生长素QS在钝顶螺旋藻养殖中的应用

钝段螺旋藻（Ｓｐｉｒｕｌｉｎａ ｐｌａｔｅｎｓｉｓＧｅｉｔｌｅｒ）培养在低浓度ＮａＨＣＯ３（２～５ｇ／ｄｍ＾３）和适量生长素ＱＳ（０．５～５ｍｇ／ｄｍ＾３）中,研究了生长素ＱＳ对钝顶螺旋藻生长、生物量和生化组成的影响,结果表明,在生长素ＱＳ为１ｍｇ／ｄｍ＾３,ＮａＨＣＯ３浓度为５ｇ／ｄｍ＾３时,钝顶螺旋藻的生长最好,生物量、蛋白质及总碳水化合物的含量也与主浓度ＮａＨＣＯ３（８ｇ／ｄｍ＾３）培养条件下的基本相同,说明生物素ＱＳ的加入在一定程度上可降低ＮａＨＣＯ３的使用量,而不影响钝顶螺旋藻生长、生物量和生化组成。因而生长素ＱＳ在钝顶螺旋灌的养殖中可作为ＮａＨＣＯ３部分替代剂,从而达到降低养殖成本的目的。     

中国地理信息系统(GIS)发展状况的初步调查——由一组统计数据引起的思考

本文整理和统计了一组与中国GIS研究、教育、产业和市场相关的数据, 用于理解和评估中国的GIS产业状况和应用前景。     

江南华南暴雨频繁东北大部干旱少雨——2007年6月——

6月,全国平均降水量接近常年同期,略偏少,平均气温比常年同期异常偏高。华南、江南局部地区发生暴雨洪涝灾害;宁夏、青海、内蒙古中部降水异常偏多;辽宁、吉林等地温高雨少,出现严重初夏旱;月内东北地区西部、华北、黄淮、江南、华南及内蒙古大部、新疆等地都出现了高温酷热天气;6月下旬,江淮梅雨出现;局地强对流天气较频繁,江西、浙江发生重大雷击事件;月内无热带气旋生成。     

对日照市农村居民点用地整理模式的思考

1农村居民点的基本情况日照市现辖东港区、岚山区、莒县、五莲县4区县,2005年全市共有54处乡(镇、街道办事处),90个居委,2909个行政村,农业人口186.31万人,农村居民点用地面积36077.07hm2,人均193.64hm2,超出国家规定的人均150m2的上限标准。在农村居民点用地构成中有宅基地、工业和商业用地、宅旁绿地、街巷道路、公用设施用地和未利用地等,其中面积最大是宅基地,面积最小的是绿地,农村居民点用地中存在一定比例的工业用地和未利用土地,这也是造成农村居民点用地过大的原因之一。2农村居民点用地存在的问题(1)农村居民点用地布局分散、基础…     

Pigment characterization for the 2011 bloom in Qinhuangdao implicated "brown tide" events in China

A large-scale bloom occurred from May to June in 2011 in sea area near Qinhuangdao of the Bohai Sea, leading to huge damage of the scallop culture industry. Similar blooms have been observed in this region for three years. The causative species of the bloom, which dominated the phytoplankton community with the maximum cell density around 109 cell/L, could not be identified with morphological features due to the small cell size (~2 mm). A pigment analytical method was then adopted to analyze the pigment profile of the phytoplankton samples collected from the blooming sea area. It was found that pico-sized (<2 mm), nano-sized (2-20 mm), and bulk phytoplankton samples had similar pigment profile, representing the pigment signature of the bloom-causative species. The major pigments detected included 19-butanoyloxyfucoxanthin (But-fuco), fucoxanthin (Fuco), diadinoxanthin (Diad) and chlorophyll a (Chl a), and high content of But-fuco was the most significant characteristics of the phytoplankton samples. Based on the pigment composition and content, the bloom-causative species could be tentatively identified as pelagophyte, "type 8" group of haptophyte, or silicoflagellate. Some unique features of the bloom, such as the extremely high cell density, small-sized and But-fuco containing cells, occurring in early summer, and the feeding-cessation effects on scallops, suggest it be a "brown tide" event similar to those reported in the east coast of the United States of America. The recurrent "brown tide" events and their dramatic impacts on the shellfish mariculture industry in Qinhuangdao need close attention in the coming years.     

