the manning roughness coefficient is an important parameter in the design and evaluation of furrow irrigation. despite its importance, estimation of this parameter for surface irrigation is very difficult, particularly in furrow irrigation. in this study, an evalue model was used to estimate the manning roughness coefficient in furrow irrigation. the model was based on volume balance and develo...

Chemical extractants used to measure labile soil metal must ideally select for and solubilise the labile fraction, with minimal solubilisation of non-labile metal. We assessed four extractants (0.43 M HNO3, 0.43 M CH3COOH, 0.05 M Na2H2EDTA and 1 M CaCl2) against these requirements. For soils contaminated by contrasting sources, we compared isotopically exchangeable Ni, Cu, Zn, Cd and Pb (EValue...

Speed and availability of information, delivered in past years by Internet technologies, made it easier for any company to outsource primary activities, which resulted in unbundling of many companies’ traditional value constellations into networks of different companies. In the electricity power sector decomposition of the value constellation is not only enabled by technological advances such a...

This paper explores issues of eValue creation within communities joined through the Web, and the implications on end user acceptance of pervasive information and communication technology (ICT). We draw on developments in several streams of research on network economics in order to understand the changed logic of value creation on the Web, and its implications on the moderators of user acceptanc...

Over the years, research on software architecture has identified architectural styles. In this paper we consider five of such styles, and analyze whether these styles can also be found in business value models for networked enterprises. To this end, we analyze 17 evalue models, as discussed in 29 academic papers or book chapters. We also consider whether the quality attributes related to the so...

A first step in developing eBusiness ideas is to understand such an idea thoroughly. In the recent past, industry has clearly demonstrated that such an understanding lacks or at least is insufficient, resulting in failures and sometimes even bankruptcies. In this chapter we present an approach to design an eBusiness model, called the evalue approach. This approach is ontologically founded in bu...

This paper takes stock of an ongoing language merging experiment on value-based componential language engineering. In line with earlier work, we discuss that conceptual modelling languages can be perceived from a value perspective, and that doing so opens up the possibility of “model bundling”. This means that we unbundle languages into valuable constituent parts, and subsequently mix-and-match...