Articles
-
Accumulation and toxicity of monophenyl arsenicals in rat endothelial cells
Clark 1 (diphenylarsine chloride) and Clark 2 (diphenylarsine cyanide) were used as chemical weapon agents (CWA), and the soil contamination by these CWA and their degraded products, diphenyl and phenyl arsenicals, has been one of the most serious environmental issues. In a series of comparisons in toxicity between trivalent and pentavalent arsenicals we investigated differences in the ...
-
Sources of Nitrate in Snowmelt Discharge: Evidence From Water Chemistry and Stable Isotopes of Nitrate
To determine whether NO3−, concentration pulses in surface water in early spring snowmelt discharge are due to atmospheric NO3−,, we analyzed stream δ,15N-NO3−, and δ,18O-NO3−, values between February and June of 2001 and 2002 and compared them to those of throughfall, bulk precipitation, snow, and groundwater. Stream total Al, DOC and Si concentrations were used ...
-
Intraspecific Genetic Diversity of Undaria pinnatifida in Japan, based on the Mitochondrial cox3 Gene and the ITS1 of nrDNA
The intraspecific genetic diversity of the kelp Undaria pinnatifida (Harvey) Suringar (Laminariales, Phaeophyceae) was investigated using DNA sequences of the mitochondrial cytochrome oxidase subunit 3 (cox3) gene and internal transcribed spacer 1 (ITS1) of nuclear ribosomal DNA in plants collected from 21 localities along the Japanese coast between 2001 and 2003. Morphological variation was also ...
-
The use of the Pareto distribution for fracture transmissivity assessment
For many applications data on the transmissivity distribution of individual fractures are necessary, i.e., discrete fracture network (DFN) modelling of groundwater flow and transport of solutes in fractured rock and design and performance of rock grouting. Using borehole data from the Äspö Hard Rock Laboratory, Sweden, it is shown that evaluated fracture transmissivities from three boreholes at ...
-
Applicability of the most frequent value method in groundwater modeling
The Most Frequent Value Method (MFV) is applied to groundwater modeling as a robust and effective geostatistical method. The Most Frequent Value method is theoretically derived from the minimization of the information loss called the I-divergence. The MFV algorithm is then coupled with global optimization (Very Fast Simulated Annealing) to provide a powerful method for solving the inverse ...
-
Assessing selected natural and anthropogenic impacts on freshwater lens morphology on small barrier Islands: Dog Island and St. George Island, Florida, USA
The freshwater lens morphologies of the barrier islands Dog Island and St. George Island on the panhandle coast of Florida (FL), USA, are controlled to varying degrees by both natural and anthropogenic factors. Variable-density groundwater flow models confirm that spatial variability of recharge values can account for the observed lens asymmetry on these islands. The depth to the base of the lens ...
-
On the consideration of mesoscale transports in climate modelling
The dynamical effect of land surface heterogeneity on heat fluxes in the atmospheric boundary layer (ABL) is investigated using numerical simulations with a nonhydrostatic model over a wide range of grid resolutions. It is commonly assumed that mesoscale or dynamical fluxes associated with mesoscale and convective circulations simulated by a high-resolution model (subgrid (SG) model) on the ...
-
Per Capita Carbon Dioxide Emissions: Convergence or Divergence?
Understanding and considering the distribution of per capita carbon dioxide (CO2) emissions is important in designing international climate change proposals and incentives for participation. I evaluate historic international emissions distributions and forecast future distributions to assess whether per capita emissions have been converging or will converge. I find evidence of convergence among ...
-
Geostatistical Analysis for Hydrogeochemical Characterization of the Han River, Korea: Identification of Major Factors Governing Water Chemistry
The Han River is the largest river in South Korea in terms of its length, drainage and mean annual discharge. The river is of importance for cultural and economic reasos because it is a unique source of drinking water for more than 20 million people living in Seoul and its surrounding areas. Intensive industrial development in Seoul during the last four decades has greatly increased the risk for ...