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北极海冰消融情景下东北航道通航性能演变分析

全球气候增暖,导致北极海冰消融加速,冰上丝绸之路的开通逐渐提上日程.本文针对2030-2070年俄罗斯8个重要港口通过东北航道到达白令海峡的通航性能,采用6种CMIP5气候模式在2种排放情景下的海冰数据,以及PC6破冰船和普通商船2种船型,分别对最优航线、通航时长、可通航里程以及通航成本4项要素进行研究.主要结论为:①...     

青海某地软玉的宝石学特征

青海软玉产于花岗岩与大理岩的内接触带。与和田玉、花莲玉相比，化学成分表现高ＣａＯ，低Ａｌ２Ｏ３、ＴＦｅ、Ｎａ２Ｏ等特点；矿物成分以透闪石为主，含少量白云石、滑石等，颜色多呈白色、淡绿色，赤有灰白、暗绿等色，油脂光泽，半透明至不透明，平均比重２．９４，平均硬度５．９５×１０８ｋｇ／ｍ２，折射率１．６２３～１．６２２。块度大、裂纹少，具良好的加工工艺性能。     

中国二八面体含铝蒙皂石矿物化学和晶体化学的特征

通过对我国６４个二八面体含铝蒙皂石矿物化学及晶体化学数据的统计分析，研究了它们的矿物化学及晶体化学的基本特征，并得出八面体组分是影响蒙皂石矿物学及物理化学性质的主要因素，在此基础上，利用ＡｌＡｌ－ＡｌＦｅ－ＡｌＭｇ三角图划分了我国二八面体含铝蒙皂石的晶体化学类型，并对原分类图进行了模式化处理，使ＡｌＡｌ－ＡｌＦｅ－ＡｌＭｇ图更具实际意义，蒙皂石的阳离子交换容量与晶体化学模型有对应性，并受八面体三价     

Cracking mechanisms during galena mineralization in a sandstone-hosted lead–zinc ore deposit: case study of the Jinding giant sulfide deposit, Yunnan, SW China

There are two types of lead–zinc ore bodies, i.e., sandstone-hosted ores (SHO) and limestone-hosted ores (LHO), in the Jinding giant sulfide deposit, Yunnan, SW China. Structural analysis suggests that thrust faults and dome structures are the major structural elements controlling lead–zinc mineralization. The two types of ore bodies are preserved in two thrust sheets in a three-layered structural profile in the framework of the Jinding dome structure. The SHO forms the cap of the dome and LHO bodies are concentrated beneath the SHO cap in the central part of the dome. Quartz, feldspar and calcite, and sphalerite, pyrite, and galena are the dominant mineral components in the sandstone-hosted lead–zinc ores. Quartz and feldspar occur as detrital clasts and are cemented by diagenetic calcite and epigenetic sulfides. The sulfide paragenetic sequence during SHO mineralization is from early pyrite to galena and late sphalerite. Galena occurs mostly in two types of cracks, i.e., crescent-style grain boundary cracks along quartz–pyrite, or rarely along pyrite–pyrite boundaries, and intragranular radial cracks in early pyrite grains surrounding quartz clasts. The radial cracks are more or less perpendicular to the quartz–pyrite grain boundaries and do not show any overall (whole rock) orientation pattern. Their distribution, morphological characteristics, and geometrical relationships with quartz and pyrite grains suggest the predominant role of grain-scale cracking. Thermal expansion cracking is one of the most important mechanisms for the generation of open spaces during galena mineralization. Cracking due to heating or cooling by infiltrating fluids resulted from upwelling fluid phases through fluid passes connecting the SHO and LHO bodies, provided significant spaces for crystallization of galena. The differences in coefficients of thermal expansion between pyrite and quartz led to a difference in volume changes between quartz grains and pyrite grains surrounding them and contributed to cracking of the pyrite grains when temperature changed. Combined thermal expansion and elastic mismatch due to heating and subsequent cooling resulted in the radial and crescent cracking in the pyrite grains and along the quartz–pyrite grain boundaries.