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信号的双谱能反映信号的细微特征,可用于电台识别中,但将它直接应用于电台识别需要计算复杂的匹配模板,增加分类器的复杂度,影响识别效率。针对此问题,提出了一种将信号围线积分双谱的分形特征作为电台特征参数的识别方法。首先由信号双谱估计值求出围线积分双谱,然后利用盒维数和信息维数定量描述围线积分双谱波形的复杂度,并将这两种分形维数作为特征向量,最后利用支持向量机(SVM)实现电台分类识别。对两部实际电台所发射的2FSK信号利用所提方法进行分析,结果表明在信噪比为7 dB及以上时,电台正确识别率能达到94.29%以上,验证了所提方法的可行性。 相似文献
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时间:2008年5月12日14时28分04.0秒;纬度:31.0°N;经度:103.4°E;深度:14km;震级:里氏震级8.0级,矩震级7.9级;最大烈度:11度;震中位置:四川省汶川县映秀镇。都江堰市西21km(267°)崇州市西北48km(327°)大邑县西北48km(346°)成都西北75km(302°)汶川地震是中华人民共和国自建国以来影响最大的一次地震,震级是自2001年昆仑山大地震(8.3级)后的第二大地震,直接严重受灾地区达10万平方公里。 相似文献
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针对有源幅相误差校正方法需要已知校正源位置,以及迭代自校正方法依赖初值选取等问题,提出了一种信号源位置未知条件下机载天线阵列幅相误差的自校正方法。所提方法利用机载阵列随机载平台运动过程中的多次观测数据,通过挖掘多组观测数据的特征空间结构,将外辐射源位置和阵列的幅相响应进行分步估计。所提算法在幅相响应的估计过程中,也完成了对辐射源的定位。同时,所提方法对机载平台运动轨迹、阵列具体几何形式均未做特定限制。仿真实验结果表明,当信噪比大于5 dB时,所提算法对阵列幅度误差的估计误差小于0.5 dB,对阵列相位误差的估计误差小于2°,验证了所提算法的有效性。 相似文献
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《电脑采购》2006,(21):16-16
TOP1频率三频/支持GPRS尺寸(m m)101×46×15.9重量99克主屏参数26万色分辨率176×220摄像头130万像素C M O S红外/蓝牙支持蓝牙推荐指数80三星SGH-D5283180元频率三频/GPRS尺寸(mm)96×50×17重量99克主屏参数26万色,分辨率176×220摄像头200万像素红外/蓝牙支持蓝牙LGG9122780元时尚美观频率双频/GPRS尺寸(mm)94×42×24重量87克主屏参数65K色,分辨率128×160摄像头30万像素红外/蓝牙支持红外联想E3281299元国货新品频率三频/GPRS尺寸(mm)90×47×24重量93克主屏参数65K色,分辨率176×220摄像头30万像素红外/蓝牙均支持索爱… 相似文献
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目的:分析比较高必需氨基酸米Y-800与11种食物的氨基酸组成,对其做出营养评价,为进一步研究开发高必需氨基酸米Y-800提供依据。方法:根据FAO/WHO的理想蛋白质条件,计算组成蛋白质的每种必需氨基酸/总氨基酸的值(E/T)和必需氨基酸/非必需氨基酸的值(E/N),对高必需氨基酸米Y-800及11种食物做出初步营养评价;蛋白质的营养评价指标包括氨基酸评分(AAS)、化学评分(CS)、必需氨基酸指数(EAAI)、氨基酸比值系数(RC)、氨基酸比值系数分(SRC),氨基酸呈味贡献指标选择味觉阈值比(RCT)。结果:高必需氨基酸米Y-800氨基酸种类齐全,数量丰富,E/T值为40.33%,E/N值为0.68;与所选11种食物比较AAS、CS和EAAI,高必需氨基酸米Y-800限制性氨基酸种类少,各种必需氨基酸评分较高;鲜味氨基酸为高必需氨基酸米Y-800的主要呈味氨基酸,RCT值为小麦粉高必需氨基酸米Y-800小米早籼晚籼玉米粳米。结论:高必需氨基酸米Y-800必需氨基酸含量达到了FAO/WHO提出的理想蛋白质条件且风味佳,较所选11种食物更符合人体需求,更益于人体健康。 相似文献
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李先勇 《中国商贸:销售与市场营销培训》2010,(14)
目前,"361°"这个对于我国大多数体育爱好者都再熟悉不过的品牌已经凭借自身的市场运营和推广深入人心。良好的市场口碑和信誉度使得越来越多的人们开始关注"361°",开始喜欢"361°",而其年轻时尚的市场定位也为自己赢得了众多的客户群,尤其是学生的喜欢。本文以陕西省为调查研究区域,就"361°"品牌的市场推广与运营做出相关性阐述和分析,旨在为我国体育品牌的发展提供可行性参考依据。 相似文献
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《电脑采购》2006,(26):17-17
三星SGH-D728频率三频/GPRS尺寸(mm)103.8x50x19.8重量115克主屏参数26万色,分辨率176x208摄像头200万像素红外/蓝牙支持蓝牙诺基亚32503050元年度新品频率四频/GPRS尺寸(mm)99.9×48×24重量116克主屏参数65K色,分辨率176×220摄像头120万像素红外/蓝牙支持蓝牙摩托罗拉MPx2201650元性价比高TOP1频率三频/支持G P R S尺寸(m m)108.8×53×17.5重量126克主屏参数26万色分辨率176×208摄像头200万像素C M O S红外/蓝牙支持蓝牙推荐指数90诺基亚N703350元多普达586华硕MyPalA632处理器IntelXscale(416MHz)R A M容量64M B操作… 相似文献
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《中国对外贸易(英文版)》2008,(5):50-51
The overall strategic relationship between U.K. and China is "better than ever", China- Britain relations have maintained good momentum, with increased high-level exchanges and the reinforcement of strategic mutual trust, with more room for growth in the future. 相似文献
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Guo Yan 《中国对外贸易(英文版)》2008,(5)
Domino effects of the global finance agitation As the origin of the subprime crisis,US financial institutions lost USS45 billion last year,accounted for over half of the total US,EU & Japan loss.Since January 15th,Chtigroup released its financial statement of the 4th quarter,showing a net deficit of USS9.83 billion,which marked the hisoric high of its quarterly deficit. 相似文献
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《中国对外贸易(英文版)》2008,(6):62-65
Among the Fortune 500 firms,more and more images from China emerge out.On the 2008 list,Sinosteel Corporation,a landmark group of China industries quietly squeezes into the candidate line.As the largest steel service & trade enterprise,its sales reached at RMB 111.24 billion,with a year-on-year increase of 83.03 percent,and the profit grew by 180.03 percent.On the Sinosteel 2008 Work Meeting,the president Huang Tianwen uttered,"In the coming year,we will work for US$20 billion sales,and look forward to getting a position in Fortune 500 firms for ourselves." 相似文献
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Zang Kejia 《中国对外贸易(英文版)》2008,(7):16-17
When the 103rd Canton Fair is approaching, an old friend of Canton Fair, Li Ying from Jiangsu prov-ince recollected his past five years' experiences to the grand trade meeting. Each year is special, with some unforgettable memories colored by the year. 相似文献
