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Microelectronic components are introduced to an increasing number of applications as part of a controlling or monitoring device, as sensors or as means to tracking. Depending on the application, extreme loading profiles may need to be endured such as high temperatures, random vibrations or humid and even wet environments. Absorbed moisture has a plasticizing effect on the physical properties of polymers...
The in-line X-ray phase contrast imaging technique relies on the measurement of the Fresnel diffraction intensity patterns associated to a phase shift induced by the object. The simultaneous recovery of the phase and of the absorption is an ill-posed nonlinear inverse problem. If the object is made up of several homogeneous materials, the absorption and the phase are proportional in each material...
We rigorously determine the effect of parasitic loss on the achievable absorption enhancement in nanophotonic, plasmonic light trapping schemes. We show that, even in the presence of parasitic loss, opportunities exist to exceed conventional limits.
Progress in developing a cost effective technique for fabrication of orientation patterned GaP templates and a reliable technology for thick epitaxial growth on them is described. First 350 μm thick device quality OPGaP is produced.
We study spectral attenuation limits in silica hollow core negative curvature fibers. We demonstrate transmission to 4.3 μm wavelength and analyze the attenuation curve. The lowest attenuation measured is 24 dB/km at 2400 nm wavelength.
A solar cell or photovoltaic cell is a device which generates electricity directly from visible light. However, the Gratzel solar cells' efficiency is fairly low. So, it costs expensive according to other energy resources products. There is several factors affect gratzel solar cell efficiency which formed from chlorophyll. This research work is a comparative study between Grätzel chlorophyll solar...
Research activities in smart materials and structures are very important today and represent a significant potential for technological innovation in mechanics and electronics. The growing interest of our society in the problem of sustainable development motivates a broad research effort for optimizing mechanical structures in order to obtain new functional properties such as noise reduction, comfort...
This essay established the determination of cadmium content in the food paper and plastic packaging materials with wet digestion-flame atomic absorption spectrometry. The detection limit and relative standard deviations of cadmium were 0.0056μg/ml and 1.93%. The recoveries of cadmium ranged from 91.92% to 96.37%. The method has the advantages of low detection limit, high accuracy and good precision.
Projections indicate that video will be responsible for 90% of network traffic until the end of the decade. Considering the high cost of media production and, mainly, the high consumption of network resources for applications that explore it, it will be extremely important to monitor such use, preventing against wrong or distorted views of this consumption. Within this scenario, it is necessary to...
A detailed broadband analysis of the resonant absorptions of different common explosives in the range from 0.1–6 THz is presented. Dependencies of the resonance features on different sample parameters are evaluated via spectroscopic investigation of transmission and reflection. A significant dependency on the manufacturing process is observed.
In this paper, niobium doped titanium oxide were synthesized and investigated as a cathode catalyst support material for polymer electrolyte membrane fuel cell (PEMFC). In chemical synthesis, we used two different methods 1) a low-temperature synthesis route for NbxTi1−xO2 (x = 0.1, 0.005) via a surfactant templating method 2) NbO2 and TiO2 sintered at high temperatures (700°C and 1000°C) to form...
Nanolasers made from III–V active materials and metal-clad cavities have attracted research interest because of the small volume possible with metal nanocavities.1 Proposed applications include intrachip optical interconnects and optical sensors. The metal-clad nanocavities are one of several cavity approaches being studied, and differ from dielectric and semiconductor nanocavities in their high optical...
In the subwavelength regime, the optimal surface texture for light trapping in solar cells remains to be found. We use computational inverse electromagnetic design to find the optimal nanoscale surface texture.
In this paper, the progress in cancer diagnosis and treatment were reviewed which is based on gold nanorods (Au-NRs). Synthesis and properties of Au-NRs were described, more specifically on typical methods of surface modification, surface active agent selection, as well as biological image and cancer treatment which are based on Au-NRs. Also current difficulty and future development were discussed.
Novel blue light-emitting materials were designed by the substitution at the 4-position of 1,8-naphthalimide with electron-donating phenoxy group. The effect of molecular structure on the photophysical, electronic structure properties of the derivatives was explored by UV-visible absorption spectroscopy, photoluminescence spectroscopy, cyclic voltammetry and quantum chemical calculations. Both UV-visible...
Toluene diisocyanate (TDI), Polyether diol, and diethylenetriamine were used to synthesize the A-component of adhesives. B-component was prepared by the EP (E-51) and acetic ether. A series of polyurethane adhesive was obtained by A-component and B-component in different proportions. Infrared spectrum, peel strength, shear strength and bibulous rate were measured, the results indicated that the sample...
Technology integrated innovation is realized by integrating the useful features of two or more technologies to improve one technology or create a new product. The method for technology integrated innovation is discussed. Referring to gene recombination, the conception of technology basis recombination is put forward. A design process model for technology integrated innovation based on technology basis...
The continuous increase of solar cell efficiencies is related to a large extent to a number of device structure improvements such as the introduction of selective emitters, selective front surface fields (FSF) or local back surface fields (BSF). These structures allow even more complex solar cell designs like passivated emitter and rear contacts/locally diffused (PERC/PERL), metal/emitter wrap through...
The luminescent materials that have been used for luminescent down-shifting (LDS) range from organic molecules and organometallic complexes to quantum dots (QDs), each of them with certain strengths and weaknesses. In this work, we introduce five figures of merit to quantitatively evaluate how the properties of these materials compare with the desirable properties of an optimum LDS layer, focusing...
This paper studies the feasibility of using GaN/InGaN quantum dot as the Intermediate Band Solar Cell. Different dot sizes and layers are compared and the result shows significant differences due to different quantum confinement strength. The band structure and transition rate in the quantum dot are calculated. The efficiency of the strucutre can reach 31% in this structure. With these information,...
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