A Novel Elliptical Ring Microstrip Patch Antenna for Ultra-Wideband Applications

This paper proposes a new ultra-wideband (UWB) antenna. The proposed antenna is designed for operation from 3 to 15 GHz. It consists of a Sierpinski fractal based ellipse etched onto the radiating patch and a rectangular defected ground structure in the ground plane. Details of the proposed antenna as well as with variations in design variables are presented and the results discussed.

     

α‐l‐Rhamnosidase from Aspergillus flavus MTCC‐9606 isolated from lemon fruit peel

An α‐l ‐rhamnosidase producing fungal strain has been isolated from decaying lemon fruit. The fungal strain has been identified as Aspergillus flavus. The α‐l ‐rhamnosidase has been purified from the culture filtrate of the fungal strain using ultra filtration and cation exchange chromatography on carboxy methyl (CM) cellulose. The molecular mass of the purified enzyme determined by SDS–PAGE analysis was 41 kDa. The K_m values of the enzyme using p‐nitrophenyl‐α‐l ‐rhamnopyranoside and naringin as the substrates were 1.89 and 1.6 mm respectively. The pH and temperature optima of the enzyme were 11.0 and 50 °C respectively. The effects of various chemical species present in grape fruit juice and wine on the activity of the enzyme have been determined.     

手机和其他小型显示屏市场

中小型显示屏市场前景看好小型显示屏在消费电子领域扮演着重要角色,其市场总值在200亿美元左右。它不仅仅为客户提供了新的体验,同时也是用户选择产品时考虑的一个因素。而高质量的液晶显示屏价格持续下降也促进了市场的发展。预计未来几年这一市场的销售收入复合增长率将达2％,2007年的市场增长将非常迅猛。尽管这一市场在销售量上不断提高,但价格的下降将产生抵消作用。如果各供应厂家     

Degradation of 2,4,6-trichlorophenol by photo Fenton’s like method using nano heterogeneous catalytic ferric ion

Laboratory scale studies were conducted to find out the effect of modified photo Fenton’s like method on the degradation of 2,4,6-trichlorophenol (TCP). Nano scale iron (III) catalyst bound onto the surface of heterogeneous carbon binder was used in this photo Fenton’s like method. The studies were carried out in a continuous mode under the solar radiation. The various operating parameters like pH, H₂O₂ concentration, catalyst: binder ratio and flow rate were optimised and the effect of initial concentration of TCP on this newly developed method was also studied. The best conditions for the solar light based degradation were found to be pH-3, H₂O₂ - 800 mg/L, catalyst (Fe): binder ratio - 1:1 and flow rate - 7.4 mL/s for 100 mg/L of TCP in 4 h. The degradation and mineralisation efficiencies at the optimised conditions were 100% and 89% respectively.     

Global optimization of an industrial gas network operation

Air Liquide operates several industrial gas pipeline networks around the world, connecting air separation plants to customers of industrial gases. The operation of such a network of plants, pipelines, and customers is complicated due to fluctuating electricity prices and customer demands. We describe a complex industrial problem for real‐time optimization of network operations in the presence of these challenges. We then summarize a concerted modeling and algorithmic effort toward global optimization of this model. The resulting advances include development of a regression‐based fully‐deterministic nonconvex optimization model, a tool for diagnosing infeasibilities during model development, reformulations and scaling to make the model more amenable for optimization, and development of strengthened relaxations for its efficient solution. We provide details on the development of these tools and techniques that facilitated the solution of this model in a reasonable computational time with the global solver BARON. © 2016 American Institute of Chemical Engineers AIChE J, 62: 3215–3224, 2016     

On the Production of Hydrogen from Bio-Oil: A Representative Study Using Propylene Glycol

In a bio-refinery focused on fast pyrolysis, hydrogen (H₂) producible from reforming of the aqueous fraction of bio-oil with steam can be utilized for upgrading pyrolytic lignin into fuels by hydrotreatment. In this work, propylene glycol (PG) was chosen as a typical compound symbolizing higher polyols in the bio-oil aqueous fraction. Catalytic processing of PG into H₂ at low temperature (T = 500°C) was investigated using several commercial catalysts such as Ni/Al₂O₃, Ru/Al₂O₃, Ru/C, Pt/C, and Pd/C in a laboratory-scale fixed-bed reactor. The efficiencies of the catalysts were presented as selectivity to CO, CO₂, CH₄ and H₂, and PG conversion into gaseous phase. Wide ranges of temperature (300–500°C), W/F_O (18.6–92.9 g h/mol), and S/C ratio (5.6–12.7 mol/mol) were examined using Ni/Al₂O₃. At T = 500°C, H₂ selectivity (73.7%) and PG conversion (66.2%) were maximized using ratios of catalyst mass to molar flow rate of PG (W/F_O) = 18.6 g h/mol and steam to carbon (S/C) = 12.7 (10 wt% PG solution). It was found that Ni/Al₂O₃ demonstrates stable operation for at least 6 h of time-on-stream. Finally, a plausible reaction pathway for PG reforming was proposed.