硼酸盐矿物的振动光谱研究：Ⅰ：喇曼光谱特征     

谢先德  查福标 《矿物学报》1993,13(2):130-136

本文利用激光喇曼光谱研究了不同类型的硼酸盐矿物,讨论了它们的谱带特征及其归属。研究结果表明,具简单基团的喇曼光谱可以作出比较明确的归属,且与红外光谱结果一致,而同时具三、四配位硼的矿物,其配阴离子虽很复杂,各种谱带相互叠加,但仍可以对主要谱带作出初步的归属。  相似文献   

黑龙江省气候变暖对极端天气气候事件的影响   总被引：38，自引：2，他引：38  

周秀杰  张桂华  郑红  潘华盛 《气象》2004,30(11):47-50

黑龙江省1980年以来气候变暖已成为事实，气候变暖导致天气气候极端事件的发生，主要表现在：①大雨暴雨次数增加；②30℃以上极端最高气温平均日数下降；③-30℃以下极端最低气温平均日数明显减少；④初霜日平均后延2～5天；⑤终霜日，北部中部提前3～5天而南部延长；⑥夏季低温次数明显减少，北部减少多于南部；⑦大旱年次数增多，大涝次数北少南多，西南部地区为旱涝敏感区。  相似文献   

NetCDF数据的编程式访问   总被引：3，自引：0，他引：3  

查石祥 《气象科技》2004,32(Z1):40-43

NetCDF是一种面向数组型数据的描述和编码标准,目前广泛应用于大气科学、水文、海洋学、环境模拟、地球物理等诸多领域.用户可以借助多种方式方便地管理和操作NetCDF数据集.文章介绍NetCDF数据的编程式访问方法.该方法主要应用于数值预报模式,它涉及软件创建、参数配置、NetCDF文件结构、NetCDF接口函数库等.重点探讨了编程者在使用该方法时经常遇到的一些问题,并且给出了一个读取NCEP再分析文件的编程实例.  相似文献   

基于反对称小波的车型识别研究     

袁志勇  查桂峰  陈绵云  张仁宏 《武汉大学学报(信息科学版)》2005,30(6):560-563

在对车型识别去噪和边缘检测进行分析的基础上，提出了一种基于反对称小波的检测方法。首先采用尺度间相关性和尺度内相位法进行有效去噪，然后检测变换模极大值，并进行有效区分保留真正边缘模极大值，最后进行相关恢复处理得到比较清晰的车型边缘。结果表明，该方法提高了车型边缘检测的准确性和车型识别率，具有很好的应用前景。  相似文献   

Bioenergetic responses in green lipped mussels (Perna viridis) as indicators of pollution stress in Xiamen coastal waters, China     

Shuhong Wang  Huasheng Hong  Xinhong Wang 《Marine pollution bulletin》2005,51(8-12):738

Samples of green lipped mussels (Perna viridis) were collected from three sites (Huoshao, I’Maluan and Tong’an) around Xiamen coastal waters, where levels of various trace organic pollutants have been studied. Samples were also collected at a “cleaner” reference site near Dongshan Island for comparison. Clearance rate, absorption efficiency and oxygen consumption of the mussels were measured under controlled laboratory condition; organic pollutants in their tissues were also analyzed. Scope for growth (SFG) was employed as a general biomarker to evaluate the stress of pollutants. Specimens from Tong’an site had the lowest SFG values (1.14 J/h/g); while specimens from the I’Maluan site and Huoshao site had SFG values of 5.01 and 6.72 J/h/g, respectively. Specimens from Dongshan (reference site) had a relatively high SFG value of 10.96 J/h/g. There was a significant negative correlation between the SFG of the different populations of green lipped mussels and the concentration of DDT in their tissues.  相似文献   

