大倾角综放面预掘巷道群快速过断层技术

针对长壁工作面过断层时存在产量低、煤质差、工期长及安全系数低等问题,提出了预掘巷道群快速过断层技术,即在考虑断层落差、工作面开采条件及支架稳定性的基础上,确定出大倾角综放面过断层的"预想层位",并在此层位上预掘若干条巷道(巷道群),使工作面连续推过预掘巷道群过断层。此项技术的关键为:1)预掘巷道群围岩控制技术,包括其布置方式、预掘巷间岩柱尺寸及支护参数等;2)大倾角综放面过断层期间支架稳定性控制技术,即考虑走向角度对液压支架倾向稳定性及倾向角度对液压支架走向稳定性的影响,分析大倾角(双斜)综放面过断层期间支架失稳机理,得出支架不倾倒、不滑移所需的临界支护阻力,并提出对应控制技术。高庄煤矿3上1101大倾角综放面应用此项技术,快速(历时23 d)推过了落差为13.5 m的断层,保证了工作面(呈双斜状态)过断层期间原煤产量的稳定。     

含环氧基有机硅氧烷的研究进展

含环氧基有机硅氧烷是一类兼具环氧与硅氧烷两种结构特性的化合物,因其优异的机械性能、环境稳定性和环氧基团的反应性能得到研究学者的广泛关注。以环氧基在化学结构中的不同位置为线路,系统地介绍了近年来国内外有关不同类型的含环氧基有机硅氧烷的多种制备工艺,并对其物化性能及应用情况进行了详细的介绍。研究开发高性能的含环氧基团有机硅氧烷,对于改性环氧树脂和满足高功率LED对封装材料日益提升的性能要求具有重要意义。     

宝日褐煤及其干燥煤和半焦的润湿热变化规律

采用μRC微量热仪研究了宝日希勒褐煤及其500℃热解半焦在25℃下的润湿热.结果表明,褐煤的含水量对润湿热有较大影响,含水量低于16%的干燥煤润湿热随着含水量的降低而增加,含水量高于16%的宝日褐煤润湿时的放热量可忽略不计;半焦在空气中由于氧化吸湿,润湿热降低,暴露48h后润湿热降低为原来的1/2,暴露240h后润湿热降为原来的12%,并不再随暴露时间的增加而降低;半焦的润湿热与半焦粒度无关,而润湿时的放热速率随粒度的增大而降低;褐煤的表面官能团与半焦的表面官能团有较大差别.研究表明,表面官能团对润湿热有较大影响.     

Effect of hydroxyl groups on hydrophilic and photocatalytic activities of rare earth doped titanium dioxide thin films

Rare earth(Y, La and Nd) doped TiO2 thin films were prepared on glass slides by sol-gel method. The photocatalytic decomposition of methylene blue in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities. The effects of hydroxyl groups on hydrophilic and photocatalytic activities were investigated by means of techniques such as X-ray diffraction(XRD), atomic force microscopy(AFM), Fourier transform infrared(FTIR), optical contact angle, UV-Visible spectroscopy and VIS spectroscopy. The results showed that an appropriate doping of rare earth could cause the TiO2 lattice distortion, inhibited phase transition from anatase to rutile, accelerated surface hydroxylation and produced more hydroxyl groups, which resulted in a denser surface and smaller grains(40–60 nm), and a significant improvement in the hydrophilicity and photoreactivity of TiO2 thin films. The optimal content of rare earth was between 0.1 wt.% and 0.3 wt.%. Moreover, the modification mechanism of rare earth doping was also discussed.     

