منابع مشابه
Spring cleaning: rural water impacts, valuation, and property rights institutions.
Using a randomized evaluation in Kenya, we measure health impacts of spring protection, an investment that improves source water quality. We also estimate households' valuation of spring protection and simulate the welfare impacts of alternatives to the current system of common property rights in water, which limits incentives for private investment. Spring infrastructure investments reduce fec...
متن کاملSpring cleaning as a safety risk: results of a population-based study in two consecutive years
BACKGROUND Spring cleaning is a popular tradition in Iran as well as in many other countries. The purpose of our study was to determine the pattern and compare the incidence of spring cleaning related injuries in Tehran, in the years 2007 and 2008. METHODS In the year 2007, a household survey was performed in Tehran by random cluster sampling. The survey was repeated in May 2008 with the same...
متن کاملSpring Cleaning and Grammar Compression: Two Techniques for Detection of Redundancy in HPSG Grammars
This paper presents two approaches that identify which parts of an implemented grammar are used and which parts are computationally inactive. Our results lead to the following insights: even small grammars contain noise due to revised analyses, removing superfluous types from a grammar may help to detect errors in the original grammar and at least half of the types defined in the grammars we in...
متن کاملSpring-cleaning of African agathidines: new combinations for five species previously placed in Cremnops Förster (Hymenoptera: Braconidae).
Little work has been done with the African species of Cremnops since their original descriptions. Herein we propose new combinations for five species that are currently placed in Cremnops, i.e., C. atripennis Szépligeti 1914 and C. elegantissima Szépligeti 1908 are moved to Disophrys; C. borealis (Szépligeti 1914) and C. rubrigaster Masi 1944 are moved to Biroia; and C. pulchripennis Szépligeti...
متن کاملDry Cleaning
It has been more than a century since dry cleaning had its origin in Paris, France. Since that time, the dry cleaning process, whereby garments are cleaned in a nonaqueous solvent, has witnessed many refinements. Gasoline and carbon tetrachloride have been replaced as dry cleaning fluids by perchloroethylene (perc, and also known as tetrachloroethylene), Stoddard solvent (a petroleum distillate...
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ژورنال
عنوان ژورنال: The Iowa Review
سال: 1973
ISSN: 0021-065X,2330-0361
DOI: 10.17077/0021-065x.1684