广西山地风能资源开发利用可行性分析——以大容山为例

利用大容山自动观测站2004年8月～2006年7月气象观测资料和容县气象站1958～2006年7月测风资料,对大容山的风能资源各参数进行了详细计算和分析,并结合预选风电场的地形地貌、交通运输、联网条件、环境保护等状况对大容山风能资源开发利用进行了可行性分析评价.结果表明：大容山年平均风速为7.2m/s,年平均风功率密度为390.8W/m^2,其风能资源丰富,且交通运输、联网、工程地质等条件较好,可选择在坡度较小的山头或山腰建设风电场,预选风电场可布置750kW的风机45台,总装机容量约为34MW.     

Direct Propagation of Photospheric Acoustic <Emphasis Type="Italic">p</Emphasis> Modes into Nonmagnetic Solar Atmosphere

Solar p modes are one of the dominant types of coherent signals in Doppler velocity in the solar photosphere, with periods showing a power peak at five minutes. The propagation (or leakage) of these p-mode signals into the higher solar atmosphere is one of the key drivers of oscillatory motions in the higher solar chromosphere and corona. This paper examines numerically the direct propagation of acoustic waves driven harmonically at the photosphere, into the nonmagnetic solar atmosphere. Erdélyi et al. (Astron. Astrophys. 467, 1299, 2007) investigated the acoustic response to a single point-source driver. In the follow-up work here we generalise this previous study to more structured, coherent, photospheric drivers mimicking solar global oscillations. When our atmosphere is driven with a pair of point drivers separated in space, reflection at the transition region causes cavity oscillations in the lower chromosphere, and amplification and cavity resonance of waves at the transition region generate strong surface oscillations. When driven with a widely horizontally coherent velocity signal, cavity modes are caused in the chromosphere, surface waves occur at the transition region, and fine structures are generated extending from a dynamic transition region into the lower corona, even in the absence of a magnetic field.     

论四川盆地丘陵区防护林体系的建设

四川盆地丘陵区,人多地少,资源贫乏,经济不发达,生态环境质量低劣,因而建设具有生态效益、经济效益和社会效益的防护林体系很有必要。建设本区防护林体系的原则应是:共生,布局与结构合理,土地资源充分利用和总体最优。经采取切实有效的措施后,最终建成一个良性农田生态防护林网络体系,以协调当地人口、资源、经济和环境之间的关系,并使其日臻完善。     

Effect of parallel electric field on electrostatic ion-cyclotron instability in anisotropic plasma in the presence of ion beam and general distribution function—Particle aspect analysis

Dispersion relation, resonant energy transferred, growth rate and marginal instability criteria for the electrostatic ion-cyclotron wave with general loss-cone distribution in low-β anisotropic, homogeneous plasma in the auroral acceleration region are discussed by investigating the trajectories of the charged particles. Effects of the parallel electric field, ion beam velocity, steepness of the loss-cone distribution and temperature anisotropy on resonant energy transferred and growth rate of the instability are discussed. It is found that the effect of the parallel electric field is to stabilize the wave and enhance the transverse acceleration of ions whereas the effect of steepness of loss-cone, ion beam velocity and the temperature anisotropy is to enhance the growth rate and decrease the transverse acceleration of ions. The steepness of the loss-cone also introduces a peak in the growth rate which shifts towards the lower side of the perpendicular wave number with the increasing steepness of the loss-cone.     

东昆仑地区中生代熔融、同化、存储和均一(MASH)过程及壳幔岩浆混合

哈西亚图石英闪长岩是东昆仑地区中生代具幔源组分贡献的花岗岩类典型代表,岩体出露于东昆仑中构造带,广泛发育暗色微粒包体。包体为闪长质岩石,并含有一系列岩浆混合成因的证据,如水滴状、长条状塑性流变外形,淬冷边、反向脉等高—中温混合迹象,以及低Mg/(Fe+Mg)、Na/(Ca+Na)值等混合成因特征。包体A/CNK值介于0.77~0.87,属准铝质,富Al2O3、Fe2O3、MgO,贫K2O、Na2O,富集大离子亲石元素(Rb、Ba、K等),同时又具有Ta、Nb、Ti的"TNT"负异常,具有俯冲带幔源岩石的成分特点。依据岩石学、地球化学特征并结合同时期大地构造背景,东昆仑晚古生代—早中生代含暗色微粒包体花岗质岩石是幔源岩浆经历多次熔融、同化、存储和均一(MASH)过程后与壳源岩浆混合的产物。在混合岩浆中,富镁铁质端元是由辉长质岩浆进化而来的闪长质岩浆。     

