燃气轮机叶片材料0Cr17Ni4Cu4Nb砂带磨削性能研究

理论分析了在切除过程中磨粒与材料表面的交互作用机理,进行了砂带磨削燃气轮机叶片材料0Cr17Ni4Cu4Nb的试验研究,系统分析了各磨削工艺参数对材料切除率的影响规律,该研究对生产实践具有理论指导意义.     

斜巷轨道运输伤害事故的原因分析与防范措施

对煤矿倾斜井巷轨道运输较为多发的伤害事故发生的原因进行了归纳和分析,在此基础上提出了综合性的防范措施。     

Antireflection and band gap extension effects of ZnO nanocrystalline films grown on ITO-coated glasses by low temperature process

Zinc oxide (ZnO) nanocrystalline films coated on indium tin oxides (ITO, 90:10 wt%) glasses were prepared by low temperature process. The thin films were composed of uniform nanoparticles with average diameter around 8.4 nm. All samples exhibited excellent optical antireflective phenomena, and the maximum transmission reached 92.8% for the sample spin coated at 1500 rpm at 453 nm, improved by 21.5%. The antireflective results were explained by the coherence theory. And the antireflective effects were induced by the ITO and ZnO films. The calculated thicknesses of the ZnO films agreed well with the experimental results. The theoretical calculated band gap from the average diameter of ZnO nanoparticles was also well consistent with the experimental ones obtained from the optical transmission spectra. This result was promising for applications in organic solar cells.     

A π-extended tetrathiafulvene derivative: Synthesis and photoluminescence properties

Solid-state emissive organic materials have received increasing attention due to their prospective applications in large-area. Here, a novel π-extended tetrathiafulvene derivative DPD with donor-π-donor structure has been newly developed to produce the prominent characteristic of aggregation-induced enhanced emission (AIEE) that exhibits higher fluorescence quantum efficiency in solid film compare to its solutions. The AIEE mechanism of DPD was studied in detail through photophysical investigations and can be dominant attributed to the formed excimer state of DPD and J-aggregates in solid state.     

依靠科技进步解决安全难题创建高产高效矿井

白集煤矿以其采深大、地压地温高、通风系统线路长、提升运输环节多等复杂条件而著称于苏北矿区。作为一座地方中小型矿井,始终没有放弃创新发展的机会。依靠科技进步,解决安全难题,创建高产高效矿井。     

Synthesis, characterization and osteoconductivity properties of bone fillers based on alendronate-loaded poly(ε-caprolactone)/hydroxyapatite microspheres

A superior drug controlled release system capable of achieving efficient osteogenesis is in imperative demand because of limited bone substitute tissue for the treatment of bone defect. In the present study, we investigated the potential of using poly(ε-caprolactone)–hydroxyapatite (PCL–HA) composite microspheres as an injectable bone repair vehicle by controlled release of alendronate (AL), a medicine that belongs to the bisphosphonates family. The PCL/HA–AL microspheres were prepared with solid/oil/water emulsion technique, which included two processes: (1) AL was loaded on the hydroxyapatite nanoparticles; (2) the HA–AL complex was built in the PCL matrix. The spherical PCL/HA–AL microspheres were characterized with its significantly improved encapsulation efficiency of hydrophilic AL and better sustained release. Human bone mesenchymal stem cells (hMSCs) were cultured on the surface of these microspheres and exhibited high proliferative profile. Specifically, in osteogenic medium, hMSCs on the surface of PCL/HA–AL microspheres displayed superior osteogenic differentiation which was verified by alkaline phosphatase activity assay. In conclusion, by presenting strong osteogenic commitment of hMSCs in vitro, the PCL/HA–AL microspheres have the potential to be used as an injectable vehicle for local therapy of bone defect.     

深圳市天然气安全应急储备及事故气源的研究

分析了深圳市建设天然气安全应急储备及事故气源的必要性,通过对深圳市天然气产业链中各环节之间相互关系的分析,提出了建设实施方案。     

Plant Responses to Herbivory,Wounding, and Infection

Plants have various self-defense mechanisms against biotic attacks, involving both physical and chemical barriers. Physical barriers include spines, trichomes, and cuticle layers, whereas chemical barriers include secondary metabolites (SMs) and volatile organic compounds (VOCs). Complex interactions between plants and herbivores occur. Plant responses to insect herbivory begin with the perception of physical stimuli, chemical compounds (orally secreted by insects and herbivore-induced VOCs) during feeding. Plant cell membranes then generate ion fluxes that create differences in plasma membrane potential (Vm), which provokes the initiation of signal transduction, the activation of various hormones (e.g., jasmonic acid, salicylic acid, and ethylene), and the release of VOCs and SMs. This review of recent studies of plant–herbivore–infection interactions focuses on early and late plant responses, including physical barriers, signal transduction, SM production as well as epigenetic regulation, and phytohormone responses.     

综合型贯标工作在水利水电企业中的实施

随着水利水电建设工程不断向坝体高、规模大、结构复杂及工期要求紧、质量安全要求高的方向发展,施工的复杂性、难度性和风险性不断增加。工程建设与工程所在地居民安全、生活环境之问的关系愈加密切,各种人文、社会和环境方面的矛盾和问题时常出现。党和政府提出的构建和谐社会的战略纲领,为工程项目建设和谐工地指明了方向。