案例教学模式探究

案例教学是一种有效结合理论教学与实践教学的教学方法,是现代高校教育中不可缺少的教学方法。本文介绍了案例教学的特征、案例教学过程中教师的教学方法和注意事项、学生的学习方式、以及实施案例教学的优势,对案例教学的具体实施提出了实效性的方案。     

案例教学模式探究

案例教学是一种有效结合理论教学与实践教学的教学方法,是现代高校教育中不可缺少的教学方法.本文介绍了案例教学的特征、案例教学过程中教师的教学方法和注意事项、学生的学习方式、以及实施案例教学的优势,对案例教学的具体实施提出了实效性的方案.     

浅谈在高职高专教学中教会学生思维

文章通过对高职高专教学中引入思维方法教学的作用和意义进行分析，阐述了一种在教学中引入思维方法教学的一种新的教学理念。     

独立学院实践教学模式改革初探——以广西八所独立学院为例

论文在理解实践教学模式内涵的基础上，从学分设置、教学安排、教学方式等方面分析了广西独立学院实践教学的现状，并从实践教学体系、大型实践教学、课程内实践教学、特殊实践教学等层面提出了新的教学模式建议。为独立学院实践教学模式改革提供参考。     

推进实践教学改革培养高层次应用人才

通过对北华航天工业学院实践教学现状的分析，提出了在理论教学与实践队伍教学的结合、实践教学的队伍建设及制度建设、毕业设计、实习和课外科技活动等方面加强实践教学的具体措施。     

本科模拟电路理论及实验课程教学内容和教学方法的改革与实践

本文主要介绍了模拟电路课程改革的内容和方法：首先是改革陈旧的思想观念、把本科电路教学立足点定位在培养学生成为高素质的应用型人才；在教学过程中坚持基本概念、基本电路和基本应用；精心组织教学内容。灵活调整教学顺序，把理论教学和实践教学有机的结合在一起；采用提问式与启发式相结合，讲授与讨论式相结合的教学方法；利用多媒体CAI课件辅助教学，计算机辅助教学和黑板教学相结合，集中上课和学生白学相结合；实践教学和理论教学并重，实验内容由验证型转向设计型，由单元型转向综合型，实验时间也由分散型转向相对集中型，开设虚拟实验，增加趣味性实验内容等。这些措施的采用都使教学收到良好效果。     

对CAI教学手段的探讨

本文以《模拟电子线路》的CAI教学为基础，论述了CAI教学的优点、推广CAI教学的经验、以及使用CAI教学手段中教学方法的研究。     

管理学课程的案例教学实践

论文结合作者的实际教学经验，阐述了案例教学的基本原理及案便教学的教师组织工作，并介绍了一个教学实例。     

将素质教育融入数学多媒体课件的尝试——一元多项式的除法的CAI课件教学案例

目前，广大教师都在尝试用计算机辅助教学，尝试制作各种多媒体（CAI）教学课件。这些课件确实为提高教育教学质量起了很好的作用。但其中也有不少课件只追求形式上的华丽而忽视了在教学中所起的作用，或者只是简单地将多媒体当成“黑板”使用。如何恰到好处地发挥多媒体的各种优势，使制作的课件最大限度地提高教育教学的效果？这是很值得我们思考的问题。结合笔者的教学实践体会，就是在使用现代化教学手段的同时，很重要的一点是将我们教学者本身的教学思想、教学目标和教学艺术融入课件之中，在于将素质教育融入课件之中。     

关于高校教学秘书工作的探讨

教学秘书是高校教学管理中的基层人员,是教学工作正常运行的枢纽,其个人素质、知识结构、服务水平对高等教育的改革和发展存在一定影响。论文阐述了高校教学秘书的工作职责,分析了教学秘书队伍存在的问题,进而将"以人文本"的教育管理理念引入到教学秘书队伍建设中,从高校应重视秘书工作和教学秘书应爱岗敬业两方面提出建议,不断加强教学秘书自身素质,以保证教学工作的顺利开展。     

