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151.
??GPS???μ???У???????????·??Ч????????????????ν??????λ??????г????д??????????ν????????????λ??????????λ?????????????????λ????????????????????????GPS?????λ?е?????λ???ξ????????????????????????Kalman?????????к????????????y????????????RPDOP??????Kalman??????и???????Ч???? 相似文献
152.
????????????????????????????1998-01-10???????????o????Ч?????????????????????????λ?????????Ч?????????仯???????о?????????????????Ч?????????仯????“???λ??”????????????????????仯?????????????Ч????????仯??????????λ???????????????????? 相似文献
153.
根据厦门东孚井水氡多年的观测资料,分析了水氡异常与地震活动的关系。分析结果认为,该井点映震效果较好,特别是对发生在长乐-诏安断裂带上的地震,映震能力尤为明显。 相似文献
154.
Social capital has played an increasingly important role in regional development. China is a country with high stocks of social
capital. Using several different indicators of social capital, this study tries to research the regional disparities in social
capital and the influence of social capital on economic growth of China in 1978–2004. Measuring social capital with indicators
of associations, charities and blood donation rates, this study finds significant regional disparities in social capital at
provincial level in China. Those indicators for social capital are highly correlated with regional economic performance. Statistical
analysis shows that social capital has a significant and positive effect on a long-term provincial economic growth. This relationship
exists after controlling policy, macro location factors, and per capita GDP in the initial year. The empirical findings indicate
that institutions, culture and social relations are critical for regional development in China. Therefore, the creation and
support of social capital should be paid more attention to when making regional policy. 相似文献
155.
Seagrass research in China is still in its infancy. Even though there has been progress recently, there is still a great deal
of research needed to gain a better understanding of seagrass. In this article we review and discuss the advances in seagrass
research in China from two aspects: (1) seagrass species and their distribution; (2) seagrass research in China, including
studies on their taxonomy, ecology, photosynthesis, applications in aquaculture, salt-tolerance mechanisms and other research
topics. A total of 18 seagrass species belonging to 8 genera are distributed in nine provinces and regions in China (including
Hong Kong and Taiwan), as well as the Xisha and Nansha Archipelagos. They can be divided into two groups: a North China Group
and a South China Group. Based on the seagrass distribution, the Chinese mainland coast can be divided into three sections:
North China Seagrass Coast, Middle China Seagrass Coast, and South China Seagrass Coast. Ecological studies include research
on seagrass communities, nutrient cycling in seagrass ecosystems, genetic diversity, pollution ecology and research in the
key regions of Shandong, Guangdong, Guangxi, and Hainan. Seagrass species and their locations, community structure, ecological
evaluation, epiphytes, ecological functions and threats in the key regions are also summarized. Other studies have focused
on remote sensing of seagrass, threatened seagrass species of China, and pollen morphology of Halophila ovalis. 相似文献
156.
�촬���ȿ���ϵͳ������վ������ȡ��λ��Ϣ��һ�ַ��� 总被引:2,自引:0,他引:2
????????????У????????????乤??????????У??????????????λ??????????????????????????????????λ?????????????????????????ε??????λ??????????????????????Matlab GUI?????????????????????????ò??????????????????????????????????á? 相似文献
157.
ZHANG Lianjie ZHU Longhai WU Jianzheng HU Rijun WANG Peng ZHANG Pan 《中国海洋大学学报(英文版)》2020,19(1):101-112
The Liaodong Shoal is a group of linear sand ridges located in the east Bohai Sea of China.In this study,54 surface sediment samples have been collected,current measurements at 4 stations have been carried out and bathymetric data were obtained.The current directions are rightward deflected relative to the strikes of the sand ridges.Affected by the narrowing effect of the ridge,the current velocities exhibited an anti-‘C’type vertical profile.The velocities of the lower currents linearly correlate with the water depths.The near-bed current velocities over the troughs are estimated to be higher than those over the ridges,and this feature could be explained by the loss of kinetic energy together with the conversion between kinetic energy and gravitational potential energy.The sedimentary characteristics that are compatible with the tidal dynamics are developed across the ridges and troughs,including grain size compositions,grain size parameters,mineral compositions and Dhm indexes.The existence of the angles between the current directions and the strikes of the sand ridges is the key factor for the growth of the sand ridges.The asymmetric hydrodynamic features between the flood and ebb currents lead to the differences in the topographical and sedimentary characteristics on both sides of a sand ridge.Insufficient material supply led to the degradation of the sand ridges,and the reduction of the tidal current intensity has led to the development of the subordinate sand ridges in the troughs.Sand ridges are migrating. 相似文献
158.
