衰落原因,causes of decline
1)causes of decline衰落原因
英文短句/例句
1.Some Thoughts on the Decline of Democratic Political Affairs in Athens关于雅典民主政治衰落原因之我见
2.Reason for Cross-stitch Fashion and Recession of Traditional Handmade Embroidery;十字绣流行与传统手绣衰落原因研究
3.On the Causes of the Contemporary Decline of China s Traditional Sciences;中国传统科学文化近代衰落原因刍议
4.How Learners from Home and Abroad Understand the Cause for the Comedown of British Economy;中外学者对英国经济衰落原因的认识
5.Exploration and Analysis of the Decline Causes of "Chivalry" in the Late Middle Ages中世纪晚期“骑士精神”衰落原因探析
6.The Conservative Factor of the Decline of Industry and Commerce in Italy during 16th and 17th Centuries;16-17世纪意大利工商业衰落原因中的保守因素
7.The New Explains on the Quick Decline of the Privately Owned Industrial and Commercial Enterprises in Emperor Wudi Period of Han Dynasty;西汉武帝后私营工商业迅速衰落原因新解
8.On the Basic Characters and the Reasons of the Decline about the Shuchang Tanci of the Qing Dynasty;清代书场弹词之基本特征及其衰落原因
9.The Analysis on Reasons for Development and Decline of Yantai Trade in Late Qing Dynasty (1863-1911)晚清烟台贸易的发展及其衰落原因分析（1863-19）
10.Analysis of Cause of Declining of the Filial Piety in the Modern Age;中国传统孝德在近代衰落的原因探析
11.Study on the Causes of the Rise and Fall of ForestryAdministration in Early Republic of China;民国初年林政兴起和衰落的原因探析
12.Analysis of the reasons for economic decline in country town and tackling ideas;县域经济衰落的原因分析与治理思路
13.Reason of the Decline of Ancient Chinese Mathematics and Some Enlightenment;试论中国古代数学衰落的原因及启示
14.The Decline of the Study of The Analects of Confucius in the Sui-Tang Period试论隋唐时期《论语》学衰落的原因
15.Salt Traders of Changlu in the Period of Qianlong浅析乾隆时期长芦盐商走向衰落的原因
16.The fall of Rome may have partially resulted from exhaustion of cropland.古罗马衰落的部分原因可能是农田的地力耗
17.The Decline of Florence s Textile Industry in Renaissance;试探文艺复兴时期佛罗伦萨毛织业衰落的原因
18.The Characteristics and the Reasons for the Generation and Decline of the Three-syllable Adverbs in the Buddhist Literature;佛教文献三音节副词特点及产生、衰落的原因
相关短句/例句
The reason for one"s ruin;downfall.衰败的原因;衰落
3)The reason of Four-Words-Poem s comedown四言诗衰落的原因
4)A new probe into the factors in Huizhou merchants" decline徽商衰落原因新探
5)decline factor衰落因子
1.then selects the microwave antenna according to several factors:the first Fresnel zone,thedecline factor and the relative bandgap,analyses and studies them in detail,and puts forward several issues when selecting microwave antenna should pay attention to.简述微波天线在通信中应用的广泛性和重要性,在对第一菲涅尔区、衰落因子和相对余隙等重要因素详细分析的基础上,提出选择微波天线时应注意的问题,并提出采用分集接收、自适应均衡、阻抗匹配和避雷保护等技术改善微波天线的性能,进而提出微波天线选择的优化方案。
6)the reason of causing decreasing致衰原因
延伸阅读
衰落衰落fading接收信号电平的随机起伏，即接收信号幅度随时间的不规则变化。衰落对传输信号的质量和传输可靠度都有很大的影响，严重的衰落甚至会使传播中断。衰落主要由多径干涉和非正常衰减引起。①多径干涉。即多条射线的相互干涉，是最常见的也是最重要的衰落成因。多条射线的产生，可能是由于地面、大气不均匀层或天线附近的地形地物的反射，也可能是由于电离层多次反射、电离层中的寻常波和非常波或天波和地波的同时出现。多径干涉形成的衰落通常称为多径衰落或干涉型衰落。②非正常衰减。典型的例子有降水衰减和次折射引起的绕射衰减；后者是由于发射点和接收点之间的直射线弯曲而被地面阻挡所形成的。衰减发生时，接收信号电平低于正常值，从而形成衰落，称为衰减型衰落。其中，降水和次折射条件下的绕射所形成的衰落，分别称为降水衰落和绕射衰落。衰落通常分为快衰落和慢衰落两种。前者是指在足够短的时间间隔（如几秒、几分）内接收信号电平的快速变化。多径传输是引起快速衰落的主要原因。慢衰落是短期信号电平中值（如几分钟中值，日、月、年中值等）在较长时间间隔内的变化。传输媒质结构的变化是引起慢衰落的主要原因。由于衰落具有随机特性，需用统计方法如概率密度或分布函数描述。快衰落的幅度分布一般服从瑞利分布。在对流层散射传播中，慢衰落通常服从对数正态分布。