重大工程项目群综合集成管理方法应用研究 ——以深圳前海19 单元03 街坊项目群为例

运用集成方法从重大工程业主统筹项目的角度进行系统性思考是应对重大工程项目群系统复杂性的关键视角。基于综合集成管理方法,以项目群型重大工程为例,结合深圳前海19 单元03 街坊项目,以综合集成管理的相关文献为基础,建立了综合集成管理的理论模型,从重大工程综合集成管理的多层次协调机制、过程集成、知识集成、技术集成、治理机制集成5 个维度全面分析了综合集成管理方法在重大工程管理的应用。相关案例发现和经验总结丰富了重大项目群管理系统集成的内涵和方法,同时为业主项目群管理带来实践指导。     

东北诸流域:哈尔滨城市空间营造

该文是个案研究系列之东北诸流域哈尔滨城市空间营造研究,对哈尔滨城市族群的更替叠累及城市空间营造进行了分析研究。     

Specific Oxygenated Groups Enriched Graphene Quantum Dots as Highly Efficient Enzyme Mimics

Significant progress is achieved for the utilization of graphene quantum dots as enzyme mimics in various biomedical fields recently. Although promising, the biocatalytic performance is far from satisfactory. Here, the rational design and synthesis of specific oxygenated groups enriched graphene quantum dots (o‐GQDs) via a facile oxidation reflux route is reported. These well‐prepared o‐GQDs with uniform size exhibit an ultrahigh peroxidase‐like activity in a wide range of pH values, and their superior performance is verified by using glucose detection as a typical model. Compared with classical nanozymes, these o‐GQDs show multiple times higher enzymatic activity. It is believed that the super facile synthesis strategy can greatly facilitate the practical use of o‐GQDs as enzyme mimics in the future.     

产教融合背景下高职特色专业群“平台+模块”课程体系建设研究

In view of the problems in the construction of characteristic professional groups in higher vocational colleges, the professional group of "intelligent manufacturing" is taken as the research object, and the "platform + module" suitable for the development of the industry will be constructed according to the content of the vocational ability planning courses of the post group. The curriculum system establishes the framework of professional groups, and explores and forms a strategic study to optimize and integrate professional group resources.     

行人同伴群社会力学仿真

针对同伴群的群体动力学、其比例和规模对行人流的影响以及拥挤人流中的形态特性和活动特性研究还很不充分的问题,采用改进社会力学行人同伴群模型并构建仿真平台,对不同场景进行仿真研究.结果表明:同伴群降低了行人流平均速度,且随着人群密度增加,同伴群平均速度也会减小.同伴群尺寸越大,平均速度越低,对群体平均速度降低作用越明显.同伴群减弱了行走空间宽度增加带来的行人流速度增加趋势.同伴群在人群中表现出了更稳定的行走路径和行走速度,虽然同伴群降低了人群疏散的效率,但产生了"路径效应".     

Wine-related aromas for different seasons and occasions: Hedonic and emotional responses of wine consumers from Australia,UK and USA

It is still not fully clear how particular aromas in wine may affect consumers’ liking and emotional responses, and whether these change in different contexts and seasons. Therefore, a study was conducted with 3000 regular wine consumers from Australia, UK and USA using an online survey that assessed liking for 59 wine aromas, and from which 9 aromas, selected as representatives of groups of similar aromas, were profiled for elicited emotions by the ScentMove™ scale.The most liked wine aromas across all countries were ‘berry-like’, followed by ‘vanilla’, ‘chocolate’, ‘citrus-like’ and ‘honey’. Interestingly, aromas with the same liking rating displayed significantly different emotional profiles which seemed to drive differences in preferred consumption occasion and season. For example, highly liked ‘passionfruit’ aroma, associated with happy, relaxed and romantic emotions, was suitable for many occasions and seasons, ‘lemon’ evoked energetic emotions and was preferred in wines consumed at parties/BBQs in summer, while ‘chocolate’ would fit well in a restaurant. Hedonic and emotional responses towards selected wine aromas differed between various demographic groups. Gender, age and consumption frequency had greater effects than education or income, with similar patterns found in each country indicating similarity in wine cultures and the language used. The national influence was more reflected in the polarised rating by the USA consumers compared to UK and Australia. This information could be utilised to produce wines for specific occasions and seasons.