Long-Term Field Studies of a Rodent Population Continuously Exposed to TCDD

1983 ◽  
pp. 357-372 ◽  
Author(s):  
C. E. Thalken ◽  
A. L. Young
Keyword(s):  
Field Studies ◽  
Rodent Population ◽  
Term Field

scholarly journals A synopsis of long-term field studies of mammals: achievements, future directions, and some advice

2017 ◽  
Vol 98 (3) ◽  
pp. 670-677 ◽  
Author(s):  
Carsten Schradin ◽  
Loren D. Hayes
Keyword(s):  
Field Studies ◽  
Future Directions ◽  
Term Field

Long-Term Field Aging of Warm-Mix and Hot-Mix Asphalt Binders

2017 ◽  
Vol 2632 (1) ◽  
pp. 140-149 ◽  
Author(s):  
Weiguang Zhang ◽  
Shihui Shen ◽  
Shenghua Wu ◽  
Louay N. Mohammad
Keyword(s):  
High Temperature ◽  
Prediction Model ◽  
Hot Mix Asphalt ◽  
Field Studies ◽  
Asphalt Binders ◽  
Climate Effect ◽  
Air Voids ◽  
Multiple Parameters ◽  
Term Field

Limited field studies have considered the aging of warm-mix asphalt (WMA) binders, especially from the perspective of long-term aging. This paper quantifies the long-term (10 to 82 months) field aging properties of WMA binders and the control hot-mix asphalt (HMA) binders and identifies the key factors associated with long-term field aging of asphalt. Asphalt binders from 23 field projects consisting of 65 HMA and WMA pavements were recovered, and high-temperature performance grade (PG) was tested. The effects of climate, month of aging, WMA technologies, and original binder high-temperature PG on field asphalt aging were analyzed. A prediction model that included multiple parameters was developed and validated. Results indicated that Evotherm WMA binder had a lower high-temperature PG than HMA binder shortly after construction, but this difference reduced with time. No statistical difference of field aging between HMA and WMA binders was observed. The climate effect on asphalt field aging was apparent within dry areas or freeze areas, whereas the aging difference between dry and freeze areas was inconclusive and requires further research. Other conclusions were that ( a) the field asphalt aging affects more of top-down longitudinal wheelpath crack than transverse crack, ( b) foaming WMA binder ages slowest of all binders considered, ( c) PG 64-XX and PG 70-XX binders aged more than PG 58-XX and PG 76-XX binders, and ( d) the prediction model had good agreement with test results and was well validated. The identified factors that affected field asphalt aging were overlay thickness, in-place air voids, effective binder content, complex shear modulus, and solar radiation.

Long-Term Field Studies

BioScience ◽  
1979 ◽  
Vol 29 (12) ◽  
pp. 717-717 ◽  
Author(s):  
D. W. Tinkle
Keyword(s):  
Field Studies ◽  
Term Field

SPRING DURUM WHEAT: RESULTS OF LONG-TERM FIELD STUDIES OF THE COLLECTION IN TAMBOV PROVINCE

2019 ◽  
Author(s):  
O.A. Lyapunova ◽  
◽  
A.S. Andreeva ◽  
V.A. Loseva ◽  
◽  
...  
Keyword(s):  
Durum Wheat ◽  
Field Studies ◽  
Term Field
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