Effects of Electrochemical Treatment on the Superficial Properties of Rayon-based Carbon Fibers

The development of surface acidity on rayon-based carbon fibers during mild electrochemical treatment was investigated. Conductimetric titration was the primary method used to investigate the functionalities on the carbon fiber surface. The acidity on the surface of the untreated carbon fiber was very low, while for the treated fibers, the acidity increased significantly. Moreover, with the treatment extent proceeded, the acidity on the fiber surface also increased. SEM analysis shows electrochemical treatment under intense treatment degree caused considerable etch on the fiber surface. Cavities and grooves can be observed on the surface via the SEM microphotograph. While in a more mild treatment, electrochemical treatment didn't cause great etch on the surface of the fiber.     

对《实验心理学》应用型示范课程建设的思考

以《实验心理学》教学工作实践为例，围绕教学理念、教学方法、教学内容等课程建设中的核心工作内容进行探讨，并就为何提出“学生中心，知行结合”的教学理念，及如何践行以发现式教学为主导的教学方法、强化教学内容的生成性等教学组织工作做了具体探讨。     

一种对特殊多维0-1背包问题的约束简化方法

针对一类组合优化问题—多维 0 - 1背包问题 ( MKP) ,这是一个 NP-难问题 ,提出一种能减少求解难度的方法—约束化简方法。定义了 MKP的紧约束的概念。提出了一种代替多约束组的计算方法。对于经过替换后所得到的新问题 ,证明了与其原问题解精度上的等价性。     

RH生产超低碳钢的工艺优化

通过建立ＲＨ真空处理脱碳数学模，研究了「Ｃ」０、「Ｏ」０、吹氩流量、浸入管内径对脱碳效果的影响，模型计算结果表明，针对某厂ＲＨ处理工艺，若适当提高转炉出钢「Ｃ」，降低出钢「Ｏ」，即可满足钢中「Ｃ」的要求，又可降低脱碳终点「Ｏ」从而减少脱氧合金的消耗。     

离散参数复值鞅的性质

引进离散参数复值鞅，借助于离散参实值鞅的性质，通过求条件数学期望，给出离散参数复值鞅的某些性质，给出离散参数复值鞅的实例。     

Photoluminescence from Ge-SiO2 thin films and its mechanism

Ge-SiO₂ thin films were deposited on p-type Si substrates using the radio frequency (rf) magnetron sputtering technique with a Ge-SiO₂ composite target. Films were annealed in N₂ ambience for 30 min at 300℃—1000℃ with an interval of 100℃. Through the X-ray diffraction, the average size of Ge nanocrystals (nc-Ge) was determined. They increased from 3.9 to 6.1 nm with increasing annealing temperature in the range of 600℃—1000℃. Under ultraviolet excitation, all samples emit a strong violet band centered at 396 nm. With the formation of nc-Ge, the samples exhibit another emission of orange band with the peak at 580 nm and its intensity increases with the increasing size of nc-Ge. The peak positions of two bands do not shift obviously. Experimental data indicate that the violet band comes from GeO defect and the orange band originates mainly from the luminescence centers at the interface between the nc-Ge and SiO₂ matrix.     

Rapid Expansion of Supercritical Solution of Poly (1,1,2,2- Tetrahy-droperfluorodecyl Acrylate)

Poly(1,1,2,2- tetrahydroperfluorodecyl acrylate) (poly (TA-N)) was synthesized in laboratory. The resulting morphology of rapid expansion of supercritical solution (RESS) sprays of poly(TA - N) was investigated. At apre - expansion temperature of 45℃), amorphous polymer was formed. At temperature around 60 ℃ to 80 ℃ , fibers were formed. Increase of temperature increasesparticle size slightly. At temperature of 105℃ , most of particles are spheres. The RESS is an attractive process. To apply the polymers desired for coating applications in an organic solvent - free process that is economically viable , and it will have implications for pollution prevention during polymer film formation     

化学镀制备SiC/Ni-P功能梯度材料

通过对化学复合镀Ｎｉ－Ｐ－ＳｉＣ复合镀层的研究，找到了制备ＳｉＣ／Ｎｉ－Ｐ功能梯度材料的工艺方法．并采用光学显微镜、电子探针分析仪、透射电镜等方法和手段对ＳｉＣ／Ｎｉ－Ｐ功能梯度材料的组织、形貌和成分进行了研究．结果表明，功能梯度材料的微观结构与材料成分梯度分布之间有很好的对应关系．     

区域可持续发展定量评估方法及其应用

提出了区域可持续发展水平和能力指标体系，给出了单项评价、权重确定和综合评价。根据1998年统计数据，对甘肃省临夏州7县1市的可持续发展水平进行了评估，并简述了发展对策。