Ce_(0.6)Zr_(0.4)O_2/γ-Al_2O_3复合粉体的制备及其结构研究

以氯氧化锆、硝酸铈、硝酸铝为原料,采用化学沉淀法在经过扩孔处理的γ-Al2O3基载体上制备出Ce0.6Zr0.4O2/γ-Al2O3复合粉体。为有效去除水分,减少粉体团聚,采用正丁醇与粉体共沸蒸馏。采用XRD技术对所得粉体的晶型及相结构进行了表征。结果表明:Ce0.6Zr0.4O2/γ-Al2O3复合粉体中CeO2为立方晶型,随着焙烧温度的升高,样品的衍射峰依次变强,半高宽变窄,说明晶粒变大,晶体的完整性变好。     

钢桥面环氧沥青铺装的界面行为

通过引入一个新参数膜劲度,在部分共同作用原理的基础上,建立了描述钢桥面环氧沥青混凝土铺装复合梁在负弯矩作用下的界面行为模型,用以分析钢-环氧沥青混凝土之间的界面滑移与应变.推导了弹性工作状态下复合梁的界面滑移与应变的表达式,编制了数值计算程序并用2根复合梁进行了校核.然后采用该程序分析了界面滑移与应变沿复合梁纵向的分布特征,以及铺装层中的最大拉应力、层间剪应力对材料参数的敏感性.结果表明,界面效应削弱了钢桥面铺装复合梁的整体抗弯刚度;中低温条件下,采用劲度更大的粘结层材料有利于改善沥青铺装层的受力;粘结层的损伤累积将加剧沥青铺装层的破坏.     

木质纤维素降解菌系的筛选及其降解特性

旨在为秸秆类木质纤维素沼气工业化奠定科学基础,以滤纸作为纤维素材料对不同发酵原料和发酵时期的沼气池菌系进行驯化和筛选,并研究其中温条件下对麦秸、玉米秸和滤纸的降解特性.采用减重法、分光光度法和蒸馏法分别测定复合菌系在发酵过程中的纤维素降解能力、复合菌系生物量和发酵液中挥发性有机酸.结果显示：发酵原料和发酵时期的菌源纤维素降解能力有较大差异,来自粪便池源的复合菌系在发酵前期纤维素降解力强,而秸秆池源的复合菌系在发酵后期纤维素降解力强.粪源产气稳定期的复合菌系F6的降解能力最强,对纤维素降解能力由高到低依次为滤纸、麦秸和玉米秸.     

Open plan

This study reports on an investigation into the impact of strategy-based English language instruction (SBELI) on the language proficiency of gifted learners. The participants were students who were identified as gifted and thus received additional out-of-school training for a few days a week in Adana Science and Arts Centre. Their ages ranged from 10 to 13. One experimental group (n = 17) and one control group (n = 17) were designed to explore the possible English performance differences between the learners who were exposed to SBELI, which included 11 language-learning strategies for eight weeks, and those who were not. Data were collected through proficiency exams, written accounts of participants in the experimental group, think-aloud protocols and an open-ended questionnaire. The findings obtained revealed that SBELI produced a positive impact on the language proficiency of the gifted students and enabled them to enhance their already established attitude to make their language learning quick, easy, effective and enjoyable.     

原位冶金法制备 WC／Ni 复合材料的形貌特性及性能研究

研究了采用直流电弧原位冶金技术制备 WC ／Ni 复合材料的方法和组织性能。试验结果表明,生成的WC 颗粒在制备的 WC ／Ni 复合材料的底部和顶部中的分布和尺寸都不同,底部分布较少并成散乱分布,尺寸达到100～200μm;顶部分布较多且有序分布,尺寸为10～20μm。基体为 Al0．9 Ni4．22相且硬度整体一致,WC 组织颗粒的宏观形貌为三棱柱,微观则为层片状结构,且其硬度根据所处位置不同而有一定变化,最大值可达到2331.99 HV。     

Socioaffective Issues and Concerns Among Gifted Filipino Children

There is a dearth of information regarding the socioemotional realities of gifted children from ethnically diverse backgrounds, which this research attempts to address. Multiple semistructured narrative interviews were conducted with 22 intellectually superior children aged 4–9 years and with their parents. Manifestations of perfectionism, hypersensitivities, and overexcitabilities were evident among the Filipino gifted children. The implications of such manifestations of heightened sensitivities for educators and diagnosticians were discussed. Cross-cultural contrasts were likewise discussed to demonstrate whether predominant socioaffective traits, characteristics, and issues in the West are likewise evident among gifted children from a culturally different background like the Philippines.     

外包钢-混凝土连续组合梁的负弯矩极限承载力(英文)

对2根外包钢-混凝土连续梁试件进行了静力加载实验研究与承栽力分析.测量并分析了试件的荷栽-挠度及荷载-应变关系曲线.结果表明:外包钢-混凝土组合梁负弯矩区钢筋和外包钢梁通过抗剪连接措施能有效地共同工作,整体工作性能良好.在承栽能力极限状态,负弯矩和正弯矩最大截面的塑性应变均充分发展,并形成比较理想的塑性铰.随着配筋率的提高,组合梁受弯承栽力明显提高,而延性和转动能力相应降低.在试验数据基础上,给出了外包钢-混凝土组合梁在负弯矩区极限受弯承载力的计算公式,计算结果与实验结果吻合良好.     

Preparation and characterization of TiO2/expanded graphite

In order to obtain anatase TiO2/expanded graphite with high expansion volume, titania gel was introduced to expandable graphite surface by sol-gel process, and then the composite was expanded and calcined at high temperature. The samples were analysed by using scanning electron microscope (SEM), X-ray diffraction(XRD), energy disperse spectroscopy(EDS), and differential scanning calorimetry(DSC). The optimal conditions for preparation are as follows: the molar ratio of tetrabutyl orthotitanate to triethanolamine is 1∶0.4, and the calcination and expansion temperature is in the range of 650-750 °C. Under such conditions, the expansion volume of composites could reach 98 mL/g, and the mass loss ratio is less than 5%. The analysis shows that lower temperature and smaller particle size of graphite are helpful to the formation of anatase-type of TiO2, but larger particle size will lead to lower mass loss ratio, and higher temperature and larger particle size will lead to higher expansion volume.     

二氧化硅增强石英纤维复合材料高温电性能温度特性

运用静电学理论,建立计算二氧化硅增强石英纤维复合材料介电参数的经验模型,实现材料高温介电性能的温度特性模拟,并对材料介电性能的变化规律作出预测.模拟结果与实际结果基本相符,为材料改性提供依据.     

发展超常教育需要解决的三个问题

大多数的文化都重视人的才智,然而,很少有国家能够形成持久的文化氛围让这种才智自由发展。缺乏通用定义,过分强调超常学生的学习成就以及缺乏相关的学术研究和评价机制是造成这种困境的原因。要营造超常教育文化氛围,需要找到天赋、天才以及创造力等概念的通用定义;同时,必须承认天才是一个多层面的复杂概念而非仅仅是学习成就上的或者认知性的。另外,必须有效地做好成果的评估工作以及超常儿童的扎实培育和后天开发工作。