Under the background of large-scale civil aircraft development and engineering practice, research on the key technology of the new generation civil aircraft is the important start point to achieve multi-point technolo...
详细信息
We review recent results obtained in [14] on weak turbulence of shear-Alfven waves in the limit of strongly anisotropic pulsations that are elongated along a strong external magnetic field. The kinetic equation for en...
详细信息
ISBN:
(纸本)0735401489
We review recent results obtained in [14] on weak turbulence of shear-Alfven waves in the limit of strongly anisotropic pulsations that are elongated along a strong external magnetic field. The kinetic equation for energy is presented at the level of three-wave interactions. It is in agreement with the Galtier et al. [13] formulation of the full three-dimensional helical case when taking the proper limit. The simplified formalism induced by the new approach renders the applicability conditions for weak turbulence more transparent. It provides an attractive theoretical framework for describing anisotropic MHD turbulence in astrophysical contexts where a strong magnetic field is present and for which shear-Alfven waves are important.
In this article, we propose to develop dye-sensitized solar cells (DSSCs) based on vertically aligned TiO2-nanowire (NW) and Ag nanoparticle (NP) assisted vertically aligned TiO2-NW (TAT) photoanode fabricated by the ...
详细信息
ISBN:
(纸本)9789811923081;9789811923074
In this article, we propose to develop dye-sensitized solar cells (DSSCs) based on vertically aligned TiO2-nanowire (NW) and Ag nanoparticle (NP) assisted vertically aligned TiO2-NW (TAT) photoanode fabricated by the glancing angle deposition (GLAD) technique on FTO substrates. The scanning electron microscope (SEM) analysis reveals that the Ag-NP assisted vertically aligned TiO2-NW photoanode was deposited on FTO substrates. The average length and diameter of the NW have been measured to be similar to 350 nm and similar to 90-100 nm, respectively. And, the X-ray diffraction (XRD) investigation reveals the presence of small crystals of TiO2 and Ag from the weak peaks. Further, the absorption spectrum analysis shows that the incorporation of Ag-NP in TiO2-NW increases the intensity of absorption in the visible region. The calculated bandgap of the annealed Ag-NP (30 nm)-assisted TiO2-NW (TAT@30 nm) sample using photoluminescence (PL) analysis is similar to 3.12 eV. Finally, the performance of two types of DSSC devices based on TiO2-NW and TAT@30 nm photoanode was analyzed. It is observed that the TiO2-NW-based DSSC device shows better performance in terms of photo-conversion efficiency compared to the TAT@30 nm photoanode-based device.
3D integration is critical technology to adopt shorten time-to-market, increasing function per area and reducing cost for not only mobile products but also medical and industrial equipment. And it is expected bridge t...
3D integration is critical technology to adopt shorten time-to-market, increasing function per area and reducing cost for not only mobile products but also medical and industrial equipment. And it is expected bridge technology between electronics products and semiconductors. Under this circumstance, two different approaches such as stacked semiconductor with silicon interposer and embedded devices into a printed wiring board, have been developing by famous institutes and industrial companies in Europe, Japan, Korea, Taiwan and US. One of low cost solution of 3D integration is utilize printed circuit board technology with embedded active and passive devices into inner layer. The advantages of embedded devices into substrate are still not well known among OEMs (Original Equipment Manufacturers) and semiconductor packaging designers, and it makes one of barriers to utilize and propagate this technology. However, several reports are already demonstrated the embedded devices interconnection reliability is more than two times higher than conventional surface mount technology. In addition, the embedded devices into substrate are provides better electrical performance, reduced warpage of packaging substrate and reduced cost. Also the embedded devices into substrate are contributes smaller form factor, righter weight and better performance of final products such as smart phones, digital still cameras and mobile PCs. This paper shows drivers of embedded devices into substrates, potential applications, market expectations and current status of embedded devices into PCBs in Japanese manufacturers. In addition, technology roadmap of embedded devices into substrate and difficult challenges are addressed in this paper.
Accurate energy demand forecasting in the building sector is essential for sustainable energy planning and policy development. This paper proposes a Genetic Algorithm GA based methodology for forecasting energy demand...
详细信息
Generating random numbers is essential in many cryptographic applications like key generation, protocols, nonce and also in Internet for choosing TCP sequence numbers for example. We need generators which are able to ...
详细信息
ISBN:
(纸本)9781467381970
Generating random numbers is essential in many cryptographic applications like key generation, protocols, nonce and also in Internet for choosing TCP sequence numbers for example. We need generators which are able to construct large amounts of secure random numbers. To this end, True Random Number Generators (TRNGs) which extract randomness from physical processes are usually used. The sequences generated by TRNGs cannot be reproduced. However, generating random numbers by this way is time-consuming and expensive. Another way to generate random numbers is to use deterministic random number generators in which the seed is reseeded many times during the generation of the sequence. In this paper, we propose a new pseudo-chaotic number generator (PCNG) that produces random numbers. The algorithm is refreshed many times by using entropy source from Linux kernel. Results of statistical properties (i.e. Nist, auto and cross-correlation, histogram, chi2-test) and software security analysis exhibit good performance thus demonstrating that the proposed generator can be used confidently to produce random numbers.
暂无评论