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The precipitous expansion of ecotourism destinations and tourists has intensified competition in the tourism business. Thus, the present study investigates the connection between destination image and travel motivation that marketers must comprehend and focus on establishing ecotourism in Bangladesh. Despite a growing number of works on destination image, there has been little investigation on the relationship between travel motivation. This study aims to evaluate the effect of destination image and travel motivation on tourists’ selection of ecotourism destinations. Therefore, it utilised a structured survey aimed at visitors during their on-site experiences, unlike earlier studies that mainly focused on identifying destination characteristics. Using SPSS-SEM, the suggested structural model was evaluated using a sample of 326 tourists from various Bangladesh’s ecotourism destinations. The results confirmed that cognitive and affective destination images significantly influence travel motivation. It also indicates a better understanding of the relationship and significant managerial implications for destination marketing managers.

Plasmonic is an emerging technology used to increase the performance of thin-film devices via light-trapping mechanisms. Recently, plasmonic devices have been used due to their nanoscale fabrication abilities. Metamaterials are promising candidates for improving the light absorption of plasmonic devices. The extraordinary properties of metamaterial-plasmonic devices (such as the perfect absorption of light) open up applications such as solar energy harvesting, photo-detecting and making batteries. This thesis focuses on the theoretical design and experimental studies of metamaterial-based perfect absorbers (MMPA) to improve their optical properties and applications (e.g., energy harvesting). I also design a high-power MMPA for high-power laser applications. First, I present the design and analysis of a high-power broadband perfect absorber. An array of rectangular patterns was placed to broaden the bandwidth so that the array can function between 950 nm and 1400 nm. Here, I propose a tungsten boride (a refractory ceramic) broadband metamaterial absorber and characterize its optical properties numerically and experimentally. I have also analyzed the damage characteristics of this absorber using a femtosecond laser and compared these with an ordinary gold metamaterial absorber. Second, a multilayer-based perfect absorber for omnidirectional capabilities is theoretically and experimentally analyzed. The device provides a reasonable amount of light absorption and thermal stability has been checked. Applying this device to high-temperature solar cell applications is discussed. I demonstrate a thermally stable broadband absorber based on an ultrathin layer of refractory ceramic, tungsten boride. I experimentally analyze and compare the performance of the absorber with an aluminum-based absorber. The multilayer perfect absorber has absorption higher than 85% in the wavelength range between 500 and 1600 nm over a large range of incident angles (up to 60 degrees). I show that a tungsten boride absorber has significantly better temperature stability compared to its aluminum counterpart, achieving stable operation at temperatures up to 270 ℃. These absorbers may have applications in solar thermophotovoltaic energy conversion. Third, a square hole structure is proposed, where a lossless silica dielectric material is combined with MnO2 materials. Then, the geometric parameters of this structure are numerically optimized at the desired application. An adequate choice of parameters, shape and the proper combination of materials can lead to an electrically tuneable metasurface. The structure can produce a 25% change of transmission with the applied electric power. Finally, I numerically analyzed and experimentally characterized Kevlar fabrics for the application of personal heat management. Heat management is essential for human comfort. In recent years, passive radiative cooling through heat transfer to outer space has been extensively studied. Personal temperature control is used to control the temperature of objects beyond the local environmental temperature. I show that Kevlar fabrics are transparent to mid-infrared human body radiation but opaque to visible light. Here, I have experimentally investigated the optical and thermal properties of Kevlar fabrics, which can have 90% emissivity in the mid-infrared region and produce a 2.6 ℃ temperature drop. I processed a Kevlar textile that promotes effective radiative cooling while retaining sufficient air permeability, water-wicking rate, and mechanical strength for wearability. The Kevlar fabric is an effective and scalable textile for personal thermal management.

The aim of this study is to find out what were the factors that may have played significant role to select the telecommunication service providers. In general this research has an intention to develop a research framework grounded on a strong theoretical and literature review background. The survey instruments employed on Bangladeshi consumers included demographic background, price, service quality, product quality and availability and promotional offers for consumer perception. Thus the structural equation modeling approach was necessary in order to examine the variables. The data analysis was conducted using SPSS and AMOS (Analysis of Moment Structure) with the software package for windows. From the result it is revealed that paths are related to the casual processes significantly. Among all the significant variables, from our result, Price is the most important among our respondents followed by Service quality, product quality and promotion. Further research should be considered to gather more information regarding the service quality and customers’ satisfaction dimensions in context of the Bangladeshi mobile phone operators. It is hoped that the findings of this study may assist mobile phone industry in Bangladesh about their services and promotion of their services. However, the findings of this study may provide needed feedback and contribute to the improvement of players’ strategy and their marketing program.