abstract this paper presents a quantitative account of vegetation–environmental factor relationships in arid rangelands. vegetation cover was recorded using braun-blanquet combined abundance-cover scale in each quadrat. within each quadrat, one profile was dug and soil samples being taken at 0-20cm and 20-100cm depths. under study physical-chemical characteristics included texture, lime, organi...

Social media have enjoyed a rapidly increasing adoption among users in recent years. Millions of users execute billions of actions (in form of tweets, messages, replies, likes, etc.) every day. The massive amount of social interactions online has contributed to the proliferation of social advertising. Alongside the interest in online and social advertising, Twitter has introduced several advert...

Für meine Familie " Although it may seem a paradox, all exact science is dominated by the idea of approximation. "

We investigate paid endorsement as a crowd-sourcing social advertising mechanism that allows advertisers to bypass publishers (e.g., Facebook) and recruit individual endorsers of their own choice at affordable prices. Specifically, we investigate (i) how incentives affect endorsers’ participation and effectiveness, (ii) what types of endorsers are most effective in generating online engagement ...

Abstract This paper presents a quantitative account of vegetation–environmental factor relationships in arid rangelands. Vegetation cover was recorded using Braun-Blanquet combined abundance-cover scale in each quadrat. Within each quadrat, one profile was dug and soil samples being taken at 0-20cm and 20-100cm depths. Under study physical-chemical characteristics included texture, lime, orga...

allen P10lern (samt den Exilanten auf Z10) – f ¨ ur alle Hilfsbereitschaft und die entspannte und freundschaftliche Zusammenarbeit (und die dazugehörigen Kaffeepausen) meiner Familie – f ¨ ur die uneingeschränkte Unterstützung in allen Lebenslagen