大学物理"对分课堂"教学模式实践探索

随着社会发展对人才需求的变化,许多高等院校结合专业胜任能力培养,修订了人才培养方案.学时、学情等变化使传统的大学物理教学模式难以有效保障人才培养质量.本文针对教学中存在的问题,尝试运用对分课堂教学模式,改革大学物理课程教学,从教学内容、教学目标、教学资源和手段、教学活动、教学评价等方面设计了多项教学措施,并采用调查问卷对教学效果进行了评估,结合教学反思,展望了后续改革方向.     

基于聚类和高斯过程回归的超分辨率重建

在样本学习的思想框架下,针对图像超分辨率问题的研究,提出了数据聚类和高斯过程回归相结合的解决方法.使用K-means对数据进行聚类,在各类中利用高斯过程回归对样本库中高低分辨率图像之间的对应关系进行学习.根据得到的学习模型对需要处理的低分辨率图像所对应的高分辨率图像进行预测,有效地利用了高低分辨率图像之间的统计特性.实验结果表明该方法可以较好地改善超分辨率重建效果.     

运动载体姿态角速率对跟踪稳定性影响的分析

分析了运动载体横滚角速率对跟踪稳定性的影响,推导了运动载体在两维稳定系统中的误差及解决方法。阐述了利用运动载体横滚角速率,经过计算机程序运算,对方位进行补偿的控制技术。解决了运动载体在A-E天线座下,天线稳定跟踪目标的跟踪问题。实现了对载体的三维扰动的隔离,并给出了工程上的解决方法。     

猪胃蛋白酶原A基因cDNA的克隆及其表达

根据GenBank中发表的猪胃蛋白酶原A（pepsinogen）基因序列设计引物，采用RTPCR技术，成功获得了猪胃蛋白酶原A基因，该基因全长1240bp，将该基因克隆到表达载体pPIC3．5K的EcoRⅠ和NotⅠ酶切位点构建重组表达质粒，通过电转化方法将重组质粒转化毕赤酵母GS115，检测结果表明猪胃蛋白酶原A基因在毕赤酵母中得到了表达．     

Synthesis and Characterization of Novel Schiff Base Macrocyclic Compounds Containing Thiophene

Several novel Schiff base macrocyclic compounds containing thiophene were synthesized from d/ethyl 3,4-dialkoxythiophene-2,5-dicarboxylate, cyanuric chloride, diethylarnine and p-nitrophenol by reduction, oxidation, substitution and cyclization, and their structures were characterized by IR, NMR and electrospray ionization-rnass spectrorneter（ESI-MS）. The studies on their UV-Vis absorption spectra show that Schiff base rnacrocycles 6-10 have selective recognition for Fe^3＋.     

离子与尘埃相互作用对离子声波和尘埃声波的影响

基于流体力学方程和与时间相关的线性微扰理论,分析了尘埃等离子体环境中离子与尘埃粒子的相互作用对离子声波和尘埃声波的影响,结果表明两者间的相互作用使得离子声波变得稳定而使尘埃声波变得不稳定。     

不同吸光涂层对激光微织构加工性能影响研究

为了提高激光微织构加工效率和改善微织构加工质量,采用W-71s型喷枪在GCr15轴承钢表面分别喷涂用黑漆、水玻璃、黄料、磷酸锌和石墨制备的涂层。利用Nd:YAG激光加工机对其进行激光微织构加工,使用3维形貌分析仪对微凹坑的形貌进行了检测。结果表明,与无涂层试样相比,采用水玻璃和黄料涂层试样表面蚀除凹坑体积均增加,凹坑边缘熔渣体积均减少,其中黄料涂层表面蚀除凹坑体积增加了29.4%,水玻璃涂层凹坑边缘熔渣体积减少了64.9%;在一定条件下,复合涂层相比单一涂层具有更好的激光加工性能,其中黄料与水玻璃复合涂层的性能最为显著,与未经涂层的相比,凹坑蚀除体积增加了47.1%,凹坑边缘熔渣体积减少了43.2%。这一结果对提高激光微织构加工效率、改善微织构加工质量具有一定的指导意义。     

污水污泥的燃烧特性

通过对几种污泥样品进行热重分析,研究了污泥的燃烧特性,根据燃烧实验所得的热失重曲线,对几种污泥的燃烧过程进行了分析,对实验数据进行处理,采用Ｐｈａｄｎｉｓ法微分法相结合的方法确定了燃烧反应机理并求出了反应动力学常数Ａ和Ｅ。在燃烧的不同阶段,总反应速度控制因素不同。     

Multiuser cyclic shift keying spread spectrum underwater acoustic communication

Aiming at the problem of low data rate and high receiver complexity of existing direct sequence spread spectrum code division multiple access (DS-CDMA),a novel code division multiple access (CDMA) using cyclic shift keying (CSK) signaling,namely CSK-CDMA,was proposed for multiuser underwater acoustic communication.The proposed method used the cyclic correlation characteristic of spread spectrum signals with M-ary modulation to provide a higher data rate than conventional.Passive time reversal technology was employed to suppress inter-code interference between users and the co-channel interference.The quasi-orthogonality of spread spectrum code was used to improve the processing gain.Multiuser communications are demonstrated with lake experimental recorded data under the condition of 5.27 km distance and complex multipath interference.The data rate is 39 bit/s/user for 6 users with bit error rate around 10^-2～10^-4.     

Hybridization to an Anti-activated Platelet Monoclonal Antibody Enhances Fibrinolytic Potency on Urokinase

The B-chain of urokinase (UK) was covalently linked by disulfide bond to the Fab fragment of an anti-human activated platelet monoclonal antibody(SZ-51). The UKSZ-51 conjugate retained the original binding specificity of its parent antibody, and produced about a 5-fold enhancement in clot lysis in plasma over that of the urokinase in vitro. Whereas UK significantly decreased the concentration of fibrinogen in plasma clot assay supernatants, UK-SZ-51 did not.