-
Emission predictions with a multi-linear reservoir model
ABSTRACTFor the assessment of combined sewer overflows detailed models are not necessary. Physically based conceptual models give an optimal balance between model uncertainty and uncertainty in the input data. Besides, it is important that continuous long term simulations are performed. To prove this, in this paper the calibration of a reservoir model is discussed. The emission results of the ...
-
Mop Water Treatability
The samples were tested at our facility on Thursday, March 20, 2003. Visually the samples were a homogeneous mixture of mop water, oil, and metals. The initial pH was 10.5 and the conductivity was 7,500 μS.The sample was ozonated at a setting of 35% of capacity (35% of 3.9 gm/hour) or 1.37 gm/hour in the stabilization column for 12 hours. There appeared to be very little separation of oils ...
-
Pipeline integrity rule
Historically, transportation of oil and gas by pipelines remains the safest and most economical mode compared to other modes. However, pipeline integrity does cause a concern to the public and environment along the pipeline route because of its ever presence at the location for its entire useful life. U.S. pipeline failure incidents in the late ’90s accelerated the process of mandating pipeline ...
-
Classification of contaminants and treatability evaluation of domestic wastewater
Long-term sampling and analysis were conducted in a domestic wastewater treatment plant for the investigation on the characteristics of the representative contaminants in raw sewage such as SS, COD, BOD5, TP, and TN. All these constituents were classified into dissolved and suspended groups by using a 0.45-μm membrane filter, and the concentration of each constituent in each group was ...
-
Numerical modelling of the environmental impact of landfill leachate leakage on groundwater quality – a field application
Waste disposal facilities are mainly responsible for the gradual quality degradation of subsurface freshwater reservoirs. The main objective of this work is to identify the groundwater contamination risk due to potential leachate leakage and seepage beneath the municipal landfill of the City of Patras in Greece. A groundwater and leachate mass transport model of the underlying aquifer was ...
-
Talking Trash
In 1976, Brent Sebright and his colleague, Lee Murray, formed a small operation in Hopkins Michigan installing trash compacting equipment manufactured by another company. By 1980, the manufacturer was experiencing financialtroubles, and its largest customer, Brask Enterprises, a trash compactor rental company, had become dissatisfied. “We got a phone call from the president of Brask Enterprises ...
-
Influence of some meteorological parameters and forest fires on PM10 concentrations in a southwest zone of Mexico Valley
The relationship between PM10 concentrations and some meteorological parameters was analysed. Sampling was made from January (1998) to June (2001) in the campus of the National Autonomous University of Mexico (UNAM) at the southwestern part of the Mexico Valley. Year 1998 had extensive forest fires. A linear multivariate model was constructed. The model's adequacy to extrapolate daily average ...
-
The right to work versus the right to income
Since the mid-1970s, restrictive monetary and fiscal policy have led to persistently high unemployment and rising underemployment in Australia. This paper compares two policy responses to income insecurity resulting from these trends, in the form of a universal Basic Income (BI) and a state-provided Job Guarantee (JG). The paper examines how the problem of income insecurity is constructed in each ...
-
EPA’s proposal to revise the air quality standards for ground-level ozone
OnJune 20, 2007, the U.S. Environmental Protection Agency (EPA) proposed to strengthen the nation’s air quality standards for ground-level ozone. Recent scientific literature has improved our understanding of the adverse effects of ozone on both human health and the environment. This article summarizes the latest scientific knowledge on the effects of ozone and the key aspects of EPA’s proposal ...
-
A triple bottom line opportunity for our cities
The triple bottom line for capital project delivery means the integration of financial, environmental and social objectives for a sustainable outcome. We’re talking about the very core of how a private sector company conducts its own business and how it works with its client to find a balance of solutions to their capital project delivery, financing and ongoing operations. This represents a ...
-
ESFR Sprinkler Protection of Class II Commodity in Cold Storage Warehouses using Propylene Glycol Antifreeze Agent
Currently, the NFPA standard for the installation of sprinkler systems (NFPA 13) requires that early suppression fast response (ESFR) sprinklers be specifically listed for use with antifreeze mixtures due to the concern that antifreeze will contribute to the combustion energy of the fire. The effectiveness of an ESFR sprinkler system in suppressing a fire depends on the antifreeze concentration, ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you