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131.
132.
采用2018年敦煌莫高窟第16窟窟内与窟区PM10浓度及气象数据,分析PM10时空分布特征及其影响因素。结果表明:(1)两处监测点PM10浓度主要分布在50 μg·m-3以下,受重污染天气影响较小;春、冬、秋、夏季依次降低,窟区PM10浓度在春、冬季高于窟内,夏、秋季反之。(2)PM10浓度3月最高,9月最低,5—9月窟内月均值高于窟区。PM10污染日数窟内5月最多,而窟区3、5月较多。(3)PM10浓度日变化曲线在春季和秋季呈“双峰”型,夏季和冬季呈“单峰”型。(4)在半封闭环境的洞窟内,沙尘暴发生前后,PM10浓度达到极值及恢复至原来水平的时间均滞后于窟区。(5)在不同季节PM10浓度与气温、风速和降水呈负相关。除秋季外,PM10浓度与相对湿度、气压呈正相关。(6)窟区全年主风向为ESE,在冬春两季,此风向PM10浓度最高,PM10主要来自三危山前的戈壁滩、干涸的大泉河河道以及窟前裸露的地表积尘。 相似文献
133.
Distribution, variation and impact factors of biomass of bacterioplankton from April to May 1999 in Bohai Sea were studied in DAPI method with epifluorescence microscopy. The biomass in surface waters showed a small day-night variation, varying from 0.13 to 2.51μg/dm^3 with an average of 0.84μg/dm^3. The biomass in bottom waters showed, however, a large variation, changing from 0.15 to 4.18μg/dm^3 with an average of 1.36μg/dm^3. The peak values occurred at 5 and 11 a.m. The bottom water biomass showed a significant correlation with particulate organic carbon (r=0.639, P〈0.05). Heterotrophic bacterioplankton biomass was high in nearshore waters and low in offshore areas with a high biomass zone around Huanghe (Yellow) River mouth, showing the same distribution of nutrients. In vertical distribution, heterotrophic bacteria biomass in bottom waters was higher than that in surface water. 相似文献
134.
135.
Hongrun Ju Lijun Zuo Jinfeng Wang Shengrui Zhang Xiao Wang 《International journal of geographical information science》2016,30(11):2188-2207
Scientific interpretation of the driving forces of built-up land expansion is essential to urban planning and policy-making. In general, built-up land expansion results from the interactions of different factors, and thus, understanding the combined impacts of built-up land expansion is beneficial. However, previous studies have primarily been concerned with the separate effect of each driver, rather than the interactions between the drivers. Using the built-up land expansion in Beijing from 2000 to 2010 as a study case, this research aims to fill this gap. A spatial statistical method, named the geographical detector, was used to investigate the effects of physical and socioeconomic factors. The effects of policy factors were also explored using physical and socioeconomic factors as proxies. The results showed that the modifiable areal unit problem existed in the geographical detector, and 4000 m might be the optimal scale for the classification performed in this study. At this scale, the interactions between most factors enhanced each other, which indicated that the interactions had greater effects on the built-up land expansion than any single factor. In addition, two pairs of nonlinear enhancement, the greatest enhancement type, were found between the distance to rivers and two socioeconomic factors: the total investment in fixed assets and GDP. Moreover, it was found that the urban plans, environmental protection policies and major events had a great impact on built-up land expansion. The findings of this study verify that the geographical detector is applicable in analysing the driving forces of built-up land expansion. This study also offers a new perspective in researching the interactions between different drivers. 相似文献
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137.
Yongjuan Cha Xiong Zhang Haojin Zhang Dingrong Xiong Wenguang Liu Bijun Li Jin Li Liansha Lei 《Astrophysics and Space Science》2013,346(1):19-30
Using γ-ray data detected by Fermi Large Area Telescope (LAT) and multi-wave band data for 35 TeV blazars sample, we have studied the possible correlations between different broad band spectral indices ( $\alpha_{\rm r.ir}$ , $\alpha_{\rm{r.o}}$ , $\alpha_{\rm r.x}$ , $\alpha_{\rm r.\gamma}$ , $\alpha_{\rm{ir.o}}$ , $\alpha_{\rm ir.x}$ , $\alpha_{\rm ir.\gamma}$ , $\alpha_{\rm o.x}$ , $\alpha_{\rm o.\gamma}$ , $\alpha_{\rm r.x}$ , $\alpha_{\rm x.\gamma}$ ) in all states (average/high/low). Our results are as follows: (1) For our TeV blazars sample, the strong positive correlations were found between $\alpha_{\rm r.ir}$ and $\alpha_{\rm{r.o}}$ , between $\alpha_{\rm r.ir}$ and $\alpha_{\rm r.x}$ , between $\alpha_{\rm r.ir}$ and $\alpha_{\rm r.\gamma}$ in all states (average/high/low); (2) For our TeV blazars sample, the strong anti-correlations were found between $\alpha_{\rm r.ir}$ and $\alpha_{\rm x.\gamma}$ , between $\alpha_{\rm{r.o}}$ and $\alpha_{\rm ir.\gamma}$ , between $\alpha_{\rm{r.o}}$ and $\alpha_{\rm o.\gamma}$ , between $\alpha_{\rm{r.o}}$ and $\alpha_{\rm x.\gamma}$ , between $\alpha_{\mathrm{ir.o}}$ and $\alpha_{\rm o.\gamma}$ , between $\alpha_{\rm r.x}$ and $\alpha_{\rm x.\gamma}$ , between $\alpha_{\rm ir.x}$ and $\alpha_{\rm x.\gamma}$ in all states (average/high/low). The results suggest that the synchrotron self-Compton radiation (SSC) is the main mechanism of high energy γ-ray emission and the inverse Compton scattering of circum-nuclear dust is likely to be a important complementary mechanism for TeV blazars. Our results also show that the possible correlations vary from state to state in the same pair of indices, Which suggest that there may exist differences in the emitting process and in the location of the emitting region for different states. 相似文献
138.
在本文中先简要介绍了80年代以来射电脉冲星方面的观测进展,然后详细介绍了射电脉冲星的第一手观测资料,包括空间分布,传播特性,时间特性,脉冲轮廓与偏振以及频谱特性等,并详细综述观测资料对我们提供的信息及给我们的启示,为理论模型的建立和检验提供了基础。 相似文献
139.
非线性半参数模型最小二乘核估计的直接解法 总被引:3,自引:3,他引:3
基于非线性半参数模型最小二乘核估计,给出了其参数分量和非参数分量估计的构造式,导出了参数分量和非参数分量顾及二次项直接解法的计算公式。用实测数据进行计算,证明了对于非线性半参数模型最小二乘核估计,可采用顾及二次项的直接解法。 相似文献
140.