通过自由振荡了解地幔

大地震辐射的地震波穿过整个地球。因为这些波仅在地球内部传播,所以经历了多次反射,并且沿相反方向传播的波之间的相互干涉形成了一种驻波形态:地球的简正振型(图1)。这些“体”波也受到传播它的介质的影响。因此它也就带有关于地球弹性分布和间断位置的有价值信息。     

河南省层波状云系飞机人工增雨作业条件短期预测方法

对河南省春秋季降水以及云状特征的分析表明,河南省春秋季降水大多为层状云或波状云产生的稳定性降水,因而可采用对河南省分区分级进行降水预测的方法来确定适合飞机人工增雨的天气过程以及短期增雨区域。利用T213数值预报产品,运用逐步回归建立分区分级预报方程,并针对个别准确率较低的区域进行后处理。结果表明,用此方法对人工增雨作业进行指导是可行的。     

利用双频微波辐射计测空中水汽和云液水含量的个例分析

利用23.8GHz和31.65GHz双频地基微波辐射计观测资料,结合卫星云图、雷达、探空和自记雨量计等资料分析了2005年4月在河南新乡观测的不同云系影响时大气垂直积分含水量(V)和云中液态含水量(L)的演变特征,对4月8日低槽云系影响时V、L的特征进行了分析。结果表明:双频辐射计对空中水汽和液态水反映灵敏,不同天气背景时对应有不同的V、L值分布。云液水含量L的变化与云量的增减有关。降水开始之前,水汽含量V值有明显波动,液态水含量L值也有明显增加,一般增大到0.4mm时即出现降水。这些现象对降水开始有指示意义,可预测云系正处于降水产生的阶段,可应用于人工增雨作业。此外,根据微波辐射计观测资料分析了大气水汽、云液水和地面降水之间的定量关系,云中液态水仅占汽态水的8.7‰左右,落回地面的降水占空中水汽量的18%左右。     

以人工增雨为契机促进气象事业发展

以人工增雨为契机促进气象事业发展刘金华靳其龙（周口地区气象局·４６６００２）周口地区人工影响天气工作大致经历了三个阶段：第一阶段，１９９０年由于没有经验在商水县试点失败；第二阶段，１９９４～１９９５年行署购买１０门高炮，先后在项城、太康、鹿邑３县试点...     

Effects of sonication and advanced chemical oxidants on the unicellular green alga Dunaliella tertiolecta and cysts, larvae and adults of the brine shrimp Artemia salina: a prospective treatment to eradicate invasive organisms from ballast water

Uptake and release of ship-borne ballast water is a major factor contributing to introductions of aquatic phytoplankton and invasive macroinvertebrates. Some invasive unicellular algae can cause harmful algal blooms and produce toxins that build up in food chains. Moreover, to date, few studies have compared the efficacy of ballast water treatments against different life history phases of aquatic macroinvertebrates. In the present study, the unicellular green alga Dunaliella tertiolecta, and three discrete life history phases of the brine shrimp Artemia salina, were independently used as model organisms to study the efficacy of sonication as well as the advanced oxidants, hydrogen peroxide and ozone, as potential ballast water treatments. Algal cells and brine shrimp cysts, nauplii, and adults were subjected to individual and combined treatments of sonication and advanced oxidants. Combined rather than individual treatments consistently yielded the highest levels of mortality in algal cells (100% over a 2 min exposure) and in brine shrimp (100% and 95% for larvae and adults, respectively, over a 2 min exposure). In contrast, mortality levels in brine shrimp cysts (66% over 2 min; increased to 92% over a 20 min exposure) were moderately high but consistently lower than that detected for larval or adult shrimp. Our results indicate that a combination of sonication and advanced chemical oxidants may be a promising method to eradicate aquatic unicellular algae and macroinvertebrates in ballast water.     

Forest carbon stocks and fluxes in physiographic zones of India

Background  

Reducing carbon Emissions from Deforestation and Degradation (REDD+) is of central importance to combat climate change. Foremost among the challenges is quantifying nation's carbon emissions from deforestation and degradation, which requires information on forest carbon storage. Here we estimated carbon storage in India's forest biomass for the years 2003, 2005 and 2007 and the net flux caused by deforestation and degradation, between two assessment periods i.e., Assessment Period first (ASP I), 2003-2005 and Assessment Period second (ASP II), 2005-2007.     

平邑县国土资源局三项举措规范地图市场管理

近日,平邑县国土资源局组织县国家安全局、经信局、工商局、文化市场管理执法局、保密局等单位组成联合检查组集中对全县地图市场、互联网地图以及测绘成果使用单位保密工作等情况进行检查。三项强化措施有力地促进了该县地理信息市场进一步规范。     

临朐县国土资源局“五招”破解用地难题

临朐县积极推进土地的集约节约利用,最大限度地挖掘用地潜能,拓宽用地渠道,有效解决了用地难、建设用地不够用的难题。一是以规划带动土地利用。该县严格按照土地利用总体规划,切实保障重点项目和有效益项目的用地。对重点项目和有效益项目的用地,