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  • 1
    Electronic Resource
    Electronic Resource
    Developmental Toxicity of Lead-Contaminated Sediment to Mallard Ducklings (2000)
    Springer
    Archives of environmental contamination and toxicology 39 (2000), S. 221-232 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Sediment ingestion has been identified as an important exposure route for toxicants in waterfowl. The toxicity of lead-contaminated sediment from the Coeur d'Alene River Basin (CDARB) in Idaho was examined on posthatching development of mallard (Anas platyrhynchos) ducklings for 6 weeks. Day-old ducklings received either untreated control diet, clean sediment (24%) supplemented control diet, CDARB sediment (3,449 μg/g lead) supplemented diets at 12% or 24%, or a positive control diet containing lead acetate equivalent to that found in 24% CDARB. The 12% CDARB diet resulted in a geometric mean blood lead concentration of 1.41 ppm (WW) with over 90% depression of red blood cell ALAD activity and over threefold elevation of free erythrocyte protoporphyrin concentration. The 24% CDARB diet resulted in blood lead of 2.56 ppm with over sixfold elevation of protoporphyrin and lower brain weight. In this group the liver lead concentration was 7.92 ppm (WW), and there was a 40% increase in hepatic reduced glutathione concentration. The kidney lead concentration in this group was 7.97 ppm, and acid-fast inclusion bodies were present in the kidneys of four of nine ducklings. The lead acetate positive control group was more adversely affected in most respects than the 24% CDARB group. With a less optimal diet (mixture of two thirds corn and one third standard diet), CDARB sediment was more toxic; blood lead levels were higher, body growth and liver biochemistry (TBARS) were more affected, and prevalence of acid-fast inclusion bodies increased. Lead from CDARB sediment accumulated more readily in duckling blood and liver than reported in goslings, but at given concentrations was generally less toxic to ducklings. Many of these effects are similar to ones reported in wild mallards and geese within the CDARB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002440010099
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative study of the constitutive equations to predict the work hardening characteristics of cast Al-7wt.%Si-0.20wt.%Mg alloys (2000)
    Springer
    Journal of materials science 19 (2000), S. 2179-2181 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006706912301
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  • 3
    Electronic Resource
    Electronic Resource
    Recognising Uniqueness in the Technology Key Learning Area: The Search for Meaning (2000)
    Springer
    International journal of technology and design education 10 (2000), S. 105-123 
    Details
    ISSN: 1573-1804
    Keywords: primary school teaching ; professional development ; technology education
    Source: Springer Online Journal Archives 1860-2000
    Topics: Art History , Education , Technology
    Notes: Abstract The purpose of this study was to investigate areas of significance which were related to the understanding of technology and technology education, identified by teachers introducing the key learning area, technology, into their primary school classrooms for the first time. Working from Australia's national document on technology education, A Statement on Technology for Australian Schools (Curriculum Corporation, 1994), two teachers wrestled with how to fit this new curriculum area into their current classroom programs, their understandings of technology as a phenomenon and with their beliefs about teaching and learning in general. The study showed that the teachers made sense of technology education as it related to, from their perspectives, ideas about and aspects of primary school classrooms with which they felt comfortable. Implications for professional development include the need to acknowledge and value the prior experiences and understandings of primary teachers. The challenge for teachers in implementing technology education is gaining a conceptualisation of the learning area, which in some respects, is very like other more familiar learning areas in the primary curriculum, but in many other respects, unique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008945013123
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  • 4
    Electronic Resource
    Electronic Resource
    Study of Cyclization of Chelating Compounds Using Electrospray Ionization Mass Spectrometry (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 245 (2000), S. 293-300 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Electrospray ionization mass spectrometry (ESI-MS) was used for the study of cyclization of organic chelating compounds (chelators). Four chelating compounds were studed: Symmetrical ethylenediaminediacetic acid (s-EDDA), Unsymmetrical ethylenediaminediacetic acid (u-EDDA), N-(2-hydroxyethyl) ethylenediaminetriacetic acid (HEDTA), and N-(2-hydroxyethyl)iminodiacetic acid (HEIDA). The chelators were cyclized with treatments of acids and heating. The open and cyclized form of the chelators were semi-quantified by both positive and negative ion modes ESI-MS. The kinetics of chelator cyclization was studied as a function of reaction temperature and the pH of the matrix. The cyclization of s-EDDA was found to be a pseudo-first order reaction in s-EDDA and overall second order. The cyclizations of HEIDA and HEDTA are reversible reactions. Higher temperature and lower pH favors cyclization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006750102833
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of Scintillation Detection Efficiencies of Depleted Uranium (DU) in Wounds (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 243 (2000), S. 451-457 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Three tissue-equivalent cylindrical wound phantoms with varying activities of DU metal imbedded at varying depths were used to compare the efficiencies of a bismuth germinate (BGO) detector, a sodium iodide (NaI), and two identical wound probes with smaller sodium iodide crystals. Our results show that the BGO detector had the highest efficiency (1.0·10-3) and the lowest minimum detectable activity (MDA = 5.8 kBq) for the shallow depth DU phantom, relative to the other detectors. The BGO detector also had the highest peak efficiencies (1.7·10-3 and 5.8·10-4) and the lowest MDAs (3.5 and 10.0 kBq) for the medium and deep phantoms, respectively. Other detectors' performance data are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1016034300588
