Plankton communities are influenced, in part, by water exchange with adjacent estuarine and oceanic ecosystems. Reduced advective transport through tidal passes or with adjacent bay systems can affect chemical processes and biological interactions, such as nutrient cycling, phytoplankton abundance and productivity, community respiration, and zooplankton biovolume. The most threatened estuarine ecosystems are shallow, bar-built, microtidal estuaries with small water volumes and restricted connections through tidal passes and other water exchange points. This research explored spatio-temporal trends in plankton communities and the physicochemical environment in Mesquite Bay, Texas a microtidal, bar-built, subtropical estuary in the Gulf of Mexico. This research couples sampling at fixedstations for multiple physical and biological parameters with high-resolution spatial mapping of physicochemical parameters. Spatial trends were less in magnitude and affected fewer parameters in fixed station and spatial data. Two dimensional ordination plots indicated spatial heterogeneity with a more pronounced temporal trend affecting parameters including temperature, salinity as a function of inflow timing, and seasonal wind direction affecting primary production and zooplankton biovolume. Temperature was positively correlated with gross production and respiration rates during spring and late summer with sporadic positive and negative correlations with phytoplankton biomass. The timing and magnitude of freshwater inflow affected various physicochemical and biological parameters. Higher than 71-year inflow rates resulted in low salinity system wide, with spatial heterogeneity increasing over the course of the study, which was confirmed by spatial maps. Additionally, high inflow rates led to two periods of increased inorganic nutrients and dissolved organic matter. Low salinity periods coincided with persistence of higher turbidity, likely because of decreased sediment flocculation. Gross production was low at this time, and likely from light limitation. Additionally, wind magnitude and direction created spatial heterogeneity in turbidity levels and phytoplankton biomass. Zooplankton biovolume was highest during spring and late summer with high species diversity in total rotifers. Copepod biovolume and phytoplankton biomass were positively correlated. Other zooplankton taxonomic groups exhibited variable correlations with phytoplankton biomass and other taxonomic groups. Further long-term studies are needed to determine interactions of various components of trophic food-webs and account for interannual variability in all system parameters.

This dissertation consists of two topics. One is a "Multi-pass Fiber Optic Surface Plasmon Resonance Sensor (SPR)" and the other is a "Nano-metallic Surface Plasmon Lens." Since both topics involved surface plasmon, the title of this dissertation is named "Surface plasmon coupled sensor and nanolens." For a multi-pass fiber optic SPR sensor, a fiber optic 4-pass SPR sensor coupled with a field-assist capability for detecting an extremely low concentration of charged particles is first demonstrated. The multipass feature increases the sensitivity by a factor equal to the number of passes. The field-assist feature forces charged particles/molecules to the SPR surface, increasing the sensitivity by an additional factor of about 100. Overall, the sensitivity exceeds the one-pass SPR device by a factor of about 400. A 10 pM concentration of 47 nm diameter polystyrene (PS) latex beads and 1 ?M concentration of salt dissolved in DI water were detected within a few seconds by the combined system. The equivalent index resolution for atomic size corresponding to ionized chlorine in salt is 10-8. This technique offers the potential for sensitive and fast detection of biomolecules in a solution. Secondly, a 44-pass fiber optic surface plasmon resonance (SPR) sensor coupled with a field-assist capability for measurement of refractive index change due to positive and negative ions is shown. The field-assist feature forces ions to the SPR surface, causing the SPR signal response to change which reflects a decrease or increase in refractive index depending on whether positive or negative ions are being attracted to the surface. This technique offers the potential for the sensitive detection of cations and anions in a solution. For a nano-metallic surface plasmon lens, we analyze the transmission of a normally incident plane wave through an Ag/dielectric layered concentric ring structure using finite difference time domain (FDTD) analysis. The dependency of the transmission efficiency on the refractive index in slit is studied. The numerical analysis indicates that the focusing beyond diffraction limit is found even at the extended focal length comparable to the distance of 7" from the exit plane using a circularly polarized coherent plane wave, ?=405 nm. Especially, compared to an Ag-only structure, the Ag/ LiNbO3 structure amplifies the transmission power by a factor of 6. Therefore, this Ag/dielectric layered lens has the potential for significantly higher resolution imaging and optical data storage.

Microwave and millimeter-wave phase shifters are one of the most important structures of the antenna series that are used in communication and radar applications. They are used to form the main beam of the electronically scanned phase array antennas and generate the appropriate phase values for the antenna elements design while providing electronic beam steering. In this thesis, S-band hybrid 4 bit phase shifter of 22.5&ordm / phase resolution is designed, simulated, fabricated and measured. Bits are separately designed to maintain low phase errors and return loss. In this manner, fabrication and measurements are performed for each bit. These measurements are carried on since each bit reached to its acceptable level of operation. According to the outcomes and acquired knowledge, layout for optimum cascading of 4 bits is developed. Measurement results are compared with simulations and repeatability is tested to observe if it is convenient to use in mass production. Designs and simulations are performed by using ADS2008&reg / .

