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排序方式: 共有308条查询结果,搜索用时 15 毫秒
181.
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本文针对日本遗弃在华化学武器的性质和特点,根据销毁工程对个人防护装备的需求.通过对目前国内外主要透气防毒材料的比较分析,提出了专用透气防毒服内外层纺织材料的技术性能指标和要求.为专用透气防毒服的研制做了前期技术准备。 相似文献
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184.
河北省高校社会体育专业培养目标及学生满意度调查分析 总被引:1,自引:0,他引:1
运用文献资料法、问卷调查法、数理统计法和对比分析法,对我省社会体育专业本专科院校的培养目标情况、学生收获和满意度情况进行调查分析。研究结果表明,中环院社会体育专业学生对课程体系设置的满意度最高,就业信心指数最大。进一步分析可知,以社会体育产业为目标定位、以能力本位为教育模式对社会体育专业学生的培养具有一定的优越性 相似文献
185.
Chaocan Li Shouliang Huo Zhiqiang Yu Beidou Xi Xiangying Zeng Fengchang Wu 《Environmental science and pollution research international》2014,21(20):12028-12039
Twenty-nine sediment samples were collected from Lake Chaohu, a shallow eutrophic lake in Eastern China, and were analyzed for 15 priority polycyclic aromatic hydrocarbons (PAHs) to determine the spatial distribution and exposure risks of PAHs. Three receptor models, the principal component analysis-multiple linear regression (PCA-MLR) model, the positive matrix factorization (PMF) model, and the Unmix model, were used in combination with the PAHs diagnostic ratios to investigate the potential source apportionment of PAHs. A clear gradient in the spatial distribution and the potential toxicity of PAHs was observed from west to east in the sediments of Lake Chaohu. ∑15PAH concentrations and the TEQ were in the range of 80.82-30 365.01 ng g?1 d.w. and 40.77-614.03, respectively. The highest values of the aforementioned variables were attributed to urban–industrial pollution sources in the west lake region, and the levels decreased away from the river inlets. The three different models yielded excellent correlation coefficients between the predicted and measured levels of the 15 PAH compounds. Similarly, source apportionment results were derived from the three receptor models and the PAH diagnostic ratios, suggesting that the highest contribution to the PAHs was from coal combustion and wood combustion, followed by vehicular emissions. The PMF model yielded the following contributions to the PAHs from gasoline combustion, diesel combustion, unburned petroleum emissions, and wood combustion: 34.49, 24.61, 16.11, 13.01, and 11.78 %, respectively. The PMF model produced more detailed source apportionment results for the PAHs than the PCA-MLR and Unmix models. 相似文献
186.
Environmental Geochemistry and Health - 相似文献
187.
Dong Aiguo Huo Junfeng Yan Juanjuan Dong Ailing 《Environmental science and pollution research international》2021,28(6):6405-6410
Environmental Science and Pollution Research - The research was designed to examine oxidative stress of the liver of turtle Mauremys reevesii caused by cadmium (Cd). Turtles were injected... 相似文献
188.
Shouliang Huo Chunzi M Beidou Xi Jing Su Fengyu Zan Danfeng Ji Zhuoshi He 《环境科学学报(英文版)》2013,25(10):2014-2022
The trophic status assessment of lakes in different lake regions may provide important and fundamental information for lake trophic state classification and eutrophication control. In this study, a region-specific lake eutrophication assessment standard was established through a frequency distribution method based on chlorophyll-a concentration. The assessment standards under the oligotrophic state for lakes in the Eastern plain, Yungui Plateau, Northeast Plain and Mountain Mongolia-Xinjiang regions are total phosphorus of 0.068, 0.005, 0.011, 0.005 mg/L; total nitrogen of 1.00, 0.16, 0.37, 0.60 mg/L; Secchi depth of 0.60, 8.00, 1.55, 3.00 m; and CODMn of 2.24, 1.00, 5.1 l, 4.00 mg/L, respectively. Moreover, a region-specific comprehensive trophic level index was developed to provide an understandable assessment method for the public. The results indicated that the frequency distribution analysis based on chlorophyll-a combined with trophic level index provided a useful metric for the assessment of the lake trophic status. In addition, the difference of eutrophication assessment standards in different lake regions was analyzed, which suggested that the sensitivities of algae to nutrients and the assessment standard of trophic status possessed significant regional differences for the four lake ecoregions. Lake eutrophication assessment standards would contribute to maximizing the effectiveness of future management strategies, to control and minimize lake eutrophication problems. 相似文献
189.
Qin Qilin Xu Xijin Dai Qingyuan Ye Kai Wang Chenyang Huo Xia 《Environmental geochemistry and health》2019,41(1):93-123
Environmental Geochemistry and Health - This paper reviews the concentrations of persistent organic pollutants (POPs) in atmosphere of an electronic waste (e-waste) recycling town, Guiyu, in... 相似文献
190.
研究了pH值、氯化钙投加量、搅拌时间及沉淀时间等因素对酸性高浓度含氟废水处理效果的影响;提出了采用氢氧化钙清液加氯化钙作为新型沉淀剂处理酸性高浓度含氟废水的工艺参数:pH值在8.5-9.5,按照nCa/F=0.7加入5%CaCl2溶液,搅拌45min、沉降90min;采用此工艺参数处理氟离子浓度为2600mg/L、pH值为2.97的废水,能把废水氟离子的浓度降至20mg/L以下,达到国家二级排放标准;采用本工艺取代传统工艺的好处是:沉渣中氟化钙纯度高,有利于废水中氟的回收利用。 相似文献