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  • 6
    Electronic Resource
    Electronic Resource
    Preservice Primary Teachers' Thinking About Technology and Technology Education (2000)
    Springer
    International journal of technology and design education 10 (2000), S. 81-101 
    Details
    ISSN: 1573-1804
    Keywords: independent projects ; preservice teachers ; primary school design and technology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Art History , Education , Technology
    Notes: Abstract It is apparent from previous research that primary school teachers have very limited or narrow perceptions of design and technology and such views may affect adversely their ability and confidence to teach the key learning area of design and technology in the classroom. Therefore, it is the task of technology teacher educators to provide experiences that will broaden preservice teachers' perceptions of technology and technology education. This paper reports an investigation, using an interpretive research methodology, of preservice primary teachers' prior perceptions of design and technology and changes in their perceptions of design and technology as a result of their engagement in independent technology projects. Students enrolled in a one-year postgraduate teacher education program were the participants in the study and the methods of data collection included the use of survey instruments, interviews, field notes and students' reflective journals. The results indicate that the independent projects broadened and deepened the students' understandings of technology as a process. The implications of the approach for the design of technology education courses for preservice and inservice teachers are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008941520152
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  • 7
    Electronic Resource
    Electronic Resource
    Recognising Uniqueness in the Technology Key Learning Area: The Search for Meaning (2000)
    Springer
    International journal of technology and design education 10 (2000), S. 105-123 
    Details
    ISSN: 1573-1804
    Keywords: primary school teaching ; professional development ; technology education
    Source: Springer Online Journal Archives 1860-2000
    Topics: Art History , Education , Technology
    Notes: Abstract The purpose of this study was to investigate areas of significance which were related to the understanding of technology and technology education, identified by teachers introducing the key learning area, technology, into their primary school classrooms for the first time. Working from Australia's national document on technology education, A Statement on Technology for Australian Schools (Curriculum Corporation, 1994), two teachers wrestled with how to fit this new curriculum area into their current classroom programs, their understandings of technology as a phenomenon and with their beliefs about teaching and learning in general. The study showed that the teachers made sense of technology education as it related to, from their perspectives, ideas about and aspects of primary school classrooms with which they felt comfortable. Implications for professional development include the need to acknowledge and value the prior experiences and understandings of primary teachers. The challenge for teachers in implementing technology education is gaining a conceptualisation of the learning area, which in some respects, is very like other more familiar learning areas in the primary curriculum, but in many other respects, unique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008945013123
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  • 8
    Electronic Resource
    Electronic Resource
    Atomic force microscopy using plastic replicas (2000)
    Springer
    Journal of materials science 35 (2000), S. 757-765 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Scanning probe microscopy is now an accepted tool in both industrial and research efforts. Its development parallels the advances in technology and imaging applications found in the history of progress of both transmission electron microscopy and scanning electron microscopy. All three forms of microscopy ultimately suffer a fundamental application problem—situations arise where it is either unreasonable or impossible to observe a particular sample within the sample stage of the microscope. For the transmission and electron and scanning electron microscopies, this problem has been resolved by resorting to making a replica of the area of interest on the actual sample and preparing the replica so that it may be imaged directly by the desired microscopy technique. This work attempts to ascertain the suitability of observing replicas using a scanned probe microscope; specifically, employing the techniques of atomic force microscopy to image plastic surface replicas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004769620450
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  • 9
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    Developmental Toxicity of Lead-Contaminated Sediment to Mallard Ducklings (2000)
    Springer
    Details
    Publication Date: 2000-08-01
    Print ISSN: 0090-4341
    Electronic ISSN: 1432-0703
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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  • 10
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    Influence of microstructure on high-cycle fatigue of Ti-6Al-4V: Bimodal vs. lamellar structures (2002)
    Springer
    Details
    Publication Date: 2002-03-01
    Print ISSN: 1073-5623
    Electronic ISSN: 1543-1940
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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