory, we develop a theoretical framework and a valid and reliable survey instrument. Second, we apply network and structural holes measures for understanding its association with performance. Empirical results suggest that degree centrality in a knowledge workers' professional network positively influences performance use, whereas a highly constrained professional network is detrimental to performance. The findings show that social network structure and position are important factors to consider for individual performance.     

An examination of measurement context effects in empirically based advertising research

The purpose of this research was to examine the issue of measurement context effects in advertising processing research. Based upon a review of the advertising processing literature and recent research focusingon measurement contexteffects, hypotheses were specified and empirically tested via a measurement context experiment. The results indicate that the cognitions measurement treatment procedures used in advertisement processing model tests produce small measurement context effects. However, these effects are not sufficiently severe to suggest a reinterpretation of previous findings or to result in drastic changes in future advertisement processing research methods. The results suggest the process of measuring respondents' attitudes towards advertisements did not result in statistically significant measurement context effects on the measures of attitudes towards brands or purchase intentions.     

Just‐in‐time as a competitive weapon: The significance of functional integration

The Just‐in‐Time (JIT) concept has often been considered a preserve of manufacturing and distribution. However, the philosophy has evolved to a strategic level where the concept can be applied throughout an organization. In particular, the cross‐functional integration of JIT in production, purchasing and marketing can provide continuous improvement and sustain a source of differential advantage for a firm.

This paper explores this philosophy and presents research data to demonstrate that the functional integration needed to implement JIT can improve a company's efficiency, quality, flexibility and innovativeness. and lead potentially to the acquisition of competitive advantage and, perhaps, to world‐class status.