This paper establishes the consequences of a wrong specification on the quality of the data envelopment analysis. Specifically, the case of omitting a relevant variable in the input oriented problem is analyzed when there are different correlation structures between the inputs. It is established that the correlation matrix gives relevant information about the homogeneity of the decision making ...

The estimation of education production models used to evaluate the effect of school inputs and past skills on test scores, often called value-added models, can be biased by three main econometric issues: unobserved child characteristics, unobserved family and school characteristics and measurement error. We propose a two-step estimation technique which exploits the availability of test scores a...

Background & Aims of the Study: Increasing hazardous industrial wastes and lack of necessary regulations for management of them have led to serious problems in some parts of Iran. The aim of this study was to evaluate the situation of collection, transportation, recycling, and disposal of hazardous industrial wastes in the Khazra Industrial Park of Kerman, Iran. Materials & Meth...

The cover feature image shows the industrial production of nanosheets. First, ingredients are poured into continuously stirred tank reactor. reacted solution is separated at next tank. suspension nanosheets centrifuged, and obtained packed vessels as concentrated suspensions. practical use requires development a facile versatile synthesis method controlling size low cost to be scaled up. More i...

Discarded dried button, dried oyster, and fresh button mushroom beds were examined for their bioactive compounds and industrial enzymes. Levels of reducing sugars and total sugars were high in all mushroom beds. Carboxymethyl cellulase activity was higher (920 μg/mL) in the dried oyster mushroom bed extract. Schizophyllum commune, Fomitopsis feei, Trametes gibbosa, and Trametes elegans were gro...

Submit Manuscript | http://medcraveonline.com The global human population increased from 1.6 billion to six billion during the 20th century and is estimated to reach 10 billion by 2050. Producing sufficient food to feed rapidly growing human population is one of the biggest challenges the world is ever facing in modern history. For decades, agriculture has been heavily reliant on industrial nit...

This paper discusses the authors' experiences in re-engineering and subsequently refining part of a Z-style specification of the Graphics Kernel System using the Abstract Machine Notation as supported in the B Toolkit. 1 I n t r o d u c t i o n "B User Trials" is a collaborative project between Lloyd's Register, Rutherford Appleton Laboratory, Program Validation Limited and the Royal Military C...