laboratory data Articles

  • Use of principal component analysis in conjunction with soft computing methods for investigating total sediment load transferability from laboratory to field scale

    This study quantitatively investigates the generalization from laboratory scale to field scale using the soft computing (expert) and the empirical methods. Principal component analysis is utilized to form the input vector for the expert methods. Five main dimensionless parameters are used in the input vector of artificial neural networks (ANN), calibrated with laboratory data, to predict field ...


    By IWA Publishing

  • FORUM 2: Availability of experimental data for computer modelling

    Having stated the reasons for the importance of available quality field or laboratory data for computer modelling, the author calls readers' attention to the urgency of data availability.Keywords: computer modelling, data availability, model calibration, model verification, field experiments, laboratory ...


    By Inderscience Publishers

  • GP approach for critical submergence of intakes in open channel flows

    This technical paper presents the genetic programming (GP) approach to predict the critical submergence for horizontal intakes in open channel flow for different bottom clearances. Laboratory data from the literature for the critical submergence for a wide range of flow conditions were used for the development and testing of the proposed method. Froude number, Reynolds number, Weber number and ...


    By IWA Publishing

  • A Modified California Bearing Ratio Test for Granular Materials

    It is known that laboratory and field tests, under saturation conditions, yield different California Bearing Ratio (CBR) test values for granular material. This is due primarily to the higher laboratory strength of the specimen confined in a rigid cylinder. A laboratory procedure is outlined by which specimens are subjected to controlled lateral pressure. A formula is proposed for determining ...


    By ASTM International

  • Prediction of maximum scour depth around piers with debris accumulation using EPR, MT, and GEP models

    Pier scour phenomena in the presence of debris accumulation have attracted the attention of engineers to present a precise prediction of the local scour depth. Most experimental studies of pier scour depth with debris accumulation have been performed to find an accurate formula to predict the local scour depth. However, an empirical equation with appropriate capacity of validation is not ...


    By IWA Publishing

  • Improving predictions made by ANN model using data quality assessment: an application to local scour around bridge piers

    The scour depth that develops around bridge piers is known to be related to flow intensity, particle size of bed sediment, and pier dimensions. Earlier approaches to this issue have mainly relied on empirical formulas. Even numerical simulations have not been so successful due to problems associated with interactions between water flow and streambed morphology. This necessitates the ...


    By IWA Publishing

  • Modelling the failure modes in geobag revetments

    In recent years, sand filled geotextile bags (geobags) have been used as a means of long-term riverbank revetment stabilization. However, despite their deployment in a significant number of locations, the failure modes of such structures are not well understood. Three interactions influence the geobag performance, i.e. geobag–geobag, geobag–water flow and geobag–water flow–river bank. The aim of ...


    By IWA Publishing

  • Ranking ecological risks of multiple chemical stressors on amphibians

    Populations of amphibians have been declining worldwide since the late 1960s. Despite global concern, no studies have quantitatively assessed the major causes of this decline. In the present study, species sensitivity distributions (SSDs) were developed to analyze the sensitivity of anurans for ammonium, nitrate, heavy metals (cadmium, copper), pesticides (18 compounds), and acidification (pH) ...


    By John Wiley & Sons, Ltd.

  • Round Two—Confined Compression: Young's Modulus, Poisson's Ratio, and Ultimate Strength

    The Institute for Standards Research interlaboratory study of rock properties has provided precision statements for two additional ASTM rock-property test methods, D 5407 (Young´s modulus and Poisson´s ratio) and D 2664 (ultimate strength), both in confined compression. Three types of intact rock, Barre Granite, Berea Sandstone, and Tennessee Marble, were used in this study. Data were collected ...


    By ASTM International

  • EPA`s Ground Water Forum Electronic Data Deliverables Fact Sheet

    EPA's Ground Water Forum Electronic Data Deliverables "fact sheet and appendix" http://deq.mt.gov/wqinfo/datamgmt/MTEWQX.mcpx http://www.dec.ny.gov/chemical/62440.html Electronic Data Deliverables: The Importance of Receiving Your Site and Project Data Electronically An EDD is a data file (or files), in a specified format, designed to transmit information ...