Venus transfer design by combining invariant manifolds and low-thrust arcs

The design of interplanetary trajectories based on patched circular restricted three body models is gradually becoming a valuable alternative to the classical patched conic approach. The main advantage offered by such a model is the possibility to exploit the manifold dynamics to move naturally far from or toward a body. Generally, propulsive maneuvers are required to match these structures. Low-thrust arcs offer the possibility to have a significant propellant mass reduction when moving from manifold to manifold. The aim of this paper is to present a methodology to design low-thrust trajectories between two planetary orbits connecting the manifolds of two circular three body systems. The approach is based on a grid search on the main parameters governing the solution to identify those trajectories moving within the manifold images on given Poincarè sections. The value of the Jacoby constant of the target libration point periodic orbit is chosen as stop condition for the thrusting phases. Ballistic arcs follow up to the proper Poincarè section intersection. A grid search for an Earth to Venus transfer is presented as test case.     

导弹协同攻击编队自适应滑模控制器设计

Aimed at the need of formation control of missile cooperative engagement, the adaptive sliding mode control theory is introduced to solve the controller design problem of formation based on the leader follower approach. Feedback precise linearization based on differential geometry theory is used to linearize the nonlinear motion model of missile and system model with follower track errors is formulated. In traditional leader follower approach, if the leader moves too fast due to the control saturated, the followers will not be able to track the desired position to keep formation. In order to overcome the disadvantage, an idea of speed control for the leader is introduced to guarantee formation keeping. Finally, an adaptive sliding mode controller is designed to overcome the problem of control input constraints. Theoretical analysis demonstrates that tracking error asymptotically converges to zero. Simulation results show that the leader is able to follow the desired path and the controller can help every missile configure desired formation. The simulation results verify stability and robustness of the formation controllers.     

加强高校数字化信息资源建设的几点思考

信息资源是教育信息化的关键,随着近几年高校信息资源建设工作的开展,影响和制约信息资源建设的诸多因素逐渐显现。加强高校信息资源建设,明确建设的组织与管理,正确处理知识产权问题,提高建设队伍人员素质,建立相应的鼓励和评价机制,对于推动信息资源建设的进程具有重要意义。     

待发段火箭倾倒实时监测技术研究与实现

倾倒故障作为火箭待发段的一种故障形式，严重地威胁着航天员的安全。待发段倾倒应急救生的关键在于及时获取准确可靠的箭体姿态与倾倒信息，为指挥员实时提供可靠的逃逸判决依据。本文从应用角度，综合光学与计算机图像处理技术，提出了一种简单而实用的火箭倾倒监测技术，并简要介绍了应用此技术实现的系统主要功能结构与性能特点。本文介绍的技术也可应用于其他需要定位与姿态监视测量的领域。     

载人航天器生活舱内湿度场的稳态数值模拟

研究载人航天器生活舱内部的湿度情况具有重要意义。由于生活舱设备外形和结构相当复杂,难以建模,因此按照速度梯度、湿度梯度较大的优先原则,合理选择简化舱体结构及舱内设备。采用基于有限元网格的控制容积法对计算区域离散,对离散方程组求解得出水汽质量浓度分布后,结合舱内温度场通过一定的转换关系最终得到了生活舱内部的湿度分布。数值分析结果表明生活舱内处于相对湿度较高的状态下,提示还需进一步采取措施以改善舱内湿度水平。     

浅谈发挥低年级学生学习英语的积极性

英语教学，特别是低年级英语教学既需要教师的积极性，更需要学生的积极性，二者缺一不可。要想发挥学生的学习积极性，首先应发挥英语自身的魅力，启发学生的积极性；其次，以情感促教学调动学生的积极性；再者，采取有效措施巩固学生的积极性。     

结构局部刚度变化对小卫星动特性影响

首先针对模块式小卫星动特性进行灵敏度理论分析，分析目标是寻找提高结构动特性的局部位置和参数。然后基于有限元法分析改变局部刚度对结构动特性的影响。小卫星结构动特性分析计算的主要问题是建立计算成本可控的有限元模型，本文详细讨论了小卫星有限元模型建模方法和简化途径，并通过7个算例考察改变模块底板局部刚度、改变适配器支撑刚度、模块问设置弹簧模拟阻尼器等对小卫星结构动特性的影响。灵敏度分析和计算表明，影响动特性的主要因素是模块盒底板刚度和星箭适配器的支撑刚度；增加模块局部刚度以及适配器支撑刚度可以屏蔽星体摆动和包带联结部位的某些频率，同时可以减缓部分中间模块的振幅；在部分模块间设置弹簧可以模拟阻尼器或减振器的效果。另一方面，降低适配器刚度可以增加隔振作用。因而优化模块刚度分布和支撑刚度分布是改进动力学性能的有效途径。本文分析为模块式小卫星动力学修改以及多功能结构设计和主动振动设计提供依据。     

