假颗粒现象及其对再生铝镁碳制品性能的影响

对用后铝镁碳砖再生颗粒料的组成和结构特点进行显微分析,并通过改变混料方式以及不同粒度再生料的加入量研究假颗粒对再生铝镁碳制品结构与性能的影响.结果表明:用后铝镁碳砖再生料中含有约40%与废砖相组成和结构相似、骨料与基质并存于同一颗粒的二次颗粒,即所谓的"假颗粒",假颗粒的组成、结构及外形的均匀程度均远不如一次骨料颗粒;混碾可使用后铝镁碳砖再生料中假颗粒发生二次破碎,且粒度越大,发生二次破碎的颗粒数量越多;假颗粒二次破碎导致再生制品的粒度组成发生改变,进而影响其密度和耐压强度.     

Hydrothermal synthesis and photoluminescence behavior of CeO<Subscript>2</Subscript> nanowires with the aid of surfactant PVP

Well-crystalline CeO₂ nanowires were prepared via a surfactant-assisted hydrothermal process. Reaction temperature and reaction time were changed for the determination of optimal synthesis parameters. The as-obtained products were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and field emission scanning electron microscopy (FESEM). The results show that single crystal CeO₂ nanowires with high yield and good uniformity can be obtained hydrothermally at 180°C for 12 h with the aid of 2.0 g surfactant (polyvinyl pyrrolidone, PVP). The role of PVP was then discussed and a possible growth mechanism was proposed. Moreover, room temperature photoluminescence (PL) spectra were obtained for these CeO₂ nanowires, which are believed to be related to the abundant defects in these nanostructures.     

Preparation of superhydrophobic silver nano coatings with feather-like structures by electroless galvanic deposition

Superhydrophobic silver nanocoatings with feather-like morphology are fabricated on copper substrates by electroless galvanic deposition. The coating exhibit superhydrophobicity with a contact angle of 156.4° and glide angle of 4° without any further surface modification. Scanning electron microscope (SEM), X-ray diffraction (XRD) and contact angle measurements are used to investigate the morphology, crystal structure and superhydrophobicity, respectively, of the coatings. The coatings exhibit high thermal stability; their water contact angle did not change when the coatings were heated to 200°C for 2 h. The mechanism of superhydrophobicity of the silver coating is discussed based on the work of Amirfazli, Wenzel and Cassie.     

高校图书馆借阅超期的原因与对策

当前高校图书馆借阅超期较为普遍,通过问卷调查得知读者的借阅超期大多无恶意行为。针对这种情况以及高校图书馆自身的条件和特点,实施"告知服务"可减少借阅超期行为,以此提高图书的利用率。     

山西省国际商务人才引进和培养研究

山西作为能源大省,一直是中国对外经济活动的活跃力量.但是,近年来,随着对外合作的加深,也体现出一些制约因素,最主要体现在缺乏精通国际商务的高素质人才.从制约人才引进和培养的角度出发,客观分析造成山西国际商务人才现状的原因,并提出相应的对策.     

培养训练运动员在篮球场上的意识

"篮球意识"是指在复杂困难的环境中能随即应变地争取主动并正取的实施自己的行动和策略的一种即兴发挥能力.是在比赛中各种技术动力、战术灵活运用和发挥生理机能和技战术能力的自觉的、能动的、富有创造性的、具有特殊作用的心理活动.     

A multiple-labelling method for cells using Au nanoparticles with different shapes

An important and difficult issue is simultaneously identifying the detailed locations of various molecules on the cell surface, as this identification requires a synergistic effect between more than one molecule in a living cell. Au nanoparticles (NPs) with different shapes can be readily recognised under low vacuum scanning electron microscopy (lvSEM). Anisotropic Au nanorods (NRs) possess unique surface plasmon resonance (SPR) properties, which can be further utilised for two photon luminescence (TPL) and other optical imaging techniques. In this paper, Au NRs and Au nanooctahedra (Au NOs) are introduced as biomarkers for ICAM-1 and Integrin β1. Combined with the advantages of lvSEM, this multiple-labelling method is a new method for studying the interactions between specific, functional molecules.     

Concurrent transmission with minimal SR-pair interference in WiMAX mesh networks

Performance of wireless mesh networks can be greatly improved by spatial reuse (SR), therefore, lots of algorithms have been proposed to maximize the number of concurrent transmissions. However, most methods only considered the interference brought by the sender nodes. In this paper, we study the interference model in WiMAX mesh networks and propose a minimal SR-pair interference model to perform concurrent transmissions in both uplink and downlink directions. Simulation results show that our model is more efficient and stable, i.e., it increases the number of concurrent transmissions and its performance is constant and independent of transmission directions. Biography: XIONG Qing(1978–), male, Ph. D., research direction: wireless mesh networks.     

论网络称呼语“亲”的泛化

"亲"是2011年十大流行语之一,它不仅在网上流行而且也已经进入了我们的生活。它不反映人们彼此间的各种关系及所拥有的社会评价,所以本文认为"亲"属于称呼语。我们搜集了"亲"泛化的各种表现,并且对它的词义进行考察分析,认为"亲"是"亲爱的"缩略形式。从淘宝购物、交际需求、称呼语的缺失和社会功能这四个方面分析了"亲"泛化的原因,并且对它的发展前景进行了预测。     

长期体外反搏对颈动脉硬化及斑块形成的干预

目的：体外反搏能改善血管内皮细胞功能，长期体外反搏是否对动脉硬化及斑块形成产生影响呢？方法：采用彩色超声波检测颈动脉血管壁状态及损伤的程度，观察两组患者，体外反搏治疗组165例，反搏治疗时间1—9年（治疗组）未体外反搏治疗组68例（未治疗组）。结果：反搏组血管壁异常15．2％，斑块形成占11．5％，但反搏治疗2年以上，大于100次，斑块形成占4．2％。未反搏组血管异常为63.2％其中斑块形成占51.5％。体外反搏不仅可以改善各脏器血供；同时长期体外反搏，可以干预动脉硬化和斑块形成