Bluff body flow-induced noise control with sliding plasma actuators

Sliding plasma actuators were used to control the flow-induced broadband noise radiating from a bluff body. The structure consisted of a cylinder and a torque link that was installed on the lee side of the cylinder. The objective was to reduce the noise generated during the cylinder wake impinging on the torque link. By manipulating cylinder wake with the externally-imposed body force generated by the plasma actuators, the flow-structure interaction was reduced, leading to an attenuation of the broadband noise up to 3 dB in overall sound pressure level at a free stream speed of 30 m/s.     

高校开展阳光体育运动的影H向因素及实施路径研究

运用文献资料、问卷调查、数理统计等研究方法,采取帕累托分析截取影响高校开展阳光体育运动的8个因素,并针对性地提出了建立相关制度保障、推进体育课程改革、增强课外活动氛围、树立积极健康观念、加强师资队伍建设、加大场地器材投入、养成体育生活方式等实施路径,为高校阳光体育运动开展提供参考依据.     

浅谈建筑节能改造的防火问题

既有建筑节能改造是当前我国建筑节能工作的重点,但由于材料、施工、法规监管等多方面的原因,给我国建筑防火安全造成了许多重大隐患和事故。就如何在建筑节能改造中通过多种手段处理好防火安全问题进行了讨论,提出一些可供借鉴的方法。     

服装工程师人才培养模式的研究与构建

本文分析国家对工程人才培养的标准和要求,考虑企业对服装人才的需求,体现"突出基础,加强实践,注重创新,持续发展,提倡科技,重视生态,多样优化,国际视野"的学生培养指导思想,结合学校以工科为背景,以纺织服装为特色,及为纺织服装行业培养高级应用型专门人才进行定位,对服装专业的应用型工程师培养模式进行分析和研究,提出"3+1四模块"服装人才培养体系,完成课程体系、实践教学体系、企业培养方案构建,为全面提高服装人才的工程化培养提供了可行的实施办法.     

浅谈公共图书馆自动化的发展

阐述了图书馆自动化发展的历程,分析了国内图书馆自动化发展的现状及面临的问题,提出了图书馆自动化发展的建议。     

郴州市登革热媒介伊蚊种类与季节消长调查研究

目的调查了解郴州市登革热媒介伊蚊种类与季节消长。方法采用诱蚊灯诱蚊法对居民区、公园、医院的蚊虫进行监测，并对监测结果进行分析。结果主要调查到5种蚊虫，分别为淡色库蚊、三带喙库蚊、白纹伊蚊、埃及伊蚊和中华按蚊，其中淡色库蚊为优势种，占捕获总数43．79％。从生态观察点共捕获2263只蚊虫，雌雄比例为2．73：1。平均密度为3．49只／（灯·h），不同环境蚊密度为公园〉医院〉居民区。密度呈单峰曲线，7月下旬密度最高，达到7．67只／（灯·h）。结论初步掌握了郴州市蚊虫的种类与季节消长，为防治工作提供了科学依据。     

Self-alignment of full skewed RSINS：observability analysis and full-observable Kalman filter

Traditional orthogonal strapdown inertial navigation sys-tem （SINS） cannot achieve satisfactory self-alignment accuracy in the stationary base： taking more than 5 minutes and al the iner-tial sensors biases cannot get ful observability except the up-axis accelerometer. However, the ful skewed redundant SINS （RSINS） can not only enhance the reliability of the system, but also improve the accuracy of the system, such as the initial alignment. Firstly, the observability of the system state includes attitude errors and al the inertial sensors biases are analyzed with the global perspective method： any three gyroscopes and three accelerometers can be assembled into an independent subordinate SINS （sub-SINS）;the system state can be uniquely confirmed by the coupling connec-tions of al the sub-SINSs;the attitude errors and random constant biases of al the inertial sensors are observable. However, the ran-dom noises of the inertial sensors are not taken into account in the above analyzing process. Secondly, the ful-observable Kalman filter which can be applied to the actual RSINS containing random noises is established; the system state includes the position, ve-locity, attitude errors of al the sub-SINSs and the random constant biases of the redundant inertial sensors. At last, the initial self-alignment process of a typical four-redundancy ful skewed RSINS is simulated： the horizontal attitudes （pitch, rol ） errors and yaw error can be exactly evaluated within 80 s and 100 s respectively, while the random constant biases of gyroscopes and accelero-meters can be precisely evaluated within 120 s. For the ful skewed RSINS, the self-alignment accuracy is greatly improved, mean-while the self-alignment time is widely shortened.     

具有非线性恢复力和外力激励的Duffing-Van der Pol系统的谐波解

应用动力系统的分支理论和二阶平均方法,研究带非线性恢复力和外力激励的Duffing-Van der Pol系统随系统参数变化的谐波解分支,得到了谐波解和其分支存在的条件.     

早产儿视网膜病变高危致病因素的多因素分析

目的:回顾性研究早产儿视网膜病变(ROP)发生的高危致病因素。方法:对接受筛查的胎龄≤34周或出生体质量≤2 000 g的早产儿进行眼底检查,并对ROP高危致病因素进行多因素Logistic多元回归分析。结果:完成筛查的219例早产儿中,21例(42只眼)发生ROP,占9.6%,其中阈值病变6例(12只眼),占2.7%。单因素分析显示,ROP的发生与出生体质量、孕周、首次救治医院有无新生儿急危症监护室(NICU)、吸氧5 d、窒息以及贫血等6项高危因素有关;多因素Logistic多元回归分析表明,出生体质量、孕周、吸氧5 d、宫内窘迫等4因素与ROP发生有相关性。结论:ROP的发生与孕周短、出生体质量低和吸氧时间长等各致病因素间的综合作用有关。     

社会转型期大学生自我教育现状及其实现途径

加强和改进大学生思想政治教育关系到国家和民族的前途命运。随着社会转型的深入,针对大学生自我教育令人担忧的现状,笔者着重从社会转型的角度对其消极影响进行了原因分析,最后提出了四种可行的实现途径,即对话理解法,实现疏导结合;自我管理法,实现劳逸结合;体验激励法,实现知行结合;咨询调适法,实现防治结合。