Based on the 18-year(1993–2010) National Centers for Environmental Prediction optimum interpolation sea surface temperature(SST) and simple ocean data assimilation datasets,this study investigated the patterns of the SST anomalies(SSTAs) that occurred in the South China Sea(SCS) during the mature phase of the El Ni?o/Southern Oscillation.The most dominant characteristic was that of the outof-phase variation between southwestern and northeastern parts of the SCS,which was influenced primarily by the net surface heat flux and by horizontal thermal advection.The negative SSTA in the northeastern SCS was caused mainly by the loss of heat to the atmosphere and because of the cold-water advection from the western Pacific through the Luzon Strait during El Ni?o episodes.Conversely,it was found that the anomalous large-scale atmospheric circulation and weakened western boundary current during El Ni?o episodes led to the development of the positive SSTA in the southwestern SCS. 相似文献
159.
Risk assessment of maize drought disaster in southwest China using the Environmental Policy Integrated Climate model 总被引:2,自引:0,他引:2
The East Asian monsoon has a tremendous impact on agricultural production in China. An assessment of the risk of drought disaster in maize-producing regions is therefore important in ensuring a reduction in such disasters and an increase in food security. A risk assessment model, EPIC(Environmental Policy Integrated Climate) model, for maize drought disasters based on the Erosion Productivity Impact Calculator crop model is proposed for areas with the topographic characteristics of the mountainous karst region in southwest China. This region has one of the highest levels of environmental degradation in China. The results showed that the hazard risk level for the maize zone of southwest China is generally high. Most hazard index values were between 0.4 and 0.5,accounting for 47.32% of total study area. However,the risk level for drought loss was low. Most of the loss rate was 0.1, accounting for 96.24% of the total study area. The three high-risk areas were mainlydistributed in the parallel ridge–valley areas in the east of Sichuan Province, the West Mountain area of Guizhou Province, and the south of Yunnan Province.These results provide a scientific basis and support for the reduction of agricultural drought disasters and an increase in food security in the southwest China maize zone. 相似文献
160.
The objective of this study was to examine the effect of benzo[a]pyrene(Ba P) on the detoxification and antioxidant systems of two microalgae,Isochrysis zhanjiangensis and Platymonas subcordiformis.In our study,these two algae were exposed to Ba P for 4 days at three different concentrations including 0.5 μg~(L-1)(low),3 μg~(L-1)(mid) and 18 μg~(L-1)(high).The activity of detoxification enzymes,ethoxyresorufin O-deethylase(EROD) and glutathione S-transferase(GST) increased in P.subcordiformis in all Ba P-treated groups.In I.zhanjiangensis,the activity of these two enzymes increased at the beginning of exposure,and then decreased in the groups treated with mid-and high Ba P.The activity of antioxidant enzyme superoxide dismutase(SOD) increased in I.zhanjiangensis in all Ba P-treated groups,and then decreased in high Ba P-treated group,while no significant change was observed in P.subcordiformis.The activity of antioxidant enzyme catalase(CAT) increased in I.zhanjiangensis and P.subcordiformis in all Ba Ptreated groups.The content of malondialdehyde(MDA) in Isochrysis zhanjiangensis increased first,and then decreased in high Ba P-treated group,while no change occurred in P.subcordiformis.These results demonstrated that Ba P significantly influenced the activity of detoxifying and antioxidant enzymes in microalgae.The metabolic related enzymes(EROD,GST and CAT) may serve as sensitive biomarkers of measuring the contamination level of Ba P in marine water. 相似文献