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Estaing, former French president, Valery Giscard d'Estaing attended Sino-French Economic Seminar held in Shanghai in early April and said that the world center has shifted from the west to the east with many European and US companies entering into Asia, and China has the ability to play an important role in the world stage. Estaing, naming himself"French Confucian", then said in Chinese that a cook-group includes 10 people in ancient Chinese soldier system and the cook is in charge of cooking for them. And people who belong to the same cook are actually "Partners". 相似文献
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《中国对外贸易(英文版)》2008,(5):12
The annual meeting of the World Economy Forum was held in Davos,a little town in Switzerland,on January 23rd to the 27th this year,with the theme"the Power fo Collaborative Innovation",over 2500 celebrates from ture political and cconomic circles of more than 80 countries and challengred logether to talk about the future of the global economy in 2008,A Forum for the problems and challenges that face whole world,some of the keywords which drew attention during the event were:the U.S.subprime mortgage crisis,soaring energy prices,the economic slowdown in the U.S.ermerging economic bodies,authority funds and the general unpredictable nature of the global economy. 相似文献
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"If you are considering to trade with companies in Japan or expanding your business to Japan we are ready to help from the very beginning."You will find this greeting at the first sight on the Chinese website of Japan External Trade Organization 《中国对外贸易(英文版)》2008,(10):16-17
If you are considering to trade with companies in Japan or expanding your .business to Japan, we are ready to help from the very beginning." You will find this greeting at the first sight on the Chinese website of Japan External Trade Organization (JETRO). JETRO has committed itself in delivering highly efficient and quality services to meet the demand of internal and external customs including Japanese companies, hence winning a good reputation in the international trade arena. In recent years, with its priority in advancing business cooperation in South and East Asia, JETRO has made great achievement in promoting trade between China and Japan. Therefore, China's Foreign Trade interviewed Mr. Yoichi Maine, Deputy Director General of JETRO BEIJING. 相似文献
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Guo Yan 《中国对外贸易(英文版)》2008,(12):62-63
Looking at the increasingly fierce competition in the world auto market. global automobile manufacturing industry, taking Europe, the U.S. and Japan as representatives, is gradually forming a new type of relationship, mutual cooperation between whole vehicle and parts manufacturers. We can clearly see that auto parts manufacturers have become independent from the whole vehicle manufacturing companies, which means that the former structure of auto industry has greatly changed, and a new relationship, 相似文献
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Guo Yan 《中国对外贸易(英文版)》2008,(1):10-10
In the middle of last December, the key purchase contracts for coal used in power generation in 2008 were signed, reflecting a demand for more than 1.085 billion tons. It is important to note that the country's five biggest power producers, China Huaneng Group, China Guodian Corporation, China Power Investment Corporation, China Huadian Corporation and China Datang Corporation, had settled on the prices on their purchase contracts, and they are expected to consume 290 million tons of coal for generating electricity, 相似文献
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Liu Xinwen 《中国对外贸易(英文版)》2008,(10):40-41
Last November the State Council of China decided to renew its holiday system by reducing the seven-day May Day holiday to three days and introducing three new one-day public holidays, namely the Qingming Festival, Dragon Boat Festival and Moon Festival. By doing so, the three golden-week holidays that were introduced in 1999, namely the Spring Festival, May Day and National Day, could be better distributed. 相似文献