Upper mantle convection driving by density anomaly and a test model     

傅容珊  王景赟  常筱华  黄建华  戴志阳  查显杰 《地震学报(英文版)》2005,18(1):27-33

Introduction Richter and Mckenzie (1978) supposed that there is a small-scale convection system in the mantle. For a long time lots of research provides observational data to infer the possibility of a small-scale convection in the upper mantle. For example, Haxby and Weissel (1986) discussed the relationship between SEASAT map and small-scale convection. Baudry and Kroenke (1991), Maia and Diament (1991) found that the geoid and bathymetry exhibit peaks in the 400~650 km range in the Pa…  相似文献   

Determination and load of organophosphorus and organochlorine pesticides at water from Jiulong River Estuary,China   总被引：15，自引：0，他引：15  

Zulin Z  Huasheng H  Xinhong W  Jianqing L  Weiqi C  Li X 《Marine pollution bulletin》2002,45(1-12):397-402

Seventeen organic phosphorus pesticides (OPs) and 18 organic chlorine pesticides (OCs) at water from Jiulong River Estuary (JLRE) are determined by SPE–GC–(FPD and μECD). The contents of the total OPs (17) ranged from 134.8 to 354.6 ng/l (the mean is 227.2 ng/l). Total OCs concentrations varied from 115.4 to 414.7 ng/l in water (mean 237.7 ng/l). The levels of total hexachlorocyclohexane in water varied from 31.95 to 129.8 ng/l (mean 62.51 ng/l), and those of total DDTs were in the range 19.24–96.64 ng/l (mean 48.69 ng/l). The distribution and behavior characteristics of OPs indicate that five main OPs (methamidophos, dichlorvos, malathion, omethoate and dimethoate) occupied the most part of the total OPs, in addition, the sources of the OPs (mainly from current usage) are not stable. While the OCs mainly came from early application and were more stable. The OPs did not have obvious correlation with the dissoved organic carbon and suspended particulate matter at water from JLRE. It maybe due to the complicated hydrological kinetics in the estuary, and the higher water solubility and weak absorption (with organic matter) action of OPs. When compared with other areas, the OPs and OCs level in JLRE are some moderate.  相似文献   

昆明近300年的旱涝变化规律   总被引：3，自引：0，他引：3  

严华生  谢应齐  赵筱青  曹杰  周传喜  罗兰仙 《热带气象学报》1998,14(2):119-125

应用昆明近３００年历史旱涝指数和近百年降雨观测资料,研究了旱涝历史气候演变、气候周期变化和年际变化的规律,探讨了厄尔尼诺、太阳黑子、大气环流因子对旱涝气候变化的影响。主要结果有：（１）昆明旱涝气候变化主要存在４０年和１１年的周期,４０年变化周期受厄尔尼诺变化周期影响,１１年变化周期受太阳黑子变化周期影响,厄尔尼诺和太阳黑子的周期变化是昆明旱涝周期变化和两大影响因子。（２）昆明降雨年际变化与大气环流  相似文献   

我国地面太阳辐射量的时空变化研究   总被引：30，自引：1，他引：30  

查良松 《地理科学》1996,16(3):232-237

在分析我国到达地面太阳辐射量（１９５７￣１９９２年）时空变化分布规律基础上，阐述了火山爆发产生的气溶胶和城市发展带来的人工气溶胶对太阳辐射量变化的影响，以及大气中气溶胶增加和地面太阳总辐射量的减少在环境研究中的问题。  相似文献   

苏联粮食产量预报方法的初步研究   总被引：1，自引：0，他引：1  

蓝鸿第  潘华盛 《大气科学》1987,11(3):282-288

苏联粮食产量有准2年和4年振荡周期,它与准2年赤道平流层位相风有较好的对应关系,吹西风往往歉收;吹东风则经常丰收.并与南方涛动有4年左右同相振荡关系,涛动由高指数变化为低指数时,粮食大多为歉收;反之多为丰收.4—6月份500hPa环流形势,西欧有阻高建立且稳定,并在欧洲盛行“N”型环流形势时,则有利于粮食丰收;反之则歉收.  相似文献