In this paper we consider the classical problem of dividing a land among many agents so that everybody is satisfied with the parcel she receives. In the literature, it is usually assumed that all the agents are endowed with cardinally comparable, additive, and monotone utility functions. In many economic and political situations violations of these assumptions may arise. We show how a family of...

1. Definitions 1.1. Types of Aridity 1.2. Levels of Aridity 2. Paleoperspective 3. People and Land Use in Arid Lands 3.1. Foragers/Hunter–gatherers 3.2. Agriculturists 3.3. Pastoralists 4. Geomorphology of Arid and Semiarid Lands 5. Biological Diversity in Arid Lands 5.1. Arid and Semiarid Lands Plants and their Uses 5.2. The Future of the Conservation of Wild Plants in Arid Regions 6. Climatic...

We consider whether current notions about superstring theory below the Planck scale are compatible with cosmology. We find that the anticipated form for the dilaton interaction creates a serious roadblock for inflation and makes it unlikely that the universe ever reaches a state with zero cosmological constant and time-independent gravitational constant. Superstring theories have been extensive...

The objective of this work is to carry out a comparative study between irrigated and rain-fed olive farms in arid area, Zarzis belonging Southern Tunisia. In order achieve objective, survey was carried on nearly 30 farms: 13 are the lands 17 dry areas. As first step, we proceeded through socio-economic, technical environmental assessment determine characteristics each type farms. second part, t...

Executive summary: We scrutinized peer-reviewed literature, technical books, and key reports in order to detect any evidence for a differential ability between public and public lands to protect imperiled species in the United States. Limitations in data availability and/or in study scale limited our comparison mostly to certain contrasts of federal public versus mostly private lands. At a nati...

nowadays, population growth and on the other hand resources limitations astonish authorities. population changes cause variation in economic activities and land use changes. as a whole, overusing, improper land use and human disturbances over natural resources make environmental imbalances worse. in recent decades, we have seen land use changes in taleghan basin. land use changes were produced ...

Twenty lactating Ossimi ewes were randomly distributed according to weight and their average milk yield into 4 groups, (5 each). One group fed berseem hay (BH) (Triforum alxanderinum); the second fed, quinoa (QH);  third corn silage(CS), while fourth was  fed silage (QS). All groups offered similar amounts of barley grains (500 g/h/d) as concentrate feed, or ad lib. Results showed that characte...