This thesis analyzes the pass-through of external factors into consumer and producer prices in Turkey, with a special emphasis on import price pass-through. To this end, pricing along a distribution chain framework is utilized and it is estimated by Vector Auto Regression (VAR) in a sample period of April 2002 to March 2009. Results show that the pass-through of external shocks into producer prices is higher than it is for consumer prices. Compared with the results of previous studies, findings point out that the degree of pass-through has declined recently in Turkey. In addition, it is found that external factors had significant contribution to annual consumer inflation between 2006 and 2008. Nevertheless, even the contributions of external shocks are excluded, year-end inflation targets would not have been attained.

In this study, we aim to investigate the impact of inflation targeting (IT) and the recent global disinflation on exchange rate pass-through (ERPT) using quarterly data from 1980:1 to 2009:1 for 51 industrial and emerging market (EM) countries. To this end, we employ not only the conventional panel data estimation methods but also the recent Common Correlated Effects Pooled estimation procedure by Pesaran (2006) which allows estimating the impact of common global shocks such as global inflation. We also explore some other determinants of ERPT during the recent global disinflation period. Furthermore, we consider asymmetric effects of positive and negative output gaps as proxies for domestic demand conditions on ERPT for IT industrial and EM countries. Our results strongly suggest that, for the non-IT samples, ERPT is significantly higher in EM countries than industrial countries. For every country groups excluding Euro area countries, we find that ERPT declined substantially during the recent global disinflation period. The decline in the ERPT is, however, much higher in IT countries especially in EM ones. One striking result is the convergence of ERPT coefficients of EM countries to industrial IT countries with the adoption of IT. This supports the endogenous response of ERPT to monetary policy credibility and price stability. Consequently, a high ERPT, per se, may be interpreted as not a binding constraint for the adoption of IT as it tends to decline with the success of monetary policy regime. We also find that ERPT appears to be more sensitive to positive output gaps in IT industrial countries whilst it does not have such a response to positive or negative output gaps in IT emerging market countries.

In this study, a method to predict vehicle pass-by noise in a finite dimensioned, semi-anechoic chamber with chassis dynamometer has been developed. Vehicle noise has been modeled as the summation of the individual contributions regarding the principal noise components, namely, engine including air intake, front tire and rear tire noises. This method employs wave propagation, Doppler shift, and time delay in the estimation of the sound pressure due to each component at points of interest specified by relevant standards. An acoustical simulation model has been developed in MaTLAB environment. The model has been applied on two different vehicles. Finally, the predicted sound pressure values are found to be in good agreement with the corresponding values acquired in outdoor measurements addressed in ISO 362 for vehicle pass-by noise measurement standard.

The question of exchange rate pass-through into domestic inflation is a widely analyzed issue due to its importance as regards to monetary policy, exchange rate policy and in general macroeconomic policy for open economies. Although most of the literature is focused on the exchange rate pass-through at the aggregate level, there are fewer studies that are done at the sectoral level for the Turkish economy. In this study by using a distribution chain of pricing model developed by McCarthy (2000), pass-through of exchange rates and import prices into domestic prices for selected sectors are examined for the Turkish economy. The emprical model estimates a Vector Auto Regression (VAR) to see pass-through dynamics through times and across the selected sectors. This study covers March 2002-December 2010 period / the period of floating exchange rates. Findings indicate that pass-through has fallen recently in Turkey. Moreover, results of the analysis show that external factors explain an important proportion of the variance of domestic prices for the sectors which have a larger import share.

<p>Då scenkomplexitet och ett högre antal ljuskällor blir vanligare inom spel har ett behov av algortimer för att hantera dessa scener, med bra prestanda, uppståt. En allt vanligare algoritm för detta är Deferred Shading. Rapporten utvärderar två olika metoder för <em>Deferred Shading</em> (traditionell <em>Deferred Shading</em> och <em>Light pre-pass rendering</em>).</p>

<p>Deferred shading är en renderingsteknik som har blivit allt mer populär i och med att hårdvaraukraven för tekniken inte längre är ett hinder. Ett problem med deferred shading är fortfarande hur transparenta objekt ska hanteras. Rapporten utvärderar två olika deferred pipelines som hanterar transparent geometri på olika sätt, de två renderingsmetoderna är <em>Inferred Lighting</em> samt <em>Light Pre Pass </em>med framåtrendering för hantering av transparent geometri.</p>

Univ., Diss.--Bern, 2007.