Removal of oxygenated volatile organic compounds by catalytic oxidation over Zr-Ce-Mn catalysts

The composition-activity relationship of Zr-Ce-Mn-O materials was investigated for the catalytic removal of Oxygenated Volatile Organic Compounds (OVOC) emitted by stationary sources. Using a sol-gel method, very high surface specific areas, small crystallite sizes and high redox properties were obtained for Zr(0.4)Ce(0.6-x)Mn(x)O(2) catalytic systems after calcination at 500°C. The textural and redox properties were improved when Mn content increased in the material, especially for x=0.36. As a result the most active and selective catalyst in the butanol (model of OVOC) oxidation was obtained for the nominal composition Zr(0.4)Ce(0.24)Mn(0.36)O(2) due to a high oxygen mobility and surface Mn(4+) concentration.     

Optimal sizing study of hybrid wind/PV/diesel power generation unit

In this paper, a methodology of sizing optimization of a stand-alone hybrid wind/PV/diesel energy system is presented. This approach makes use of a deterministic algorithm to suggest, among a list of commercially available system devices, the optimal number and type of units ensuring that the total cost of the system is minimized while guaranteeing the availability of the energy. The collection of 6 months of data of wind speed, solar radiation and ambient temperature recorded for every hour of the day were used. The mathematical modeling of the main elements of the hybrid wind/PV/diesel system is exposed showing the more relevant sizing variables. A deterministic algorithm is used to minimize the total cost of the system while guaranteeing the satisfaction of the load demand. A comparison between the total cost of the hybrid wind/PV/diesel energy system with batteries and the hybrid wind/PV/diesel energy system without batteries is presented.The reached results demonstrate the practical utility of the used sizing methodology and show the influence of the battery storage on the total cost of the hybrid system.     

A computational approach for corner and vertex detection

Corners and vertexes are strong and useful features in computer vision for scene analysis, stereo matching, and motion analysis. Here, we deal with the development of a computational approach to these important features. We consider first a corner model and study analytically its behavior once it has been smoothed using the well-known Gaussian filter. This allows us to clarify the behavior of some well-knowncornerness measure based approaches used to detect these points of interest. Most of these classical approaches appear to detect points that do not correspond to the exact position of the corner. A new scale-space based approach that combines useful properties from the Laplacian and Beaudet's measure (Beaudet 1978) is then proposed in order to correct and detect exactly the corner position. An extension of this approach is then developed to solve the problem of trihedral vertex characterization and detection. In particular, it is shown that a trihedral vertex has two elliptic maxima on extremal contrast surfaces if the contrast is sufficient, and this allows us to classify trihedral vertexes in 2 classes: vertex, and vertex as corner. The corner-detection approach developed is applied to accurately detect trihedral vertexes using an additional test in order to make a distinction between trihedral vertexes and corners. Many experiments have been carried out using noisy synthetic data and real images containing corners and vertexes. Most of the promising results obtained are used to illustrate the experimental section of this paper.     

100-112.Gbit/s complete ETDM systems based on monolithically integrated transmitter and receiver modules

Traditional intensity modulated two-level electrical time-division multiplexing(ETDM)transmission systems working at 100-112Gbit/s were investigated.The complete ETDM systems based on monolithically integrated transmitter and receiver modules were demonstrated with bit-error-rate(BER)performance of 10-8 at 107Gbit/s,and near error-free standard forward error correction(FEC)threshold(2×10-3)at 112Gbit/s.The experiment results showed that directly modulated high-speed ETDM transmission systems with the symbol rates at 100Gbaud and beyond were promising candidate for cost-effective 100GbE applications and might be a preform of the next generation of Terabit/s Ethernet.     

弱交流磁场下裸铜表面结晶特性研究

本文研究了环境温度恒定为25℃、相对湿度为49%、体积为0. 01 m L的液滴在-20℃裸铜底板的冻结实验,发现在附加交流磁场强度分别为2. 0×10^-3、2. 5×10^-3、3. 0×10^-3、3. 5×10^-3、4. 0×10^-3、4. 5×10^-3、5. 0×10^-3、5. 5×10^-3、6. 0×10^-3T的作用下,液滴结晶过冷度增大,最大过冷度提高了2. 08℃;但附加磁场会减小成核驱动力;相比无磁场情况下,液滴冷凝时间减少,凝结粒径相比无磁场下较小。通过对在相同温湿度下自然对流条件的冷铜底板结霜可视化研究发现,由于附加磁场使极性水分子有序的在底板排列,较无磁场下液滴结晶过程熵增更小,在宏观上呈现液滴有序排列。此外,实验发现在0～6×10^-3T的磁场强度范围,随着磁场强度的增大,平板单位面积结霜量减小,单位面积结霜量与交流磁场强度有较高的相关性,得到了拟合关...     

RGB-D feature extraction method for hand gesture recognition based on a new fast and accurate multi-channel cartesian Jacobi moment invariants

Multimedia Tools and Applications - Due to the diversity of hand gestures uses in human computer interaction and the complexity involved by gestures, many features have been proposed, however each...     

Gabor filter-based texture for ancient degraded document image binarization

Pattern Analysis and Applications - Binarization of ancient degraded document images is a very important step for their preservation and digital use. In this paper, a new simple threshold-based...     

Influence of Si substitution on magnetic properties,random anisotropy,and magnetocaloric effect of nanocrystalline Sm2Fe17−xSix

Journal of Materials Science: Materials in Electronics - Nanocrystalline iron-rich intermetallic compounds Sm2Fe17?xSix ( $$x = 0, 1, 1.5, 2$$ ) were studied by means of X-ray diffraction...     

Phase matched magneto optical single mode rib waveguides based on geometrical adjustments

In this work, we demonstrate via numerical simulation the design rules that must be imposed on the geometry of magneto optical rib waveguides to make them behave as single-mode and phase matched rib waveguides.