44 research outputs found

    Research on Modeling and Control Technology of Unmanned Gyroplane

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    自转旋翼机是一种依靠空气来流驱使旋翼自转提供升力的旋翼类飞行器,具有机械结构简单、经济成本低、飞行安全性好等特点,有着广阔的应用前景。旋翼机理论建模置信度较低,空中飞行纵横向/高度速度控制耦合强,起降有其自身的特点与难点。本文研究了基于参数辨识的自转旋翼机建模技术,开展了全自主飞行控制的设计,进行了基于FlightGear平台的起降仿真,并实现了飞行演示验证。本文的主要研究内容如下: 本文开展基于有人操纵主动激励的气动参数辨识技术的自转旋翼机建模方法。合理设计有人驾驶旋翼机飞行参数采集方案,经过相干性简化模型结构、辨识精度评估以及时域模型验证,基于时域线性回归和频域方程误差的参数辨识算法获得...Rotary rotorcraft is a rotor-type aircraft that relies on the air to drive the rotor to rotate. Because of the gyroplane characteristics of simple mechanical structure, low economic cost and good flight safety, the unmanned gyroplane has wide application prospect. However, gyroplane theory modeling confidence is low, vertical/horizontal and hight/speed control coupling is strong, take-off/landing ...学位:工学硕士院系专业:航空航天学院_工程硕士(仪器仪表工程)学号:3202014115286

    Chinese Translation of Chapter Six to Chapter Ten of Thieves Like Us and An Analysis of the Translation

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    爱德华•安德森是少数能将美国大萧条时期底层人群的生活真实地描绘出来的作家之一。他的小说《像我们一样的盗贼》反映了那个时代处于社会底层的人群的彷徨和迷茫。这本小说真实笔法耐人寻味,这也是本文作者选择其作为翻译原文的原因。《像我们一样的盗贼》一共有二十五章,第六章到第十章展示了三个主人公抢劫银行全过程及其内心世界。在这简练的五章中,读者能找到他们想要了解的一手材料,比如,主人公的生活经历、抢劫银行的动机以及他们的矛盾的情感世界等。选定作为翻译原文的这五章反映了三位鲜活个性的人物,当然也反映了当时的时代特征。 该小说的翻译过程也是一场感受之旅——感受“盗贼”的人性、感受底层人群的世界,...Edward Anderson was a brilliant story-teller who had painted a picture of restless life of lower class during the Great Depression. His second and last published novel Thieves Like Us is a classic portrait of small-time Depression era bank robbery. There are twenty-five chapters of this novel, with chapter six to chapter ten telling what happened when the three protagonists robbed banks. All that ...学位:翻译硕士院系专业:外文学院英语语言文学系_英语语言文学学号:1202009115233

    The legal risks and countermeasures of China's commercial banks listed shares on oversea markets

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    近年来,越来越多的我国商业银行开始试图在境外资本市场进行股票上市。对于商业银行的境外上市,许多学者都进行了相当深入的理论和实证研究,尤其是对境外上市的必要性以及利弊大小的分析,这对我国商业银行境外上市的实际操作具有极高的价值和意义。但是,这些研究似乎还只是局限于对境外上市的金融风险分析,对法律风险的研究则相对较少。在这一前提背景下,本文试图通过探索银行境外上市的法律风险,使我国商业银行准确把握机遇,避免可能产生的不必要的经济损失和诉讼风险,从而增强商业银行在国际市场的竞争力。本文总共分为三章。第一章首先回顾了目前商业银行境外上市的现状以及涉及的相关理论,然后从整体上说明了商业银行境外上市可能面...In recent years, more and more China's commercial banks started to trying to listed shares on oversea stock markets.There were lots of scholars have had considerable degree of theoretical and empirical researches on commercial banks’listed shares on oversea markets, especially on the necessities, the pros and consors of listed shares on oversea markets, which is of great value and significance on ...学位:法律硕士院系专业:法学院法律系_法律硕士(JM)学号:1292006115057

    浅谈企业业绩评价体系

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    随着"新经济"的来临,企业进入战略经营时代,企业间的竞争表现为长期、综合竞争能力的竞争,绩效评价作为企业计划与控制的有机组成部分,越来越来越受到企业的关注。该文认为由财务指标组成的传统的财务业绩评价指标体系已无法满足经营管理的需要,企业应引进非财务指标,而战略平衡记分卡的出现进一步丰富和完善了经营业绩评价指标体系,文中对平衡计分卡进行了描述并提出了几点改进建议

    专题情报数据管理与智能分析平台的构建

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    [目的/意义]面对多学科领域、多类型用户的专题情报服务需求,建立专题情报数据管理与智能分析平台。实现专题情报分析的流程化和智能化,同时对融入专家智慧的专题情报分析过程数据进行管理,丰富服务模式,提升服务需求响应速度。[方法/过程]在调研已有相关研究与实践分析基础上,提出平台设计思路、建设框架,对平台主要功能和关键技术进行剖析。[结果/结论]专题情报数据管理与智能分析平台已建设完成。平台集成了多来源多类型数据,打通了从数据到分析的服务链条。嵌入了多种情报分析方法和深度学习算法,实现了多维多层次分析服务。能够对分析过程和情报分析人员历史积累数据进行管理,实现数据共享和重复利用。</p

