in order to investigate biodiversity and production of cultivated medicinal plants in agroecosystems of qazvin province, a study was conducted during year of 2011. interviews were carried out with farmers by using semi-structured questionnaire to obtain information regarding to biodiversity and medicinal plants production systems in main regions under cultivation of medicinal plants including f...

What may be called the problem of imputation, which is a central problem of economics, is that of determining how the end product of the industrial process, called consumption goods, comes to be distributed among the individuals or classes of individuals which make up the economic system. Corresponding to the classes of individuals are classes of goods, which may in particular be arranged as fo...

It is proved that edges of a graph G can be coloured using χ(G) + 2 colours so that any two adjacent vertices have distinct sets of colours of their incident edges. In the case of a bipartite graph three colours are sufficient.

Process capability analysis is designed to estimate the proportion of parts that do not meet engineering requirements in a stable production process. In this paper, we review and criticize the capability indices typically used in industry for this purpose, and propose a general multivariate Bayesian capability index which contains the conventional index as a limiting case. We further derive its...

Editor—We read with great interest the recent article by Petrun and Kamenik regarding the use of a bispectral index (BIS) monitor as a guide to induce anaesthesia using an infusion technique with propofol compared with etomidate. This infusion technique is a plausible concept because of the BIS monitoring. Infusion techniques using propofol were performed many years ago, dating back to 1983–7 w...

A multivariate quantitative data is often summarized into a general index as a weighted sum when each variate has a prescribed order. Although the sum of standardized scores is a sensible choice of index, it may have negative correlation with some of the variates. In this paper, a general index that has positive correlation with all the variates is constructed. The index is applied to study the...