Effect of Ni addition on the glass-forming ability and soft-magnetic properties of FeNiBPNb metallic glasses

The effect of Ni addition on the glass-forming ability (GFA) and soft-magnetic properties of an (Fe1-xNix)75.5B14.5P7Nb3 (x=0-0.6) alloy system were investigated. We found that the addition of Ni was effective in allowing the alloy to approach a eutectic point as well as increasing the thermal stability of the supercooled liquid. By increasing the amount of Ni,the supercooled liquid region (ΔTx),the reduced glass transition temperature Trg (Tg/Tl) and the Y parameter [Tx/(Tg+Tl)] increased from 49 to 75 K,0...     

老子思想对“专升本”高校图书馆人本管理的启示

“专升本”高校图书馆的管理现状存在许多弊端，可从现代管理理念与老子管理思想的契合点出发，提出优化馆员环境、强化组织文化建设、完善管理机制等改良措施与对策，以保证升格后的高校图书馆在与其它信息机构竞争中的优势地位。     

Surface pollen assemblages of human-disturbed vegetation and their relationship with vegetation and climate in Northeast China

Pollen assemblages of 53 surface pollen samples from farmlands and wastelands in Northeast China were analyzed. Tree pollen percentages were usually higher than 30%, with Pinus (26.9%), Quercus (0.9%), Betula (0.9%) and Populus (0.7%) as the major types, and herb pollen percentages were usually higher than 50%, with weedy Poaceae (8.7%), Chenopodiaceae (7.1%), Artemisia (1.9%) and Compositae (3.5%) as the major taxa. Thus, the pollen assemblages were consistent with the regional vegetation compositions. However, there were differences in pollen assemblages among regions, especially among different geomorphological units. For example, in the mountains, there were more types of tree pollen and higher total percentages (average 42%) than in other areas, while cereal pollen percentages were lowest (11.2%). In the hills and high plains, herbs made up more than 60% of the pollens, with cereals (average 53.6%) the dominant type. In the low plains, pollen types were similar to those in the hills and high plains, but total pollen concentrations and the proportion of Concentricystes were much higher, while cereal pollen percentages were slightly lower (average 41.6%). Pollen assemblages in different land use types also differed. For example, in farmland, cereal pollen percentages were more than 40% and Chenopodiaceae was usually less than 2.5%, while in wasteland, weedy Poaceae was usually less than 10% and Chenopodiaceae was usually higher than 25%. Total pollen concentrations in farmland (average 3909 grains/g) were much lower than in wasteland (average 15074 grains/g). Redundancy analysis revealed that pollen assemblages were significantly negatively correlated with mean annual temperature (-0.73) and July mean temperature (-0.81) and significantly positively correlated with mean annual precipitation (0.48), indicating that pollen assemblages in the artificial or human-disturbed vegetation reflect regional climate well. Comparison of pollen assemblages in different areas of northern China showed that pollen concentrations reflect the intensities of human impact to some degree. For example, pollen concentrations decrease as human impacts increase in intensity. The cereal pollen proportions in farmland differed by area. In Northeast China, cereal pollen proportions were distinctly higher than in most other areas of northern China, suggesting differences in planting habits and climate.     

流域水污染治理模式创新研究

我国严峻的流域水污染已成为可持续发展的严重威胁,而目前的流域水污染治理模式却难以有效地解决这一难题.针对流域水污染防治的管理体制、机制、政策体系所存在问题,提出了创新流域水污染治理模式的对策与方法.     

关于变精度粗糙集模型近似算子性质的一点注记

通过引进一对新的增值算子,对变精度粗糙集模型的部分性质进行推广,把并与交的β上下近似集之包含关系推广到相等关系(定理2).     

HDPE固相接枝丙烯酸的研究

以过氧化苯甲酰（ＢＰＯ）为引发剂、二甲苯为界面剂，研究丙烯酸（ＡＡ）在粉料高密度聚乙烯（ＨＤＰＥ）上的固相接枝反应．红外光谱证实了该接枝反应。Ｘ光衍射发现接枝后的ＨＤＰＥ结晶度下降不多，表明接核反应发生在ＨＤＰＥ的无定区域和晶区表面或晶区缺陷上。实验还发现，随着引发剂用量、ＨＤＰＥ颗粒度的增加，反应温度的升高，单体／聚合物比增加，接枝率提高。本研究制得的ＨＤＰＥ—ｇ—ＡＡ，其接枝率可高达１５．９２％。     

STM隔振系统的复模态分析

用复模态分析法求出了针对扫描隧道显微镜隔振系统的运动解和振幅传递函数的解析表达式，从该表达式可以看出，隔振系统第一级参数极大地影响着整个系统的隔振性能，然后用由本方法计算得出的三维和二维图象分析ＳＴＭ隔振系统，在悬挂弹簧加磁阻尼系统和金属块中夹橡圈系统的比较中，得出了一些有用的结论。     

壳聚糖的改性及改性壳聚糖膜的富氧性能

以ｒ－吡啶酰氯对壳聚糖进行化学修饰，并用修饰后的壳聚糖作为膜材料进行氧氮分离，结果表明，所制得的膜具有良好的机械性能，并具有一定的富氧性（表面含有一层水时）．考察了ｒ－吡啶酰氯和壳聚糖重复单元的摩尔比（Ｂ）、反应温度（Ｔ）、反应时间（ｔ），对壳聚糖上氨基酰化的影响，选择一最佳反应条件：Ｂ以２为宜，反应温度为８０℃，反应时间为７２ｈ。     

群钻钻削力研究：群钻钻削的流屑角模型的试验验证（Ⅱ）

通过钻削的流屑角试验，验证了群钻钻削的流屑角模型的可靠性。