منابع مشابه
Darkness and depth in early Renaissance painting
Contrast has always been appreciated as a significant factor in image quality, but it is less widely recognized that it is a key factor in the representation of depth, solidity and three-dimensionality in images in general, and in paintings in particular. This aspect of contrast was a key factor in the introduction of oil paint as a painting medium at the beginning of the fifteenth century, as ...
متن کاملModelling pollination services across agricultural landscapes.
BACKGROUND AND AIMS Crop pollination by bees and other animals is an essential ecosystem service. Ensuring the maintenance of the service requires a full understanding of the contributions of landscape elements to pollinator populations and crop pollination. Here, the first quantitative model that predicts pollinator abundance on a landscape is described and tested. METHODS Using information ...
متن کاملDenitrification across landscapes and waterscapes: a synthesis.
Denitrification is a critical process regulating the removal of bioavailable nitrogen (N) from natural and human-altered systems. While it has been extensively studied in terrestrial, freshwater, and marine systems, there has been limited communication among denitrification scientists working in these individual systems. Here, we compare rates of denitrification and controlling factors across a...
متن کاملCardiovascular Disease Epidemics and Factors Contributing to the Early Onset of These Lesions
This article has no abstract
متن کاملPolitical hierarchies and landscapes of conflict across Africa
Almost all African states experience substantial and widespread political insecurity in a variety of forms. This analysis explains how relationships between groups and governments create incentives and disincentives for distinct forms of political violence to emerge. It argues that ethno-regional communities across Africa are situated within a power hierarchy that determines their relative impo...
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ژورنال
عنوان ژورنال: The Iowa Review
سال: 1990
ISSN: 0021-065X,2330-0361
DOI: 10.17077/0021-065x.3925