    By EarthSoft, Inc

  • LabHQ LIMS Solution

    LabHQ Ltd. is a young and dynamic company that provides Laboratory Information Management Systems (LIMS) to businesses of all sizes throughout a range of industries. Our primary vision is to offer the most innovative software applications and world-class services to enable companies to derive the maximum possible value from their laboratory processes.A LIMS is a piece of software that allows ...


    By Broughton Software

  • Aspects of the BEIR VII Report: a critical evaluation

    The Biological Effects of Ionising Radiation (BEIR) Reports have historically played a major role in determining how regulatory bodies characterise radiation risks at the doses and dose rates experienced by radiation workers and members of the general public. The latest report, BEIR VII, whose stated purpose was to provide risk estimate for exposure to low-dose, low Linear-Energy-Transfer (LET) ...


    By Inderscience Publishers

  • Review of laboratory‐based terrestrial bioaccumulation assessment approaches for organic chemicals: Current status and future possibilities

    In the last decade, there has been renewed interest in approaches for the assessment of the bioaccumulation potential of chemicals, principally driven by the need to evaluate large numbers of chemicals as part of new chemical legislation while reducing vertebrate test organism use called for in animal welfare legislation. This renewed interest has inspired research activities and advances in ...


    By John Wiley & Sons, Ltd.

  • Prediction of local scour depth at bridge piers under clear-water and live-bed conditions: comparison of literature formulae and artificial neural networks

    The scouring effect of the flowing water around bridge piers may undermine the stability of the structure, leading to extremely high direct and indirect costs and, in extreme cases, the loss of human lives. The use of Artificial Neural Network (ANN) models has been recently proposed in the literature for estimating the maximum scour depth around bridge piers: this study aims at further ...


    By IWA Publishing

  • Managing data quality: What does your chemical result mean?

    What does your chemical result mean? How does one result relate to another result taken 3 months earlier? Were the analytical methods the same?  Were the sampling procedures the same? Are these questions that you can answer?Quality assurance provides a history for every piece of data, enabling validation and traceability of your data. Quality assurance of data should be a prime concern of every ...


    By EarthSoft, Inc

  • Uncertainty in environmental analysis: theory and laboratory studies

    In this paper, theoretical and practical aspects of uncertainty in environmental laboratory analysis are presented and discussed. A more detailed theory of uncertainty is described, with special emphasis on the factors which contribute to the understanding of this in order to obtain accurate environmental laboratory data analysis. A full discussion is reported relating to approaches used to ...


    By Inderscience Publishers

  • ANFIS-based approach for scour depth prediction at piers in non-uniform sediments

    An estimation of scour depth is a prerequisite for the efficient foundation design of important hydraulic structures such as bridge piers and abutments. Most of the scour depth prediction formulae available in the literature have been developed based on the analysis of the laboratory/field data using statistical methods such as the regression method (RM). Conventional statistical analysis is ...


    By IWA Publishing

  • Estimation of postfire nutrient loss in the Florida everglades

    Postfire nutrient release into ecosystem via plant ash is critical to the understanding of fire impacts on the environment. Factors determining a postfire nutrient budget are prefire nutrient content in the combustible biomass, burn temperature, and the amount of combustible biomass. Our objective was to quantitatively describe the relationships between nutrient losses (or concentrations in ash) ...

  • Estimation of postfire nutrient loss in the Florida everglades

    Received for publication August 28, 2008. Postfire nutrient release into ecosystem via plant ash is critical to the understanding of fire impacts on the environment. Factors determining a postfire nutrient budget are prefire nutrient content in the combustible biomass, burn temperature, and the amount of combustible biomass. Our objective was to quantitatively describe the relationships between ...

  • Computerised LIMS

    In today’s modern analytical laboratory such as a contract research organisation (CRO), a laboratory information management system (LIMS) is no longer a luxury but a necessity, critical to the management and control of laboratory data and information. Due to the rising cost in R&D and biotechnology, many companies are looking at ways to maximise efficiency and profitability in order to ...

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