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 37 for “"Complex sample"”.
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Optimization of capillary GC/FTIR for complex sample analysis
… parameters. For adequate separation of complex samples the efficiency of WCOT (Wall Coated Open Tubular) fused silica capillary columns was found to be unmatched by packed columns or wide bore glass capillaries. A consequence of using more narrow bore columns, however, is lower sample …
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THE DEVELOPMENT AND STUDY OF CHELATING SUBSTRATES FOR THE SEPARATION OF METAL IONS IN COMPLEX SAMPLE MATRICES
… determination of trace metals in a variety of complex sample matrices.
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MINIATURE MASS SPECTROMETER SYSTEM WITH A SAMPLING PROBE
… used in the analytical laboratory. It requires complex sample preparation before the analysis. Use of miniature mass spectrometer enables the chemical analysis outside the lab and a sampling probe provides convenience for real-time analysis. Two miniature mass spectrometer systems have been …
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Design and Application of Hollow Silica Microspheres for Density-based Bioseparations
… of low-abundance biological analytes from complex mixtures, such as biological fluids and food extracts, still exist and are critical for the management of infectious diseases like influenza and gastroenteritis. Typically, analytes must be separated and concentrated from complex sample …
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Design and application of hollow silica microspheres for density-based bioseparations
… of low-abundance biological analytes from complex mixtures, such as biological fluids and food extracts, still exist and are critical for the management of infectious diseases like influenza and gastroenteritis. Typically, analytes must be separated and concentrated from complex sample …
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Análise de dados amostrais complexos utilizando redes neurais
… considers the data coming from an simple random sample with replacement. However, in practice the selection of simple random samples for surveys is rarely used and more complex sampling schemes are used. The complex sampling schemes reflect complex structures from population. These structures of …
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Statistical models for estimating the intake of nutrients and foods from complex survey data
… in nutrition. These surveys often utilise complex sample designs for efficient data collection. There are several challenges in the statistical analysis of dietary intake data collected using complex survey designs, which have not been fully addressed by current methods. Firstly, the shape …
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The Association between Breast Feeding and Being Overweight in Children
… children, ages 3 to 5, were included in the sample. SPSS Complex Sample software was utilized to generate for all analyses. Complex samples crosstabs was utilized to see if there is association between the outcome and risk factors. Complex samples logistic regression was done to assess …
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THE FABRICATION AND STUDY OF METAL CHELATING STATIONARY PHASES FOR THE HIGH PERFORMANCE SEPARATION OF METAL IONS
… high efficiency separation of trace metals in complex samples, using a single column and isocratic elution, is described. Hydrophobic, neutral polystyrene divinylbenzene resins were either impregnated with chelating dyes or dynamically modified with heterocyclic organic acids, using physical …
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Expanding the Capabilities of Paper Spray Mass Spectrometry: High-Throughput Drug Screening and On-Paper Electrokinetic Stacking
… analytes, susceptibility to matrix effects in complex samples, and inconsistent quantitative performance. Such limitations have restricted the application of PS-MS in fields requiring high sensitivity in analysis of complex biological matrices. This dissertation explores approaches to enhance …
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The Relationship Between Obesity and Falls in Older Adults
… Survey were used as research data, and complex sample design analysis was conducted for statistical analysis. According to the BMI classification standard of Korean Society for the Study of Obesity ("KOSSO"), low weight of older adult was 3.7%, normal weight was 35.7%, overweight was …
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Enhancing the science return of Mars missions via sample preparation, robotic surface exploration and in orbit fuel production
… surface probes will most likely be equipped with complex Sample Preparation And Transfer (SPAT) facilities. Future rovers will need to be able to perform longer traverses and delicate sample acquisition operations. Mars return missions would benefit from a new propulsion system, with better fuel …
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Modeling Autocorrelation and Sample Weights in Panel Data: A Monte Carlo Simulation Study
… and autoregressive moving average-ARMA) and sample weights present in a longitudinal panel data set. Specifically, to what extent are the sample estimates influenced when autocorrelation (which is usually present in a panel data having correlated observations and errors) and sample weights …
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Variação de renda familiar, desigualdade e pobreza no Brasil
Nesse trabalho busca-se investigar as relações entre crescimento econômico, distribuição de renda e pobreza no período de 1995 a 2005, mostrando a relevância do esclarecimento dessas relações para implementação de políticas públicas que visem à melhoria das condições sociais. Inicialmente o estudo …
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Creating a Map for Surgeons: Direct Blotting Assisted Stamping of Tissue for MALDI Imaging Mass Spectrometry
… percentage of biomolecules that can be imaged, complex sample handing steps lead to loss of/or distortion of analytes, and the significant amount of time between sample harvest and analysis. To address the shortcomings of cumbersome sample preparation associated with tissue analysis, not limited …
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Variance Spectroscopy and its Application to the Study of Single-Wall Carbon Nanotubes
… in the local composition of dilute nanoparticle samples. The data are spectrally resolved, allowing for the analysis of individual SWCNT emitters in a complex sample. Several thousand statistically independent spectra from different regions are measured using custom instrumentation. The mean and …
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Chip-Scale Gas Chromatography
… instruments hold the promise of consuming small sample volumes and are thus less prone to cross-contamination. Gas chromatography (GC) is the leading analytical instrument for the analysis of volatile organic compounds (VOCs). Due to its wide-ranging applications, it has received great attention …
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Trends in Tungsten Coil Atomic Spectrometry
… and even a non-metal at low levels in different samples. Improvements in instrumentation and new strategies to reduce matrix effects and background signals are presented. Investigation of the main factors affecting both WCAAS and WCAES analytical signals points to the importance of a reducing, …
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Lithographically Fabricated Micro-Reflectors for Sensitive Point of Care Diagnostics
… of these diagnostic methods, however, require complex sample processing steps or labels (typically a dye, enzyme or fluor) which can suffer from low signal strength or photo-bleaching (of fluors), and can require elaborate instrumentation for their detection. Here, we propose several diagnostic …
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Estimation of the Scale of Injury according to Severity
… injury of each county were grasped by conducting complex sample frequency analysis on death, hospitalization, outpatient department according to gender, ages, occurrence season and intention, and injury mechanisms, using the Cause of Death Statistics data, 2011, from National Statistical Office …
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