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21.
重庆大气微生物污染动态变化规律 总被引:8,自引:0,他引:8
本文报道了重庆7个测点的大气微生物的含量及日动态变化规律。结果表明一般每日出现污染高峰期是11:00和19:00,污染低峰期为2:00和23:00。 相似文献
22.
大气中真菌粒子的衰亡和净化,除与真菌自身的因素有关外,与日光辐射也有密切关系。此文现场观测了日光辐射对大气真菌粒子的影响。结果表明,一天内大气真菌粒子浓度与日光辐射强度呈反比:大气真菌粒数直径中值与日光辐射强度呈正比:随着日光辐射强度的增大,<3.0μm的大气真菌粒子,其浓度减小的速度比>3.0μm的快。 相似文献
23.
文章按照《制定地方大气污染物排放标准的技术方法》建立了蚕桑区大气氟化物允许排放速率牟模型,根据蚕桑区氟污染特征,污染危害特征和污染气象特征确定模型参数,提出了浙江省杭嘉湖蚕桑区大气氟化物排放标准,并分析了标准的经济和技术可行性。 相似文献
24.
The aim of this research work is to investigate the temporal and regional behaviour of the PAH in the Thessaloniki's area. During a period of six months, airborne particulate matter was collected twice a week and PAH were determined by HPLC. Profiles as well as concentrations of selected cancerogenic PAH differ in some cases from area to area and have characteristic, temporal changes of concentration. 相似文献
25.
Smodis B 《Journal of environmental management》2007,85(1):121-128
In the framework of the IAEA programmes, Member States involved in air pollution studies using nuclear analytical techniques have harmonized their methodologies. Participants characterising chemical composition of size fractionated airborne particulate matter based their methodology on a common type of air sampler, centralised data collection and evaluation, and the same kind of data processing. Institutions involved in biomonitoring air pollution identified appropriate organisms to be applied at a regional scale, and harmonized procedures for sample preparation and analysis, as well as data processing and presentation. Both metrology approaches have been validated and disseminated in many Member States. 相似文献
26.
27.
Kim KY Ko HJ Kim HT Kim YS Roh YM Lee CM Kim CN 《Environmental monitoring and assessment》2007,133(1-3):255-266
This on-site survey study was performed to determine the concentrations and emissions of aerial contaminants in the different
types of swine houses in Korea and then to present beneficial information available for Korean pig producers to manage optimal
air quality in swine house. The swine houses investigated in this research were selected based on three criteria; manure removal
system, ventilation mode and growth stage of swine. Mean concentrations of aerial pollutants in swine houses were 8 ppm for
ammonia, 300 ppb for hydrogen sulfide, 2 mg m−3 for total dust, 0.6 mg m−3 for respirable dust, 4 log(cfu m−3) for total airborne bacteria and 3 log(cfu m−3) for total airborne fungi, respectively. Mean emissions based on pig (liveweight; 75 kg) and area (m2) were 250 and 340 mg h−1 for ammonia, 40 and 50 mg h−1 for hydrogen sulfide, 40 and 50 mg h−1 for total dust, 10 and 15 mg h−1 for respirable dust, 1.0 and 1.3 log(cfu) h−1 for total airborne bacteria and 0.7 and 1.0 log(cfu) h−1 for total airborne fungi, respectively. In general concentrations and emissions of gases were relatively higher in the swine
houses managed with deep-pit manure system with slats and mechanical ventilation mode than the different swine housing types
whereas those of particulates and bioaerosol were highest in the naturally ventilated swine houses with deep-litter bed system. 相似文献
28.
Vanderstraeten P Lénelle Y Meurrens A Carati D Brenig L Offer ZY 《Environmental monitoring and assessment》2007,132(1-3):253-262
We report and analyze data on the PM10 fraction of airborne particles measured at five recording stations in the Brussels
region from October 2002 till September 2003. These stations are representative of the various activity sectors of the Brussels
urban area. The objective was the determination of the origin of the PM10 particles (particles up to 10 μm) that are recorded
in that region in order to follow the EU directives concerning tolerance level of airborne particles concentration. In order
to evaluate the impacts of local and external factors that inject solid particles in the atmosphere of Brussels we compared
concentration data from working and not working (holidays) periods. Moreover, we also compared concentrations from periods
of agricultural activity and rest in the Brabant provinces surrounding the Brussels region for various crop types. The results
lead to the conclusion that the impact or urban traffic is rather limited while that of the agricultural activities is important.
Moreover, there appears a clear-cut distinction between different types of crops. 相似文献
29.
30.
The Geological Survey of Sweden (SGU) has been conducting airborne gamma spectrometry measurements of natural radioactivity in Sweden for more than 40 years. Today, the database covers about 80% of the country’s land surface. This article explores the first step of putting this data into use in radioactive source search at ground level. However, in order to be able to use the airborne background measurements at ground level, SGU data must be validated against terrestrial data. In this work, we compare the SGU data with data measured by a portable backpack system. This is done for three different areas in southern Sweden. The statistical analysis shows that a linear relationship and a positive correlation exist between the air and ground data. However, this linear relationship could be revealed only when the region possessed large enough variations in areal activity. Furthermore, the activity distributions measured show good agreement to those of SGU. We conclude that the SGU database could be used for terrestrial background assessment, given that a linear transfer function is established. 相似文献