In DELPHI Volume IV, Chapter 3 (1993) it was argued that by making assumptions about the propagation behavior of a synthesized (plane) wave through a weathered layer it is possible to consider the weathered layer effects at the source and receiver side separately. The fast weathered layer distortion to the (plane) wave front at the source side is largely restored during propagation through the ...

In view of the current situation shortage alkaline aggregate and abundance weakly acidic weathered igneous rocks around Nairobi, Kenya, in order to fully improve adhesion performance asphalt rocks, this paper studies effects different anti-stripping agents separately combined on aggregates. The results show that agent can property medium rock asphalt, effect is better when combined.

Meteoric waters move along pathways in the subsurface that differ as a function of lithology because effects chemical and physical weathering. To explore how this affects stream chemistry, we investigated watersheds around an igneous intrusion Luquillo Mountains (Puerto Rico). We analyzed streams on 1) unmetamorphosed country rock (volcaniclastic sedimentary strata, VC) surrounding intrusion, 2...

Ammonia oxidizing archaea (AOA) and bacteria (AOB) drive nitrification and their population dynamics impact directly on the global nitrogen cycle. AOA predominate in the majority of soils but an increasing number of studies have found that nitrification is largely attributed to AOB. The reasons for this remain poorly understood. Here, amoA gene abundance was used to study the distribution of AO...

Different batches of weathered basalt ranging from 100 to 50 %, in combination with by-pass cement dust, were used prepare the glass compositions. techniques utilized such as differential thermal analysis, X-ray diffraction, density, FTIR, mass attenuation coefficients, appropriate atomic number (Zeff), and effective electron density (Neff), examined for prepared glass-ceramics samples at diffe...

Evaluation of the excavation-induced ground movements is an important design aspect of supporting system in urban areas. This evaluation process is more critical to the old buildings or sensitive structures which exist in the excavation-affected zone. Frame distortion and crack generation are predictor, of building damage resulted from excavation-induced ground movements, which pose challenges ...

This study used the efficiency of electrical resistivity tomography (ERT) and borehole logs to map soil-rock interface beneath four traverses (RS1, RS2, RS3, RS4) in granitic terrain Perak, Peninsular Malaysia. The aimed evaluate impacts characteristic features interfaces on groundwater infrastructure development meet needs increasing inhabitants yearly. borehole- ERT-derived lithologic units a...