利用InSAR技术获取高寒高海拔地区高精度DEM

本文以Sentinel-1A SLC数据为原始影像,利用InSAR技术获取新疆西天山中部高寒高海拔地区小区域DEM,将获得的DEM与常用的SRTM v4 DEM和GDEMDEM进行对比分析。结果表明：利用InSAR技术处理Sentlnel-1A SLC数据可以获得分辨率为15 m的高精度DEM,该DEM数据精度优于SRTM v4 DEM和GDEMDEM,能更好地描绘地表地形细节,可作为输入数据获取地面高精度形变信息,为工程建设和地质灾害评价提供重要的基础数据。此外,该方法对DEM数据的更新也具有重大意义。     

The heating of the solar transition region

The temperature curve in the solar chromosphere has puzzled astronomers for a long time.Referring to the structure of supergranular cells,we propose an in ductive heating model.It mainly includes the following three steps.(1) A small-scale dynamo exists in the supergranulation and produces alternating small-scale magnetic fluxes;(2) The supergranular flow distributes these small-scale fluxes according to a regular pattern;(3) A skin effect occurs in the alternating and regularly-distributed magnetic fields.The induced current is concentrated near the transition region and heats it by resistive dissipation.     

Further birth records of elephant seals Mirounga leonina in New Zealand (note)

The second and third recorded births of southern elephant seals Mirounga leonina on the mainland of New Zealand occurred at Kaikoura in mid‐October 1976. One female pup died within 14 d of birth and the other (sex unknown) disappeared from the region with its mother on 19 November 1976.     

琼东南盆地南部中新统“丘”形反射成因探讨

在琼东南盆地南部中新统梅山组广泛发育“丘”形反射, 对其识别分析具有重要的意义。这些“丘”形反射主要分布在北礁凹陷及周缘斜坡带上, 在顶底界面呈强反射, 在内部成层、杂乱或为空白反射, 有时在顶部见披覆沉积, 从盆地中心北礁凹陷向边缘斜坡带迁移生长。通过对“丘”形反射的古构造和古地理背景、几何学特征及地震响应特征等方面综合分析, 对其成因进行了探讨, 排除了其为生物礁、泥底辟以及火山丘的可能, 认为其可能为深水环境底流作用下形成的等深流沉积或某种沉积物波。     

Metallogenic mechanisms of super-large Cu and Au deposits in the Dexing region and simulating experiments

Based on the results of previous studies and under the direction of the theory of “ore deposit genesis”, the authors made use of high temperature and high pressure experimental facilities and conditions at the Tectono-geochemistry Research Room under the State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, and put the focus on the multi-source of tectonically controlling ore-forming materials, the characteristics of multi-stage and multi-episode hydrothermal activities and mineralization and the characteristics of multi-genesis and multi-ore deposition so as to shed light on the metallogenic mechanisms of super-large Cu and Au deposits. In addition simulating experiments were made on multi-stage and multi-episode tectonic activities and rock and ore deformation, multi-stage and multi-episode tectonic activities and mobilization and migration of ore-forming materials, and multi-stage and multi-episode tectonic activities and superimposition and enrichment of ore-forming materials. The experimental results showed that under the action of multi-stage and multi-episode tectonic stress the deformation and fragmentation of not only rocks and ores have been intensified, and but also the ore-forming materials originally disbursed in the rocks and ores have been mobilized and migrated and superimposed and enriched. The experimental results also provided the scientific experimental data and grounds for deep-going research on the rules of metallogenesis and geneses of super-large ore deposits in the Dexing region, Jiangxi Province.