火星大气来流模拟装置CFD仿真与试验

根据我国火星着陆巡视器工作过程,其着陆发动机需要在相对火星大气高速迎风运动中可靠点火。由于巡视器着陆时发动机喷管出口气流与火星稀薄气流方向相反,目前无法通过理论计算准确获得着陆过程的动态流场对发动机起动过程的影响量值。为验证火星着陆环境下发动机点火的适应性,需要建立发动机的火星大气来流试验环境模拟条件。为模拟发动机在火星大气条件下的相对运动,在真空舱内发动机保持固定,前端设置环形来流形成装置,该装置在发动机喷管周围形成一定速度的逆向来流包络。采用数值模拟技术结合试验验证方法,在火星着陆器巡视器主发动机性能考核试验中,针对来流的形成装置开展了设计研究工作。来流模拟试验测试数据表明:在确保贮箱供应压力稳定的条件下,来流模拟系统能够形成100~200 m/s速度的稳定来流,发动机在来流下能稳定启动工作,真空舱压力满足试验要求。     

Rats in a transparent morris water maze use elemental and configural geometry of landmarks as well as distance to the pool wall

The aim of this study is to evaluate whatare the dimensions of a panorama of discretelandmarks that a rodent will store in order toreturn to a previously visited target. Ratswere trained to locate a hidden platform in acircular pool of clouded water set within aquasi-spherical enclosure. In order to find theplatform, they had to learn the geometricrelations between the platform and asurrounding set of three discrete landmarks,highly visible through the transparent wall ofthe pool. In test trials without a platform,the array of landmarks was so manipulated as todissociate the effect of actual distance to thelandmarks, of their angular separation, and oftheir apparent dimension. Animals were shown torely equally on angular separation and apparentdimension. The role of actual distance couldnot be definitely ascertained, as animals wereshown to additionally rely on the distance tothe pool wall in order to locate theplatform.     

The BOSS and BIOMEX space experiments on the EXPOSE-R2 mission: Endurance of the desert cyanobacterium Chroococcidiopsis under simulated space vacuum,Martian atmosphere,UVC radiation and temperature extremes.

The proposed space experiments BOSS (Biofilm Organisms Surfing Space) and BIOMEX (BIOlogy and Mars experiment) will take place on the space exposure facility EXPOSE-R2 on the International Space Station (ISS), which is set to be launched in 2014. In BOSS the hypothesis to be tested is that microorganisms grown as biofilms, hence embedded in self-produced extracellular polymeric substances, are more tolerant to space and Martian conditions compared to their planktonic counterparts. Various microbial biofilms have been developed including those obtained from the cyanobacterium Chroococcidiopsis isolated from hot and cold deserts. The prime objective of BIOMEX is to evaluate to what extent biomolecules are resistant to, and can maintain their stability under, space and Mars-like conditions; therefore a variety of pigments and cell components are under investigation to establish a biosignature data base; e.g. a Raman spectral library to be used for extraterrestrial life biosignatures. The secondary objective of BIOMEX is to investigate the endurance of extremophiles, focusing on their interactions with Lunar and Martian mineral analogues. Ground-based studies are currently being carried out in the framework of EVTs (Experiment Verification Tests) by exposing selected organisms to space and Martian simulations. Results on a desert strain of Chroococcidiopsis obtained from the first set of EVT, e.g. space vacuum, Mars atmosphere, UVC radiation, temperature cycles and extremes, suggested that dried biofilms exhibited an enhanced survival compared to planktonic lifestyle. Moreover the protection provided by a Martian mineral analogue (S-MRS) to the sub-cellular integrities of Chroococcidiopsis against UVC radiation supports the endurance of this cyanobacterium under extraterrestrial conditions and its relevance in the development of life detection strategies.