1) dust storm PM_(2.5)
沙尘暴PM2.5
2) dust
沙尘
1.
The Experimental Study of Retrieving Dust Aerosol Size Distribution Using Multichannel MODIS Remote Sensing Data;
利用多通道MODIS遥感资料反演沙尘气溶胶尺度分布的个例试验
2.
A statistic regression approach was introduced to estimate the wavelength index of black carbon and dust particles,and further to separate the contribution of the two types of aerosols to the aerosol light absorption coefficients measured in the spring of 2006 in Beijing urban area.
对2006年春季北京城区大气气溶胶中沙尘和黑碳气溶胶吸收系数的波长指数及其对总吸收系数的贡献进行了估算。
3.
The results show that the dust happened rarely in the spring of 2005,and only five times were observed from January to February,three of them happened in April.
观测结果表明2005年春季沙尘发生次数较少。
3) sand dust
沙尘
1.
Study on the pollution of sand dust;
沙尘对污染的影响、成因及预报
2.
Abrasive wear experiment of PEN(polyethylene2, 6-naphthalenedicarboxylate) tape was performed in sand dust environment with ATM(Auto Teller Machine) tribosystem.
选取聚萘二甲酸乙二酯(PEN)薄带在ATM自动取款机摩擦学系统中进行了沙尘磨粒磨损试验,利用表面形貌仪以一定时间间隔测量薄带磨损形貌,采用结构函数法考察磨损形貌的分形特征,并利用扫描电子显微镜分析其磨损机理。
4) sand-dust
沙尘
1.
The sources of sand-dust during sand blowing weather mainly come from Beijing outskirts.
沙尘天气分沙尘暴、扬沙、浮尘三种,北京扬沙天气的沙尘源以就地起沙为主。
2.
In this paper,the basic laws and characteristics of the different-structured shelterbelts in reducing sand-dustin air near ground surface are researched based on summing up the predecessors’ achievements by usingcomparability theory and wind tunnel simulation.
在总结前人研究的基本理论基础上,依据相似性理论,采用风洞模拟实验的方法,研究不同结构类型防护林降解近地表沙尘的基本规律及特征。
3.
The technical route of this study is to study the characteristics of wind-blown sand movement and sand-dust control mechanism of plants with blown sand physics and mathematical statistics as basic principles, combining theories of forestry, ecology and other subjects.
本项研究的技术路线是以风沙物理学、数理统计学的基本原理，结合林学、生态学等学科理论来研究风沙运动特征及植被抑制沙尘的机理。
5) dust storm
沙尘
1.
Harbin dust storm event formation causes and the changes of urban air pollutants in dust storm event;
哈尔滨沙尘天气成因及其对城市大气污染的影响
6) sand and dust
沙尘
1.
In recent years,not only the sand and dust weather often appears,but also partial sand and dust occurs in city.
近年城市中不仅常常出现沙尘天气 ,还有局部沙尘频繁出现。
2.
Based on the data of Lanzhou meteorological observation from 1971 to 2000 and the data from 2001 to 2004,the temporal characteristics and the cause of sand and dust weather in Lanzhou city are analyzed.
利用1971~2000年和2001~2004年兰州市观测站资料,分析了兰州市沙尘天气的气候特征和2001~2004年沙尘天气特点及产生原因。
3.
Therefore, we must using effective monitoring to realize sand and dust events in order to decrease the loss.
沙尘天气是具有破坏力的灾害性天气,它给工农业生产和人类身体健康带来巨大影响,而且可能引起气候学效应,造成自然生态坏境的破坏。
参考词条
补充资料：Pm和隐藏式pm7.62mm狙击步枪
Image:11557266295155940.jpg
pm和隐藏式pm7.62mm狙击步枪
中文名称: 英国pm和隐藏式pm7.62mm狙击步枪
研制国别: 英国
研制机构: 精密仪器制造公司
分类: e922.12
关键词: 枪械 步枪 陆军装备
简介
pm7.62mm狙击步枪是英国精密仪器制造公司为执行狙击任务而研制的步枪，其设计思想是：不管枪管清洁是与否，都要做到首发命中。
pm 7．62mm狙击步枪系统主要有步兵用、警用和隐藏式3种。步兵用pm狙击步枪已装备英国陆军，被命名为l96a1式，非洲、中东和远东一些国家的陆军也装备有此枪。
警用pm狙击步枪采用单发射击方式，可发射多种口径马格努姆枪弹。1000m距离内使用0．300in温彻斯特马格努姆和7mm雷明顿马格努姆枪弹，1000m以外距离使用8．6mm枪弹。
带消声装置的pm狙击步枪也在生产，这种枪发射特种亚音速弹，在300m射程内弹道较低伸、风偏不大的情况下，命中率较高。
隐藏式pm 7.62mm狙击步枪是pm狙击步枪系统的最新型，也是带消声装置的pm狙击步枪的可拆卸型，已投入批量生产。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。