关于地方本科高校专业建设首席负责制的思考

专业建设是提高专业人才培养质量的重要途径。地方本科院校实行专业建设首席负责制是逐步建立和完善现代大学制度的需要,可充分调动高职称、高学历、高素质的教师参与专业建设的积极性。实施专业建设首席负责制,要选择合适的首席负责人,制定相关制度和保障措施。     

探《愚人船》之对话与癫狂

凯瑟琳·安·波特用平淡的语言叙述了《愚人船》中愚人随船漂流无以为家的末日景象。本文从对话与癫狂两个角度探讨了凯瑟琳·安·波特《愚人船》中人人对立的"愚人"主题。     

弧形齿联轴器承载能力的有限元分析

以弧形齿联轴器的齿轮副为研究对象,基于弧形齿的加工原理,对齿轮副内外啮合齿轮建立三维模型,再将模型导入有限元软件中,分析内外齿轮在不同轴间倾角下的应力分布,并对齿轮进行强度校核,最终得出弧形齿联轴器的承载能力与内外齿轮轴间倾角的关系。     

初探借助RFID电子标签实现农产品信息读写

随着信息化技术在我国的不断发展应用,RFID技术在农产品质量安全管理、农产品物流管理及农产品追溯体系中的应用也取得了一定的进展.在这些应用当中,核心的基础技术就是要借助RFID电子标签将农产品信息写入数据库或从数据库中读取出来,本文通过实例在实验平台上借助电子标签实现了农产品信息的快速读写.     

三次幂等算子线性组合的遗传性质

研究了幂等、对合、三次幂等算子线性组合的遗传性质;利用算子分块技巧,对这类问题所涉及的各种组合给出一个统一的证明;得到了交换三次幂等算子线性组合仍为三次幂等的充要条件;最后,讨论了所得结论的应用范围,推广、发展了原有的一些定理.     

减摇水舱晃荡运动数值模拟研究

减摇水舱是一种全航速下都能起到减摇效果的减摇装置,研究减摇水舱在晃荡运动过程中减摇力矩的变化规律,是一件很有意义的工作.首先,考虑到减摇水舱在晃荡运动的过程中水舱角的变化对阻尼系数的影响,将阻尼系数看作一个时变的函数;然后求解船舶-水舱系统横摇方程,计算不同频率简谐运动形式下,减摇水舱对于船舶提供的减摇力矩;最后应用CFD方法,对水舱在上述运动形式下的晃荡过程进行3D数值模拟,求得的减摇力矩与理论计算值比较吻合.该研究工作为减摇水舱减摇力矩的计算提供了一个新方法,同时也为下一步的研究奠定了理论基础.     

考虑再生粗骨料随机分布的混凝土氯离子扩散细观数值模拟

考虑粗骨料分布的随机性及氯离子结合的非线性对氯离子扩散性的影响,对再生混凝土中氯离子扩散进行数值建模与细观仿真分析,并将数值模拟结果与已有试验数据进行对比;通过改变老硬化砂浆扩散系数、新硬化砂浆扩散系数、老界面过渡区扩散系数及浸泡时间,对比研究了不同情况下再生混凝土中氯离子的扩散特性.结果表明:数值模拟结果与试验结果接近;再生混凝土中氯离子沿扩散深度方向呈波浪式下降;随着扩散系数的增大及浸泡时间的增长,氯离子扩散速度加快;随着再生粗骨料取代率的增加,氯离子扩散速度也增加;相同扩散深度处,不同随机骨料模型中氯离子含量最大值接近,说明所采用的随机骨料模型模拟结果具有较好的稳定性.     

基于相位交织的相控阵雷达通道幅相误差在线监测和校正方法

针对相控阵雷达天线通道间存在幅度和相位误差,使得天线系统性能恶化的问题,该文采用一种相位交织算法实时提取一维相控阵雷达天线阵元幅度相位值,实现了天线性能在线监测和校正;并利用提取的阵元幅相信息形成方向图,根据波瓣统计特征,对天线性能进行评估。仿真和试验数据验证了该文方法是有效可行的。     

Preparation and catalytic performance of Fe-SBA-15 and FeO x /SBA-15 for toluene combustion

High-surface-area and well-ordered mesopor- ous Fe-incorporated SBA-15 （xFe-SBA-15） and SBA-15- supported FeOx （yFeOx/SBA-15） with the Fe surface den- sity between 0.09 to 1.11 Fe-atom/nm2 have been prepared using the one-step synthesis and incipient wetness impregnation methods, respectively. Physicochemical properties of these materials were characterized by means of numerous techniques, and their catalytic activities for the combustion of toluene were evaluated. It is found that the xFe-SBA-15 and yFeOx/SBA-15 samples possessed rod- or chain-like morphologies. The Fe species were of high dispersion when the Fe surface density was lower than 0.76 Fe-atom/nm2 in xFe-SBA-15 and 0.64 Fe-atom/nm2 in yFeOx/SBA-15. At a similar Fe surface density and space velocity, the xFe-SBA-15 catalysts showed better activity than the yFeOJSBA-15 catalysts, in which the xFe-SBA- 15 catalyst with Fe surface density 0.59 Fe-atom/nm2 performed the best. It is concluded that the good perfor- mance of the xFe-SBA-15 sample with Fe surface density 0.59 Fe-atom/nm2 was associated with its large surface area, high Fe species dispersion, and good low-temperature reducibility.     

Observation of directional change of core field inside flux ropes within one reconnection diffusion region in the Earth’s magnetotail

Two consecutive magnetic flux ropes, separated by less than 30 s （△t 〈 30 s）, are observed within one magnetic reconnection diffusion region without strong guide field in the Earth＇s magnetotail by Cluster multispacecraft. The flux ropes are characterized by bipolar signatures of the south-north magnetic field component Bz accompanied with strong core magnetic field By, intense current J and density depletions inside of them. In spite of the small but non-trivial global scale negative guide field （-By）, there exists a directional change of the core fields of two flux ropes, i.e., -By for the first one, and ＋By for the second one. The directions of the core fields are the same as the ambient cross-tail magnetic field component （By） just outside of flux ropes. Therefore, we suggest that the core field of flux ropes is formed by compression of the local preexisting By and that the directional change of core field is due to the change of local preexisting By. Such a change in ambient By might be caused by some microscale physics.