Increased summer electric power demand in Beijing driven by preceding spring tropical North Atlantic warming          下载免费PDF全文

Liwei Huo  Ji Wang  Dachao Jin  Jingjia Luo  Haibo Shen  Xiaoxiao Zhang  Jingjing Min  Yi Xiao 《大气和海洋科学快报》2022,15(1):62-67

本文利用北京市电力负荷资料,北京市站点观测温度资料,CN05.1温度资料,ERA5大气再分析资料及ERSST v3b海表温度资料,发现3-4月副热带北大西洋海温异常和北京市夏季电力呈很好的正相关关系,并揭示了副热带北大西洋海温异常影响北京市夏季电力的可能物理机制.春季副热带北大西洋海温异常偏暖,热带中太平洋出现东风异常...  相似文献   

PEAT GEOCHEMICAL MONITORING FORENVIRONMENTAL CHANGES     

朱颜明  杨爱玲  霍文毅 《中国地理科学(英文版)》1999,9(1):83-86

II~crIOWGlobalchangesisoneofthehotquestionscaredaboutbyacademiccircles.HoWtoidentifyandabstractinformationaboutenvironmentalchangeSisanurgenttechnicalkeyinthestudyofglobalchanges.Naturaltheiesusedbyhistoricgeochemicalmonitoringsuchasglacier,loess,limneticdepoSitionhavemanyadvantages,buttheyhavecertainlimitations.Inthequantitativestudiesofdifferentecologicalenvironmentchemicalstructuresofourcountry,wemeasuredalargenumberofplants'chemicalcompoSitionandfoundthatthecompoSingdifferencesOfplants…  相似文献   

The Hydrolyzation of Collagen by Fucoidan Oligosaccharide＇s Complex with CeⅣ     

XU Jiachao GAO Xin ZHANG Zhaohui LI Zhaojie HUO Lihua XUE Changhu 《中国海洋大学学报(英文版)》2006,5(2):151-156

Fucoidan is such a polysaccharide that its hydroxies are easy to combine with lanthanons ion （Ce^IV） to form complex. This work obtained the complexes of three fucoidan oligosaccharides with different molecular weights F1 （〉5 000）, F2 （1 000-5 000） and F3 （〈 1 000） by hydrolyzing Oligosaccharide collagen with sulfuric acid. It is found that the fucoidan oligosaccharide F3 can form complex with more Ce^IV than F1 and F2. Hydrolyzing collagen with the complex was carried out to produce amino acid and peptides. All the three fucoidan oligosaccharide complexes with CeIV（ F1, F2, F3） can catalyze by the artificial hydrolytic enzyme, and the activity of the complex of F3 is the highest.  相似文献   

Effect of substrate component on the growth and survival of juvenile sunray surf clam (<Emphasis Type="Italic">Mactra chinensis</Emphasis> Philippi)     

ZHANG Xuekai  LI Zhuang  HUO Zhongming  YAN Xiwu  YANG Feng  LIU Hui  ZHANG Xingzhi 《中国海洋大学学报(英文版)》2016,15(4):676-680

Substrate is a critical environmental factor affecting the activity of bivalves. To examine the effect of the substrate component on the growth and survival of juvenile sunray surf clam(Mactra chinensis Philippi), a series of short-term experiments were conducted using a variety of substrates with different ratios of sand to mud. The experimental group cultured without substrate showed poor survival, with all juveniles died after day 20. The juveniles cultured in mud without sand showed a lower survival rate(25.54% ± 0.40% on day 45) than those in other groups. The juveniles cultured in sand without mud, or the mixtures of sand and mud with a ratio of 1:1 and 2:1, respectively, exhibited modest survival at day 45. Maximal weight gain rate(WGR), shell length growth rate(LGR), and specific growth rate(SGR) were observed when the sand concentration was 61.97%, 77.69%, and 64.64%, respectively. As the fast growth and high survival were observed when the sand to mud ratio was 1:1(50% sand) and 2:1(67% sand), a sand concentration of more than 50% is optimal. The optimal concentration of sand in the substrate for rearing juvenile sunray surf clams was 67% which resulted in the fastest growth and highest survival. These results can be used to developing a nursery/farming technique of improving the yield of sunray surf clams.  相似文献   

Case Comparing Study of Downstream Circulation Development during Typhoon Extratropical Transition     

Chen Hua  Huo Ye 《地球科学进展》2016,31(4):409-421

The interaction between extratropical transition process and the mid-latitude jet system stimulates the downstream development. In this paper, three typhoon cases were selected to study their downstream development mechanism through the analysis of the eddy kinetic energy budget and the idealized simulations. The results of Chen’s work to the Pacific region were examined. The results were consistent with the results of Chen’s Atlantic hurricane Case. ET downstream at the upper levels generated first eddies, and the disturbances triggered the low level eddy development. Then the upper and the lower coupled and formed a deep cyclone system throughout the whole troposphere. The ageostrophic geopotential flux promoted the formation and development of the downstream ridge from the typhoon. Vertical ageostrophic geopotential flux transferred energy from upper downward that convergence happened in lower, which stimulated the lower-level cyclone development. Simulation results showed that, in the process of ET, TC outflow transported low potential vorticity to mid-latitude jet, which enhanced the PV gradient and the baroclinic. Then, it is inspired the Rossby wave in the jet and propagated downstream. The formation of downstream ridge-trough couple and development of the further wave was the spread to the downstream through the Rossby wave.  相似文献   

