浅议基于云计算的高校信息平台在学生工作中的应用前景

目前,高校的信息化建设初见成效,但高校学生工作的信息化发展仍有待提高。随着云计算的兴起,其特有的平台化、共享化、低成本化、安全化的特点使云计算成为解决目前高校信息化建设难题的突破口。本文首先阐述了当前高校学生管理中的各种矛盾;其次,介绍了云计算的特点和优势;最后,对云计算在高校学生管理应用前景进行了展望。通过本论文的研究,从云计算的视角对不断加快高校信息化建设提出了新的思路。     

2012–2014 China's Earth Observation and Earth Science Development

Human beings are now facing global and regional sustainable development challenges.In China, Earth observation data play a fundamental role in Earth system science research. The support given by Earth observation data is required by many studies, including those on Earth's limited natural resources, the rapid development of economic and social needs, global change, extreme events, food security, water resources, sustainable economic and urban development, and emergency response. Application operation systems in many ministries and departments in China have entered a stage of sustainable development, and the State Key Project of High-Resolution Earth Observation Systems has been progressing since 2006. Earth observation technology in China has entered a period of rapid development.     

Evolution analysis of a UAV real-time operating system from a network perspective

With the flourishing development of Unmanned Aerial Vehicles (UAVs), the mission tasks of UAVs have become more and more complex. Consequently, a Real-Time Operating System (RTOS) that provides operating environments for various mission services on these UAVs has become crucial, which leads to the necessity of having a deep understanding of an RTOS. In this paper, an empirical study is conducted on FreeRTOS, a commonly used RTOS for UAVs, from a complex network perspective. A total of 85 releases of FreeRTOS, from V2.4.2 to V10.0.0, are modeled as directed networks, in which the nodes represent functions and the edges denote function calls. It is found that the size of the FreeRTOS network has grown almost linearly with the evolution of the versions, while its main core has evolved steadily. In addition, a k-core analysis-based metric is proposed to identify major functionality changes of FreeRTOS during its evolution. The result shows that the identified versions are consistent with the version change logs. Finally, it is found that the clustering coefficient of the Linux OS scheduler is larger than that of the FreeRTOS scheduler. In conclusion, the empirical results provide useful guidance for developers and users of UAV RTOSs.     

植物细胞响应重力变化的Ca2+信号

重力大小的改变(微重力和超重力)可以对植物的生长发育、生理生化特性、细胞超微结构、基因和蛋白的表达等产生广泛的影响,而Ca~(2+)可能在此过程中起信号物质的作用.重力刺激在植物细胞中引发事件的顺序可能是:重力刺激的感受—细胞膜系统张力改变—膜理化特性改变—膜透性、离子转运、膜连接酶活性等改变—Ca~(2+)信号的产生和转导—新陈代谢变化—生理反应.植物对重力水平变化应激响应的至关重要一步是引起细胞内Ca~(2+)分布区域和浓度的变化,这是将细胞外重力刺激转换为细胞内化学信号的关键步骤.由于机械力敏感的C~(2+)通道的活化和Ca~(2+)-ATPase酶活性受到抑制,重力改变时细胞质中自由Ca~(2+)浓度增加,随后Ca~(2+)作为第二信使介导相关酶活性发生改变,最终引起一连串的生理生化反应.本文探讨了重力变化对植物细胞质内自由Ca~(2+)浓度的影响、Ca~(2+)信号的产生机制.以及Ca~(2+)作为次级信号对细胞生理生化过程调节作用的途径和机制,介绍了常用的Ca~(2+)研究方法,并分析了研究的关键点和难点.     

某型飞机滑跃起飞性能仿真分析

介绍了滑跃起飞的原理和运动特点,描述了滑跃起飞的关键数学模型。以某型飞机为例,计算了不同构型下飞机的起飞性能。最后分析了滑跑距离、起飞重量和杆配平量对滑跃起飞性能的影响,并结合试飞数据给出相关结论。     

旋转CVI制备陶瓷基复合材料碳界面层

用旋转ＣＶＩ工艺，通过优化工艺参数，在低压（５ｋＰａ）、高温（１１００℃）、高Ｃ３Ｈ６ 浓度（６２．５ｖｏｌ％ ）以及３．５ｍ ｍ ·ｍ ｉｎ－ １ 碳布旋转线速度条件下，在二维碳布上快速制备了厚度均匀（０．２５μｍ ）、表面规整的致密热解碳界面层。实验结果表明：沉积温度对界面层表面状况有较大的影响；采用减压法与优化沉积炉结构与几何尺寸，能有效防止高温高Ｃ３Ｈ６ 浓度下炭黑的形成。     

一种民用飞机液压系统自增压油箱容积计算方法

选择合适的油箱容积是保障液压系统正常工作的必要前提，为了能够合理计算民用飞机自增压油箱的容积，基于SAE AS5586 飞机液压系统油箱通用设计要求，介绍并分析飞机液压系统工作中作动筒、蓄压器以及油液物理特性等所产生的变化容积的计算方法，提出一套循序渐进的油箱容积计算方法以求得油箱设计所需的各类容积值；以某型飞机液压系统油箱容积计算为例，通过对极冷极热天气条件下各飞行阶段的油量分析，并和机上油箱油量记录曲线对比，验证提出的容积计算方法的有效性。结果表明：该型飞机液压系统油箱容积在全飞行阶段均能满足要求，本文所提油箱容积计算方法可行，可用于类似液压系统油箱容积计算。     

谈高校计算机机房的科学管理

计算机机房的管理是一门综合性的技术管理，它涉及到方方面面的问题，如机房内计算机的布局、网络布线、机房环境及用电安全、机房的防火防盗、计算机软件的安装、计算机硬件故障的检测和维护、机房实验人员的管理、学生的上机管理等等。科学地管理好计算机机房是关系到教学和科研工作顺利进行，有效地发挥设备功效的重要前提。     

民航高技能人才培养现状调查分析

通过对广州民航职院1100余名学生的问卷调查,了解了学生对高技能人才的认识情况,掌握了民航高技能人才在培养目标、专业设置、课程结构、教学改革、师资水平的培养现状及存在的问题,并针对调查结果,提出了加强民航高技能人才培养的对策与建议。