abstract water pricing is a policy instrument for improving water efficiency, reducing water demand, management of the irrigation systems and recovering costs. the underlying principle of water pricing is that it should reflect the opportunity cost of water. in this study, parametric mathematical programming approache were used to estimate the willingness of farmers to pay for groundwater under...

We give a reformulation of a six-parameter family of coupled Painlevé VI systems with affine Weyl group symmetry of type D (1) 6 . We also study some Hamiltonian structures of this system. 0. Introduction In the present paper, we propose a 6-parameter family of four-dimensional coupled Painlevé VI systems with affine Weyl group symmetry of type D (1) 6 . Our differential system is equivalent to...

Water saving agricultural technologies are a potentially important but under utilized lever to conserve groundwater in India. Technologies like laser levelers have high private returns and lead to water savings, yet the adoption rates are not very high. In order to provide insight for the design of policies to promote adoption, we conducted a survey based study about factors that influence the ...

BACKGROUND This cross validation study examined the reliability of the Multidimensional Pain Inventory (MPI) and the stability of the Multidimensional Pain Inventory Classification System of the empirically derived subgroup classification obtained by cluster analysis in chronic musculoskeletal pain. Reliability of the German Multidimensional Pain Inventory was only examined once in the past in ...

Let X1, · · · , Xn and Y1, · · · , Yn be independent heterogeneous geometric random variables with parameters p1 ≤ · · · ≤ pn and q1 ≤ · · · ≤ qn, respectively. We prove that ∑k i=1Xi is larger than ∑k i=1 Yi, for k = 1, · · · , n, in mean residual life order if, and only if, the harmonic mean of p1, · · · , pk is smaller than the harmonic mean of q1, · · · , qk, for k = 1, · · · , n. In this w...

Understanding tree growth as a function of tree size is important for a multitude of ecological and management applications. Determining what limits growth is of central interest, and forest inventory permanent plots are an abundant source of long-term information but are highly complex. Observation error and multiple sources of shared variation (spatial plot effects, temporal repeated measures...

A WHO and UNICEF joint report states that in 2008, 884 million people lacked access to potable drinking water. A life-cycle approach to develop potable water systems may improve the sustainability for such systems, however, a review of the literature shows that such an approach has primarily been used for urban systems located in resourced countries. Although urbanization is increasing globally...

BACKGROUND The question of whether personality traits influence health has long been a focus for research and discussion. Therefore, this study was undertaken to examine possible associations between personality traits and mortality in women. METHODS A population-based sample of women aged 38, 46, 50 and 54 years at initial examination in 1968-69 was followed over the course of 40 years. At b...

Original scientific paper Inventory classification is a very important part of inventory control which represents the technique of operational research discipline. A systematic approach to the inventory control and classification may have a significant influence on company competitiveness. The paper describes the results obtained by investigating the application of neural networks in multiple c...