Risk assessment of shallow groundwater contamination under irrigation and fertilization conditions     

Xiaolin Zhang  Mei Sun  Neitian Wang  Zailin Huo  Guanhua Huang 《Environmental Earth Sciences》2016,75(7):603

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Information diffusion theory-based approach for the risk assessment of meteorological disasters in the Yangtze River Basin     

Xiaobing  Yu  Chenliang  Li  Tongzhao  Huo  Zhonghui  Ji 《Natural Hazards》2021,106(3):2337-2352

Natural Hazards - Hazard mitigation plans (HMP) inform residents and policymakers of the risks a community is vulnerable to, as well as prioritize measures implemented to minimize hazard damage....  相似文献   

Discovery of lacustrine shale deposits in the Yanshan Orogenic Belt,China:Implications for hydrocarbon exploration     

Yuanfu Zhang  Xiaodong Yuan  Min Wang  Pengcheng Ge  Yancui Huo  Jie Xu  Jianguo Zhang  Jian Cheng  Zaixing Jiang 《地学前缘(英文版)》2021,12(6):326-353

The mechanism of formation of lacustrine deposits within stable orogenic belts and their potential for shale oil and gas exploration are frontier themes of challenge in the fields of sedimentology and petro-leum exploration.Orogenic belts witness strong tectonic activities and normally cannot host stable lacus-trine basins and deep shale formations.Therefore,basins in orogenic belts are considered to have no potential to form shale hydrocarbon reservoirs.Here we investigate the Luanping Basin located in the Yanshan orogenic belt where previous studies regarded rivers and fan deltas as the major main Mesozoic deposits.Based on detailed field exploration and scientific drilling,we report the finding of a large number of lacustrine shale continental deep-water deposits in the Mesozoic strata.Our finding of the occurrence of active shale oil and gas also in this basin also subvert the previous perceptions.We report SHRIMP zircon U-Pb age that define the bottom boundary of the target interval as 127.6±1.7 Ma belonging to the early Cretaceous strata.Tectonics and climate are considered to be the main factors that controlled the deep-water sedimentation during this period.The drill cores revealed evidence of shale gas and the TOC of shale is 0.33％-3.60％,with an average value of 1.39％and Ro is 0.84％-1.21％,with an average value of 1.002％.The brittleness index of shale is between 52.7％and 100％.After vertical well fracturing,the daily gas production is more than 1000 m3.Our findings show that the basin has consid-erable potential for shale oil and gas.The geological resources of the shale gas in the Xiguayuan Fm.are estimated as 1110.12 × 108 m3,with shale oil geological resources of 3340.152×104t.Our findings indi-cate that the Yanshan orogenic belt has potential exploration prospect.This work not only redefines the Luanping Basin as a rift deep-water Mesozoic Lake Basin,but also rules out the previous notion that the basin is dominated by shallow water sediments.The discovery of shale oil and gas also provides an important reference for subsequent petroleum exploration and development in this basin.Our study shows that shale oil and gas reservoirs can be found in the lacustrine basins of orogenic belts which were strongly influenced by volcanism.These results have significant implications for the sedimentology and oil exploration in the Qinling and Xingmeng Orogenic Belts of China,as well as those in other terranes of the world including the New England Orogenic Belt in Australia.  相似文献   

An accelerated direct demodulation method for image reconstruction using spherical data from the hard X-ray modulation telescope     

Zhuo-Xi Huo  Jian-Feng Zhou 《天文和天体物理学研究(英文版)》2013,(8):991-1012

The hard X-ray modulation telescope (HXMT) mission is mainly devoted to performing an all-sky survey at 1 250 keV with both high sensitivity and high spatial resolution. The observed data reduction as well as the image reconstruction for HXMT can be achieved by using the direct demodulation method (DDM). However the original DDM is too computationally expensive for multi-dimensional data with high resolution to be employed for HXMT data. We propose an accelerated direct demodulation method especially adapted for data from HXMT. Simulations are also presented to demonstrate this method.  相似文献   

2010年陕西主要气象灾害及灾情年景评估     

雷向杰  李茜  梁奇琛 《陕西气象》2012,(2):27-29

针对侯马市气象局地面测报工作任务越来越多,工作质量要求不断提高,人工计算已不能满足需求。因此从实际工作出发,基于VB（Visual Basic）6．0平台,开发了侯马市地面测报质量基数计算程序。该程序可计算值班人员当月的各类工作基数,并将结果直接输出成Excel电子表格,用以数据的保存、统计分析与打印。  相似文献