Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"TBT"”.
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The remediation of tributyltin-contaminated dredgins and waters
Tributyltin (TBT) is a pollutant, mainly introduced to the environment as a marine anti-fouling agent. The aim of this work was to assess and develop sustainable and cost-effective remediation technologies for TBT-contaminated dredged materials. For this purpose, analytical methods were developed …
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Vergleichende Evaluationsstudie zur Wirksamkeit des Tinnitus-Bewältigungs-Trainings und der Tinnitus-Retraining-Therapie
… (1996a), mit dem Tinnitus-Bewältigungs-Training (TBT, Kröner-Herwig 1997), welches bereits evaluiert wurde, verglichen. Beide Therapieformen wurden außerdem mit einer einzelnen Edukationssitzung (EDU) verglichen, die als Kontrollgruppe fungierte.Die TRT wurde als Gruppentherapie mit fünf Sitzungen …
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Improving the measurement of butyltin compounds in environmental samples
Tributyltin compounds (TBT) are highly toxic pollutants, mainly introduced to the environment as a marine antifouling agent. The main aim of this work was to evaluate the present methods for the measurement of TBT and its breakdown products dibutyltin and monobutyltin in environmental sediments and …
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The fate of organotin biocides in marine antifouling elastomers.
… that the majority of the tri-n-butyltin (TBT) biocides are converted to TBT-chloride, TBT-stearate and di-n-butyltin distearate during the polymer processing and curing conditions.Similar studies of triphenyltin (TPT)-containing elastomers demonstrate the extensive chemical degradation …
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Performance evaluation of a mechanical vapour compression desalination system
… which include the top brine temperature (TBT), brine recirculation rate, compressor speed and brine concentration. The setup showed better performance with higher TBT, higher compressor speed and lower brine concentration. The brine recirculation rate influenced the performance a little. …
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Efficacy of an Integrated Sleep and Anxiety Intervention for Anxious Children: A Pilot Randomized Controlled Trial
… the efficacy of Targeted Behavioral Therapy (TBT), an integrated intervention that targets sleep problems and anxiety in children with generalized anxiety disorder (GAD). The current pilot study used a randomized, controlled design to examine the efficacy of TBT compared to ‘gold standard’ …
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Organismi acquatici e ambiente: meccanismi biochimici di interazione, risposta e adattamento
… out by exposing mussels to various tributyl tin (TBT) concentrations under controlled conditions in aquaria. ATPase activities were determined spectrophotometrically according to the principles of the method of Fiske and Subbarow (1925). The main results obtained are detailed below. In Tapes …
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Environmental speciation of tin and lead by HPLC-ICP-MS
… employed for the determination of tributyltin (TBT), triphenyltin (TPhT), dibutyltin (DBT) and monobutyltin (MBT) in environmental samples. The coupling between high performance liquid chromatography (HPLQ and the inductively coupled plasma-mass spectrometer (ICP-MS) for this application has …
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Organotin and osmoregulation: quantifying the effects of environmental concentrations of sediment-associated tri-n-butyltin and triphenyltin on osmoregulatory processes in the European flounder Platichthys flesus (L)
… of sediment-associated tri-o-butyltin chloride (TBTCl) and triphenyltin chloride (TPhTCl), was examined and quantified. Radiotracers were used to measure hydromineral fluxes, the water balance and passive sodium efflux of chronically (35 days) exposed fish. The water permeabilities of exposed …
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Characterizing the Use of Continuous Glucose Monitors During Experimentally-Induced Short-Term Low Energy Availability in Female Endurance Runners
… target" range (TAT), "time below target" range (TBT), as well as glycemic variability using MAGE (mean of amplitude of glucose excursions) and MODD (mean of daily differences). 70 to 120 mg/dL was set as the target range. Data was analyzed using repeated measures analysis of variance; post hoc …
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Modulation of aging process by diet and crosslinking inhibitor and their effects on production in poultry
… with tendon breaking strength (TBS), time (TBT) and meat tenderness (SF) were carried out. Chicks were randomly divided into four dietary groups from eight to 125 wks after hatch: ad libitum (AL); diet restricted (DR, fed 60% of ad libitum ); AL and DR groups supplemented with 400 ppm AG …
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A study of potentially toxic elements in the Forth and Clyde Canal, Scotland, UK
… (MBT), dibutyltin (DBT) and tributyltin (TBT) were measured using GC-ICP-MS. Levels of Me-Hg (3.44 - 14.1 μg/kg) were < 0.58% of the pseudototal Hg content. The likely source is in situ bacteria-mediated methylation of inorganic Hg. Organotin mean concentrations were low at 28.6 - 71.8, …
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Neural network based hybrid modelling and MINLP based optimisation of MSF desalination process within gPROMS: Development of neural network based correlations for estimating temperature elevation due to salinity, hybrid modelling and MINLP based optimisation of design and operation parameters of MSF desalination process within gPROMS
… desalination industry. Top Brine Temperature (TBT) (boiling point temperature of the feed seawater in the first stage of the process) is one of the many important parameters that affect optimal design and operation of MSF processes. For a given pressure, TBT is a function of Boiling Point …
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The Impact of Technical Measures on Agricultural Trade: A Case of Uganda, Senegal, and Mali."Improving Food Security through Agricultural Trade"
… technical measures notified under the SPS and TBT agreements and the non-technical measures to trade. Two approaches are used; the inventory approach and the econometric approach which makes use of the gravity model. The inventory results suggest that African countries face more restrictions on …
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International Agricultural Trade Costs and Non-Tariff Measures
… (SPS) measures and technical barriers to trade (TBT) measures from the National Trade Estimate Report of the United States Trade Representative. Using this dataset, we quantify the impact of SPS and TBT measures on U.S. agricultural exports. We find that the existence of NTM measures reduces U.S. …
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Effects of pollution on marine crustaceans in Qatari waters : a baseline survey and a case study on genotoxicity indicators in an endemic shrimp
… (MBT), dibutyltin (DBT) and tributyltin (TBT) were detected in all three species. TBT levels were observed at 0.58ngSng-1, 0.78ngSng-1 and 1.91ngSng-1 for P. segnis, B. Amphitrite and P. khori respectively. The results also revealed that concentrations of the contaminants within water …
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Evaluation of the Development and Effectiveness of Copper Total Maximum Daily Loads (Tmdls) to Achieve Marine Water Quality Criteria
… a number of these chemicals (e.g., tributyltin [TBT], copper) federal and state water quality standards exist to protect aquatic organisms. As a means to comply with water quality standards, regulatory agencies establish Total Maximum Daily Loads (TMDLs) to reduce concentrations of toxic …
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Student Evaluations of Teachers, Student Ratings of Teacher Behaviors, and Their Relationship to Student Achievement : A Cross Ethnic Comparison
… form and the Teacher Behavior Inventory (TBT) was used as a low-inference rating form. The sample included 414 students from one college with a multicultural population and 67 students from one college with a homogeneous ethnic population.</p> <p>Results. In both the college and the …
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Non-product related environmental process and production methods (NPR-PPMs): a view from international trade law and international environmental governance
… objectives both under the GATT and the TBT Agreement. However, an important challenge for the their compatibility with WTO law relate to aspects associated with arbitrary or unjustifiable discrimination. In the assessment of discrimination procedural issues play an important role. This …
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The effectiveness of antiscalants when used on multi-stage flash distillers.
… Performance Ratio (PR), Top Brine Temperature (TBT), antiscalant type, and dosing rate.The antiscalant dosing rate was calculated for each day together with the overall heat transfer coefficients and fouling factors for the brine heater and the heat recovery sections. Recorded data and …
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