关于带钢拉矫纹的探讨

对拉矫机组在生产中带钢出现皱纹（折纹）、拉矫纹的现象进行了理论分析，并提出了解决办法。     

Effect of Na<Subscript>2</Subscript>CO<Subscript>3</Subscript> and CaCO<Subscript>3</Subscript> on coreduction roasting of blast furnace dust and high-phosphorus oolitic hematite

Iron was recovered from blast furnace dust and high-phosphorus oolitic hematite in the presence of Na₂CO₃ and CaCO₃ additives. The functions of Na₂CO₃ and CaCO₃ during the coreduction roasting process were investigated by XRD and SEM-EDS analyses. Results indicate that these additives not only hinder the reduction of fluorapatite, CaCO₃ also decreases the P content of direct reduced iron (DRI) by increasing the reduction alkalinity. P remains as fluorapatite in the slag, which can be removed by grinding and magnetic separation under optimal conditions. The Na₂CO₃ promotes hematite reduction and improves the iron recovery (ε_Fe) by replacing the FeO from fayalite, which results in quick growth and aggregation of metallic iron and improvement of ε_Fe in DRI. A DRI with 91.88 mass% Fe, and 0.065 mass% P can be achieved at a recovery of 87.86 mass% under the optimal condition.     

围岩松动理论指导井巷维修实践

1概况
　　新洛公司山西煤矿主采煤层23＃、21＃、13＃煤层，其中23＃煤层为厚煤层，平均厚度5.0 m ，煤层结构复杂，含多层薄层夹矸，普氏硬度3～4，煤层倾角8°～22°，煤层赋存相对稳定。23＃煤层伪顶为粉砂岩夹煤线，厚度0.8 m ，含炭质较高；直接顶为粗粉砂岩，厚度2.0m，致密坚硬；老顶为灰色细砂岩，厚度15 m ，坚硬。直接底为粉砂岩，厚度2.0m ，较坚硬，不易底鼓；老底为灰色细砂岩，厚度5m ，致密坚硬。该矿为瓦斯矿井，23＃煤层瓦斯绝对涌出量为3.17 m3／min ，相对涌出量6.28 m3／t ，煤层不易自燃，煤尘无爆炸性。     

Synthesis and curing of liquid crystalline epoxy resin based on asymmetric mesogen

A novel liquid crystalline epoxy resin (LCER) derived from asymmetric mesogen unit was synthesized. Its structure and liquid crystalline behavior were characterized by hydrogen nuclear magnetic resonance (H‐NMR), differential scanning calorimetry (DSC), polarized optical microscopy (POM). The results indicated that the LCER converted to a nematic phase at 85°C during heating and finally became isotropic at 145°C. The curing behavior and phase behavior of the LCER with 4,4′‐diaminodiphenyl methane and methyl hexahydrophthalic anhydride were also studied by DSC and POM, respectively. Their apparent activation energy (E_a) was evaluated according to the Ozawa's isoconversional method. The results suggested that autocatalytic reaction had occurred in these two systems. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

High-throughput low-delay MAC protocol for Tera Hertz ultra-high data-rate wireless networks

To address the problems of the present Tera Hertz medium access control(MAC) protocols such as not updating the time slot requests numbers in time, unreasonable superframe structures and not merging time slot requests from the same pair of nodes, high throughput low delay medium access control(HLMAC), a novel MAC protocol for Tera Hertz ultra-high data-rate wireless networks is proposed. It reduces the data access delay largely with a new superframe structure, from which nodes can get time slot allocation information immediately. The network throughput is also improved with the help of updating time slot requests number and merging time slot requests from the same pair of nodes. The theoretical analysis verifies the effectiveness of HLMAC, and the simulation results show that HLMAC improves the network throughput by 65.7% and decreases the access delay by 30%, as compared to energy and spectrum-aware medium access control(ES-MAC).     

Synthesis, Characterization and Gas Sensing Properties of In（OH）3 and In2O3 Nanorods through Carbon Spheres Template Method

Poly-crystalline In(OH) 3 nanorods have been successfully prepared via a urea-based precipitation using the colloidal carbon spheres as the templates. After calcinations, the resulted In 2 O 3 nanorods with poly-crystalline structure were fabricated. Structure and morphology of the product were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The possible formation process was schemed. The sensor gas properties towards C 2 H 5 OH and CO were examined.     

Covalently functionalized graphene by thiourea for enhancing H2-evolution performance of TiO2 photocatalyst

Graphene as a well-known electron cocatalyst can enhance the hydrogen-production performance of photocatalysts due to its excellent conductivity. For highly efficient graphene-modified TiO₂ photocatalyst, besides the speedy electron transfer via graphene, it is significant to raise the interfacial hydrogen-generation reaction rate on the graphene surface. In this paper, thiourea (TU) can covalently functionalize graphene and act as effective H⁺-adsorbed active sites to improve the hydrogen-production efficiency of graphene-modified TiO₂ (TiO₂/rGO-TU). The TiO₂/rGO-TU sample was successfully prepared by a facile nucleophilic substitution reaction between the thiol (-SH) of thiourea and carboxyl (-COOH) of graphene. The TiO₂/rGO-TU could possess the maximum H₂-generation rate of 241.83 μmol h^?1 g^?1, which was 2.33 and 6.60 times greater than that of TiO₂/rGO and TiO₂, respectively. The enhanced photocatalytic activity of TiO₂/rGO-TU can be ascribed to the synergistic effect of graphene and thiourea, namely, the graphene functions as a cocatalyst to capture the photoexcited electrons of TiO₂ and the thiourea acts as effectual H⁺-adsorbed active sites to promote interfacial hydrogen generation. This study presents a feasible strategy for developing grephene-based photocatalysts for prospective applications in the hydrogen-production field.     

Differences between beginning and advanced design students in analogical reasoning during idea generation: evidence from eye movements

Cognition, Technology & Work - In existing studies about analogical reasoning during idea generation in design, there is lack in quantitative and objective evidences showing the relationship...     

An internal combustion engine platform for increased thermal efficiency,constant‐volume combustion,variable compression ratio,and cold start

An internal‐combustion engine platform, which may operate on a portfolio of cycles for an increased expansion ratio, combustion under constant volume, variable compression ratio, and cold start, is introduced. Through unique thermodynamic cycles, the engine may be able to operate on a much greater expansion ratio than the compression ratio for a significantly improved thermal efficiency. This improvement is attained without involving a complex mechanical structure or enlarged engine size, and at the same time without reducing the compression ratio. The engine with these features may serve as an alternative to the Atkinson cycle engine or the Miller cycle engine. Furthermore, based on the same engine platform, the engine may operate on other cycles according to the load conditions and environmental considerations. These cycles include those for combustion under constant volume, variable compression ratio under part load conditions, and cold start for alternative fuels. It is believed that the introduced thermodynamic cycles associated with the engine platform may enable a future internal combustion engine that could generally increase the thermal efficiency by about 20% under full and part load conditions and overcome the cold start problem associated with diesel fuels or alternative fuels such as ethanol and methanol. Copyright © 2011 John Wiley & Sons, Ltd.