منابع مشابه
Formation of Fluvial Hanging Valleys: Theory and Simulation
Although only recently recognized, hanging tributary valleys in non-glacial landscapes are not uncommon in tectonically active regions. Standard river incision models do not allow for the formation of fluvial hanging valleys; these disequilibrium landforms present an opportunity to advance our understanding of river incision processes. In this work, we demonstrate that thresholds apparent in se...
متن کاملHanging valleys in fluvial systems: Controls on occurrence and implications for landscape evolution
[1] We document and characterize hanging valleys in a fluvially eroded landscape in eastern Taiwan. Our conceptual model for the initiation of hanging valleys builds on a recently proposed model of bedrock incision in which erosion actually becomes less efficient on very steep channel gradients. If a pulse of incision in the main stem outpaces the tributary response, the gradients at tributary ...
متن کاملThe Natural History of the Lakeland Sarcoma
Recently, we reported a new transplantable tu mor which we described as a sarcoma of undeter mined type (3). The tumor was observed in the pelvic lymph nodes of a 2-year old Sprague-Dawley (S-D) rat, the liver of which had been irradi ated with 4000 r of x-rays 1 year prior to death. The tumor encompassed the cervix and parts of both uteri. Subsequent microscopic study has shown that it origina...
متن کاملPrognostic factors in hanging injuries.
The objectives of this study were to review variable factors influencing outcomes in hanging and to identify prognostic factors related to outcomes. Forty-seven patients presented to our department. Eleven patients survived and 36 died. A significant difference in mean hanging time was observed between survivor (11.8 +/- 8.37 minutes) and nonsurvivor (50.81 +/- 61.9). In survivors, heartbeat wa...
متن کاملModelling photochemistry in alpine valleys
Road traffic is a serious problem in the Chamonix Valley, France: traffic, noise and above all air pollution worry the inhabitants. The big fire in the Mont-Blanc tunnel made it possible, in the framework of the POVA project (POllution in Alpine Valleys), to undertake measurement campaigns with and without heavy-vehicle traffic through the Chamonix and Maurienne valleys, towards Italy (before a...
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ژورنال
عنوان ژورنال: Science
سال: 1907
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.25.647.835