https://trid.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) https://trid.trb.org/Images/PageHeader-wTitle.jpg https://trid.trb.org/ https://trid.trb.org/View/2581842 Mon, 27 Apr 2026 15:01:26 GMT https://trid.trb.org/View/2581842 https://trid.trb.org/View/2688764 Mon, 13 Apr 2026 16:48:10 GMT https://trid.trb.org/View/2688764 https://trid.trb.org/View/1865411 Tue, 27 Jul 2021 16:00:13 GMT https://trid.trb.org/View/1865411 https://trid.trb.org/View/1856575 Wed, 30 Jun 2021 17:35:08 GMT https://trid.trb.org/View/1856575 https://trid.trb.org/View/1856574 Wed, 30 Jun 2021 17:35:08 GMT https://trid.trb.org/View/1856574 https://trid.trb.org/View/1594964 Wed, 01 May 2019 09:34:13 GMT https://trid.trb.org/View/1594964 https://trid.trb.org/View/1550504 20 m), and 3) distance from the road (lateral; 2, 6, and 20 m). Phenol oxidase and hydrolase (glucosidase, sulfatase, xylosidase, glucosaminidase, and phosphatase) enzyme activities were determined for each sample, in addition to water table depth, phenolic concentration, pH, and peat temperature. The average hydrolase activities in the fen were ~four times higher than in the bog. At the bog, the water table depth, phenolic concentration, pH and the activities of phenol oxidase, sulfatase, glucosidase, xylosidase and glucosaminidase were all significantly influenced by one or more road associated factors. The highest enzyme activities in the bog occurred on the downstream side of the road at plots located far from the culvert. In contrast, the flow of water in the fen was not perpendicular to the road. Consequently, no significant variations in water table depth, phenolic concentration, pH or enzyme activity were found with respect to road associated factors. Results indicate that road crossings in boreal peatlands can indirectly alter enzyme activities, likely as part of a causal chain following changes to hydrology and redox conditions. Two of six investigated enzymes had significantly higher activities in the road disturbed areas compared to undisturbed areas, suggesting ultimately that roads may enhance organic matter decomposition rates. However, adequate hydrologic connections through culverts and road construction parallel to the water flow can minimize the road-induced impacts.]]> Tue, 20 Nov 2018 10:24:05 GMT https://trid.trb.org/View/1550504 https://trid.trb.org/View/1507775 15 kg N/ha/y and 100kg Na+/ha/y within 33 m of the highway, for example, there was no significant difference in soil chemistry amongst sites. Plant community composition at sites within 80 m of the highway differed from sites located further from the road, but it is unclear whether differences were due to highway emissions or were a result of natural forest edge effects.]]> Tue, 29 May 2018 16:03:47 GMT https://trid.trb.org/View/1507775 https://trid.trb.org/View/1372219 Mon, 26 Oct 2015 09:12:16 GMT https://trid.trb.org/View/1372219 https://trid.trb.org/View/1278766 Fri, 06 Dec 2013 11:31:54 GMT https://trid.trb.org/View/1278766 https://trid.trb.org/View/1250184 = 3/8 in.) aggregates in the laboratory. Testing demonstrated that fines collected from the field were enriched in chemicals that when exposed to water decreased pH and resistivity and increased chloride or sulfate concentrations relative to the bulk rock. This phenomenon can bias traditional soil testing results and therefore the assessment of corrosion potential. In this report a more representative geochemical testing protocol is recommended. The rate of corrosion was primarily controlled by the chloride content developed from the geochemistry of the backfill and the rate was predicted from the measured conductivity, as well as a two-step corrosion model was determined for the MSE.]]> Tue, 14 May 2013 09:45:14 GMT https://trid.trb.org/View/1250184 https://trid.trb.org/View/1214563 Wed, 26 Sep 2012 08:57:35 GMT https://trid.trb.org/View/1214563 https://trid.trb.org/View/981981 Thu, 04 Nov 2010 16:01:42 GMT https://trid.trb.org/View/981981 https://trid.trb.org/View/864201 Thu, 24 Jul 2008 13:34:49 GMT https://trid.trb.org/View/864201 https://trid.trb.org/View/839163 Thu, 15 Nov 2007 10:32:06 GMT https://trid.trb.org/View/839163