    Study on HPLC Fingerprint of Chinese Marine Medicine Dried Scallop

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    目的建立海洋中药干贝高效液相色谱(HPlC)指纹图谱分析方法 ,为其质量控制和药材鉴别提供依据。方法采用反相AllTIMA-C18柱,水(A)和乙腈(b)为流动相,梯度洗脱,流速为0.8Ml/MIn,检测波长210nM,柱温20℃,进样体积30μl;采用高效液相色谱二极管阵列检测器-质谱联用技术(HPlC-dAd-MS)对其特征峰进行快速分析;采用相似度计算软件用于10批干贝药材的相似度评价。结果初步建立了干贝药材的HPlC指纹图谱,10批干贝药材指纹图谱有9个共有峰,相似度均在0.85以上;HPlC-dAd-MS分析获得的4个特征峰的紫外光谱和质谱信息,可用于干贝药材指纹图谱特征峰以及共有峰的准确确定。结论该方法准确、简单、稳定性好,为干贝药材的真伪鉴别及质量控制提供了科学依据。Objective To establish a chromatographic fingerprint of Dried Scallop,a kind of Chinese marine medicine,by high performance liquid chromatography (HPLC),and apply for quality assessment and control of medicine materials of Dried Scallop.Methods Separation was performed on an Alltima-C18 (250 mm × 4.6 mm,5μm),with mobile phase consisting of water (A) and acetonitrile (B) with gradient elution at the flow rate of 0.8 ml/min.The UV detection wavelength was 210 nm,column temperature was 20℃.Characteristic peaks of the fingerprint could be rapidly analyzed by high performance liquid chromatography-mass spectrometry (HPLC-MS),and the software of similarity analysis was used to calculate the similarity of all the Dried Scallop samples.Results All samples tested contained the same nine peaks,and the similarities of 10 batches of Dried Scallop were more than 0.85.MS and UV spectra of the 4 characteristic peaks obtained using HPLC-MS could be used to accurately confirm the characteristic and common peaks in fingerprint of Dried Scallop.Conclusion This method is simple,accurate and stable,and can provide scientific reference for the identification and quality control of Dried Scallop.国家自然科学基金(No.20602009;20905017);海洋公益性行业科研专项(No.200705011;200805039

    Simultaneous determination of 7 nucleosides in Asterias rollestoni using reversed-phase high performance liquid chromatography

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    建立了罗氏海盘车中7种核苷化合物的反相高效液相色谱分析测定方法。采用超声波辅助提取,选用两根不同的C18色谱柱串联,以甲醇和0.2%(体积分数)乙酸/水溶液为流动相梯度洗脱分离。优化的色谱条件为:柱温为室温,检测波长为260nM,流速为0.8Ml/MIn,进样量为20μl。结果表明,7种核苷化合物在一定的浓度范围内线性关系良好,次黄嘌呤和胸苷的线性范围为0.65~40Mg/l,尿苷、黄嘌呤和肌苷的线性范围为0.80~40Mg/l,胸腺嘧啶的线性范围为1.15~40Mg/l,鸟苷的线性范围为0.50~40Mg/l。样品中7种核苷化合物的加标回收率为90.00%~105.00%,相对标准偏差为0.72%~3.23%。该方法操作简便、灵敏度高、重复性好,回收率高,适用于罗氏海盘车中7种核苷类成分的同时分析,也可用于罗氏海盘车的质量控制和综合评价。A method for the simultaneous determination of 7 nucleosides in Asterias rollestoni was devel-oped using reversed-phase high performance liquid chromatography ( RP-HPLC) .Analytes were extracted by ultrasonic-assisted extraction and separated on two different C18 columns,which were connected in se-ries,under the gradient elution with the mobile phases of methanol and 0.2% ( v/v) acetic acid/water at room temperature.The chromatographic conditions were as follows: flow rate,0.8 mL/min; detection wavelength,260 nm; injection volume,20 μL.Under the optimized conditions,good linear relationships between the values of mass concentrations and the peak areas of hypoxanthine,uridine,xanthine,thy-mine,inosine,guanosine and thymidine were observed in the ranges of 0.65-40,0.80-40,0.80-40,1.15-40,0.80-40,0.50-40,and 0.65-40 mg/L,respectively.The relative standard devia-tions were around 0.72%-3.23% and the recoveries were around 90.00%-105.00%.The results showed that the developed method is sensitive,accurate and reproducible.It is suitable for the analysis of nucleosides in Asterias rollestoni with high recoveries and it is expected to be used for the quality control and evaluation of Asterias rollestoni.国家自然科学基金项目(20905017);海洋公益性行业科研专项(200705011;200805039);海洋局青年基金项目(2010140);海洋一所基本科研业务专项(GY-022008T32;2010G25);中国科学院实验海洋生物学重点实验室开放基金课

    Underwater acoustic communication based on HFM rate keying

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    为了解决双曲调频二进制正交键控调制体系速率过低的问题,在传统二进制双曲调频率键控的基础上,提出了基于频带划分的制式级联啁啾率键控调制方法。这种调制方法用多进制频率键控来选通频段,在每个子频段内采用啁啾率键控解调模块,在解调端用快速傅里叶变换(ffT)和匹配滤波器代替分数阶傅里叶变换实现解调,从而大大减少了系统计算量。通过仿真及水池实验,验证了所提出的通信方法在水声通信中的抗噪性能与抗多径性能。实验结果表明,误码率控制在10-3数量级以下,具有一定的实用性。To solve the problem that the rate of HFM BOK modulation system is too slow,on the basis of the traditional binary hyperbolic frequency modulated(HFM)rate keying,this paper proposed standard cascade HFM rate keying modulation method based on frequency bands allocation.This modulation method uses multiple frequency shift keying to choose frequency band,adopts HFM rate keying demodulation module in every sub-band,and utilizes FFT and matched filter instead of FRFT to realize demodulation,so that it can decreases the calculation of the system largely.Through simulation and pool experiment,the proposed communication method has anti-noise and anti-multipath performance in underwater acoustic communication.Experimental results show that the bit error rate can be controlled below with a certain practicality.国家自然科学基金资助项目(61001142;61471308); 中央高校基础研究基金资助项目(2011121050
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