Regioselective Palladium(0)-Catalyzed Cross-Coupling Reactions of Brominated Furans, Thiophenes, Pyrroles and Selenophenes and Synthesis of N,O-Heterocycles by Cyclocondensations of Hydrazone and Oxime Dianions

The main work focuses on Palladium chemistry in organic synthesis to give new methodologies for functionalization of heterocycles, such as, furan, thiophenes, pyrroles and selenophenes. In addition, the second part of this thesis is a contribution to the chemistry of 1,4-C,N-dianions. The facile synthesis of pyrazole and oxazine by cyclocondensation of Hydrazone and Oxime Dianions was studied

Optimal Creation of Agent Coalitions for Manufacturing and Control

Cooperation among agents has been the object of many recently published papers. Cooperation might be formulated and work in many forms, between different kinds of agents and situations in which they are situated. In addition, it is also influenced a lot by the agent's intelligence, mutual relationships and the willingness to cooperate with other ones. The main focus of this paper is to solve the problem of how to create optimal coalitions of the given agents with the purpose to improve the collective performance. The coalition is a possible form of cooperation in which the common goal has the highest priority for all members included in it. Further, we introduce methods for finding the sub-optimal solutions, which are able to approximate the range of the optimal solutions. Finally we discuss the problem of creating coalition with more parameters

Tailoring Surface Properties of Fiber Materials:Novel Opportunities in the Fabrication of Multi-scale Fiber-based Architectures

Many surface properties of materials can be tailored by a proper physical patterning. Such patterned surfaces, commonly fabricated by wafer-based techniques, have been widely exploited for light trapping in advanced photovoltaic systems, for tailoring the hydrophobicity of surface, and for enabling the preferential positioning and growth of biological cells. Nevertheless, wafer-based techniques, despite being versatile and mature, are limited to small, flat and rigid Silicon substrates. There is however an increasing demand for micro and even nanoscale patterns to be deployed over large-area and flexible substrates, over fabrics and textiles, or within confined 3D hollow cavities. Other techniques such as roll-to-roll processes bring some solutions but cannot address the patterning of high curvature surfaces that has resisted scientist and engineers for decades. In this thesis, we propose to exploit the emerging field of multi-material thermal drawing to realize submicrometer scale structure on the surfaces of fibers and ribbons. We then go one step further in the assembly of multi-scale functional architectures by using textured fibers as building blocks in novel additive manufacturing processes. At the heart of the project is the fabrication of potentially kilometers-long polymer fibers with controlled hierarchical surface textures of unprecedented complexity and with feature sizes down to a few hundreds of nanometers. To achieve this result, we first establish a theoretical framework to understand the reflow behavior of the structure during the drawing process, which is identified as the reason behind structure collapsing. From this framework, a strategy is developed to reduce the surface/interfacial tension of textured polymers, thus drastically slowing down the reflow, enabling to create for the first time submicrometer textured fibers. These developments are shown in Chapter II, III and IV of this thesis. In addition, the understanding of reflow during the drawing process, in combination with previous work on capillary break-up, allows us to propose an empirical law, presented in Chapter V, to predict the cross-sectional preservation during a preform-to-fiber deformation, the most important feature for the drawing of functional fibers so far. The law is well verified by successful draws of preforms with freely movable domains, based on which we fabricate micro electro-mechanical fiber devices that can detect and localize multiple pressure points along their length with submillimeter resolution. Finally, in Chapter VI we demonstrate the use of multi-material textured fibers as building blocks for the assembly of advanced 2D and 3D functional constructs. We show two examples of microfluidic devices and of capacitive-touch sensing panels, highlighting the novel opportunities in the scalable nano-scale fabrication of complex devices enabled by the results of this thesis

PDGF受容体アルファシグナルは、NAD との密接な機能的相関を介して神経幹細胞とそのニッチの老化を調節する

富山大学・富生命博甲第144号・Dang Son Tung・2022/09/28・★論文非公開★富山大

Applying calcium fluoride and silica particles: A solution to improve color homogeneity of pc-WLEDS

This article focuses on enhancing the lighting efficiency of pc-WLEDs, a new and advanced lighting solution that has received lots of attention. To adapt to the demand of modern lighting, the lighting performance of pc-WLEDs must be improved, especially the color homogeneity and luminous flux, two of the most important quality indicators of pc-WLEDs. Through experiments, this article proposes using the scattering enhancement particles (SEPs) such as CaF2 and SiO2 with yellow phosphor Y3Al5O12:Ce3+ in pc-WLEDs configuration. The pc-WLEDs model is created by using the LightTools program and set at 8500 K correlated color temperature, while the experimental results yielded from this simulation will be verified by Mie-scattering theory. The information from this article reveals the scattering coefficients of SEPs at 455 nm and 595 nm wavelengths. Moreover, it is confirmed that the employment of CaF2 is effective in promoting the color but may damage the luminous efficiency if the concentration is too high while the SEP material, SiO2, exhibits high luminous efficiency at all concentration