浅谈工程制图系列课程的精细化教学

结合工程制图系列课程的教学实践，阐述了精细化教学的具体做法，指出精细化教学是提高教学质量的保证，并能提高学生综合素质和就业竞争力，教学效果良好。     

压浮煤机构的研制

介绍了适合国内焦化企业压浮煤机构的研制过程,分析了产品主要技术参数及指标,与同类产品技术水平做对比,阐述了具体的研制方案。     

大鼠大脑中动脉供血区梗死后小脑皮质GFAP mRNA动态表达

采用Longa大鼠大脑中动脉内栓线阻断法制备动物模型,用实时定量PCR法检测大鼠大脑中动脉闭塞后小脑皮质胶质纤维酸性蛋白mRNA的表达。结果显示,持续性大鼠大脑中动脉闭塞后,胶质纤维酸性蛋白mRNA在大鼠的小脑皮层有动态表达,第1天、第3天和第5天比对照组明显增高(P0.05),第7天、第10天和第14天比对照组明显下降(P0.05)。大鼠大脑中动脉闭塞后小脑皮质出现胶质纤维酸性蛋白动态表达,远离梗死灶的相关部位脑组织继发损害机制可能与神经抑制因子有关。     

用FDTD模拟分析高阶色散对光孤子传输的影响

利用时域有限差分方法（FDTD）求解含高阶色散效应的非线性薛定谔方程（NLS）,数值模拟结果表明：FDTD方法的计算结果与传统的分步傅里叶变换法的模拟结果完全一致,三阶色散效应使孤子脉座沿传播方向的右侧出现振荡,而四阶色散效应使孤子脉座双侧出现振荡,严重影响了孤子的传输。FDTD方法原理简单,易于编程,其随时间空间推进的方式可方便地给出了孤子传输的全过程。     

项目管理在煤炭实际生产中的作用

企业的持续发展,关键在于管理创新.煤炭企业更有多达50%的工作可以以项目的形式进行计划、组织、控制,因此项目管理是煤炭企业创新发展的平台.通过项目管理,可以使企业有针对性地进行资源配置,完成煤炭企业发展应完成的各项工作.     

A comparative study on source apportionment of polycyclic aromatic hydrocarbons in sediments of the Daliao River,China: Positive matrix factorization and factor analysis with non-negative constraints

Two receptor models,positive matrix factorization (PMF) and factor analysis with non-negative constraints (FA-NNC),were applied for source apportionment of polycyclic aromatic hydrocarbons (PAHs) in sediments of the Daliao River,China.The source profiles and source contributions derived from the two receptor models were comparable.For PMF,PAHs mainly came from coal combustion (43.3%),followed by biomass burning (24.3%),traffic emissions (16.7%) and coke oven (15.7%).As for FA-NNC,coal combustion (50.4%) was...     

Records of the East Asian winter monsoon from the mud area on the inner shelf of the East China Sea since the mid-Holocene

AMS¹⁴C dating and analysis of grain size, major elements and clay minerals were applied to Core MZ01 from the mud area on the inner shelf of the East China Sea. Based on the environmentally sensitive grain size, clay mineral and major element assemblages, the history of the East Asia winter monsoon since the mid-Holocene could be reconstructed. These three proxies, mean grain size (>9.71 μm), chemical index of alteration (CIA) and ratio of smectite to kaolinite in particular, show similar fluctuation patterns. Furthermore, 10 extreme values corresponding to the contemporary cooling events could be recognized since the mid-Holocene; these extreme values are likely to have been caused by the strengthening of the East Asia winter monsoon. The cooling events correlated well with the results of the δ¹⁸O curves of the Dunde ice core and GISP2, which therefore revealed a regional response to global climate change. Four stages of the East Asia winter monsoon were identified, i.e. 8300–6300 a BP, strong and unstable; 6300–3800 a BP, strong but stable; 3800–1400 a BP, weak and unstable; after 1400 a BP, weak but stable.     

An evacuation risk assessment model for emergency traffic with consideration of urban hazard installations

The Critical Cluster Model (CCM) is an optimization model assessing the evacuation risk on the scale of neighborhoods.The static evacuation risk in the CCM is measured by Bulk Lane Demand (BLD)-an index that solely depends on network structure and population of evacuees.The advantage of the CCM is having less input parameters and with relatively smaller computational cost.Moreover,the process of risk assessment by the CCM is a global optimization process.For this reason,the CCM provides a relatively ideal s...     

生活垃圾可堆腐物中的营养元素分析

通过对延安市区生活垃圾为期一年的采样分析,按照国家标准分析法,分别测定垃圾可堆腐物中的全氮、全磷和全钾的含量,并将这些元素含量值分别对垃圾可堆腐物中的厨余、塑料、织物和纸类组分的含量值作二次多项式逐步回归分析,确定最优回归方程以及影响全氮、全磷和全钾含量的主要因子,通过显著性检验,误差分析确定方程的准确性.结果表明:从单因素角度来看,在垃圾可堆腐物中,全氮的含量与厨余组分正相关,与织物组分负相关,且对全氮含量的影响程度为前者大于后者;全磷的含量与厨余正相关,厨余对全磷含量的影响在所有变量中最为显著;全钾的含量与塑料及纸类的含量正相关,对全钾含量的影响程度为纸类大于塑料.     

前端聚合法制备羟基磷灰石/聚丙烯酰胺复合材料

采用前端聚合技术制备了羟基磷灰石/聚丙烯酰胺(HAP/PAM)复合材料,并将其用于废水中重金属铅离子的吸附处理.研究了羟基磷灰石含量对聚合前端移动速度、最高温度以及铅离子吸附能力的影响,并用扫描电镜(SEM)对产物的微观结构进行了观测.结果表明前端聚合法不仅工艺简单、反应快、能耗低,而且制备的HAP/PAM复合材料为多孔结构,无机粉体在其中分散均匀,具有较强的铅离子吸附能力,用于废水处理具有明显的优势.