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PCs all-in-one for dummies
If you're a PC owner, you have a pretty good idea of just how much there is to discover about your PC, whether you use it for work or play. Comprised of nine minibooks, this All-in-One guide covers essential PC topics from soup through nuts, including the latest updates to PC hardware, Windows 8, the Internet, Office 2013, digital media, upgrading and troubleshooting, social media, and home networking.
Book
Photonic Crystals Assembled by SiO.sub.2@Ni/TiO.sub.2 for Photocatalytic Reduction of CO.sub.2
Photonic crystal (PC) can manipulate light propagation due to the presence of photonic band gap (PBG). PBG can redistribute density of optical state. When the PBG overlaps with the emission of an emitter embedded in PC, the excited electrons will be prohibited from transferring to the ground state. Introducing PC with suitable PBG into photocatalyst will partially reduce the electron-hole combination and improve photocatalytic efficiency. Meanwhile, appropriate specific surface area of 3-D quasi-ordered structure can increase the contact area of catalysts and CO.sub.2 to provide more catalytic sites, which plays an important role in the improvement of photocatalytic activity. Herein, SiO.sub.2@Ni/TiO.sub.2 PCs with designed PBG were fabricated and applied as catalysts for photocatalytic CO.sub.2 reduction using [Ru(bpy).sub.3]Cl.sub.2·6H.sub.2O as photosensitizer. The designed SiO.sub.2@Ni/TiO.sub.2 PCs has a suitable specific surface area and certain surface roughness, which can effectively adsorb CO.sub.2 for photocatalytic reduction. Meanwhile, the PBG of SiO.sub.2@Ni/TiO.sub.2 PCs matches well with the electron-hole combination energy of the photosensitizer, the electron-hole combination process from the excited state falling back to the ground state can be prevented partially. Suppressing the falling of excited electrons will make electrons transfer to the catalyst, thereby improving the photocatalytic performance.
Journal Article
Optimizing Cementitious Materials for SiO.sub.2 AerogelGypsum Composites
To prepare [SiO.sub.2] aerogel gypsum-based lightweight thermal insulation wall materials with better water resistance, a -hemihydrate gypsum (HG) was used as the main cementitious material. By adding portland cement (PC), fly ash (FA), and hydrated lime (HL), HG was modified. Using these materials, the HG-PC system and HG-PC-FA-HL system were constructed. The effects of inorganic admixture content on the performance of both systems were analyzed. Results show that the mechanical properties and water resistance were improved after adding a certain proportion of mineral admixtures to HG. The mechanical properties and water resistance of the HG-PC-FA-HL system were better than those of the HG-PC system. At the content of 9 wt. % FA, 20 wt. % PC, and 4 wt. % HL, the 28-day strength reached 41.07 MPa (5955 psi), the water absorption after soaking for 48 hours was 12.7%, and the softening coefficient was 0.72. Keywords: gypsum-based cementitious materials; [SiO.sub.2] aerogel inorganic composite materials; solid wastes; water resistance.
Journal Article
How to talk to your computer
Introduces young children to computer languages and explains programs and how to write them.
Book
Enhancing the Ultraviolet Aging Resistance of Asphalt by Incorporating TiOsub.2-Intercalated Layered Pitch-Based Porous Carbon
The long-term exposure of asphalt pavement to ultraviolet radiation causes significant performance degradation and reduces its service life. To enhance the UV resistance of asphalt, nanocomposite modifiers have been incorporated through mechanical blending. However, their effectiveness has been largely limited by poor component uniformity. To address this issue, UV-resistant antioxidant nano-TiO[sub.2] was employed to modify the UV-shielding of layered porous carbon (PC), resulting in the synthesis of nano-TiO[sub.2] intercalated PC (TiO[sub.2]/PC). The PC nanosheet was modified by TiO[sub.2] nanoparticles via in situ growth, significantly improving the dispersion homogeneity of TiO[sub.2]. Comprehensive characterization (SEM/EDS/FT-IR/XPS) confirmed the successful synthesis of TiO[sub.2]/PC with well-defined interfacial bonding. Compared to control samples (PC, TiO[sub.2], and TiO[sub.2] + PC), the asphalt modified by TiO[sub.2]/PC-2 composite demonstrated superior UV aging resistance, lower physical aging indices and reduced rheological aging parameters. Moreover, TiO[sub.2]/PC modifier prominently suppressed the formation of oxidative groups (C=O/S=O), improved the colloidal stability, and delayed the sol–gel transition of the modified asphalt. The synergistic UV shielding mechanism was attributed to the enhanced UV absorption of TiO[sub.2], multi-reflection and scattering within the PC matrix, and the radical scavenging capabilities of both components. These results provide new design insights for developing anti-UV aging modifiers for asphalt pavements.
Journal Article