胶州湾营养盐的现状和变化

报道了１９９１年５月至１９９４年２月１２个航次胶州湾ＮＯ３－Ｎ，ＮＯ２－Ｎ，ＮＨ４－Ｎ，ＰＯ４－Ｐ和ＳｉＯ３－Ｓｉ的时空分布基本特征，６０年代于至９０年代的变化表明，胶州湾营养盐的浓度和分布已发生显变化。尤其从６０年代至８０年代，３０年来，胶州湾中东部水城ＰＯ４－Ｐ，ＮＯ３－Ｎ和ＮＨ４－Ｎ浓度分别增加２．２，７．３和７．１倍，ＴＯＮ浓度也增加了３．５倍，ＴＩＮ／ＰＯ４－Ｐ从１０增加至２４．２；Ｔ     

三疣梭子蟹溞状Ⅰ期幼体的饥饿实验

通过观察不同饥饿胁迫处理对三疣梭子蟹(Portunus trituberculatus)溞状Ⅰ期幼体变态和发育的影响,研究了其营养储存饱和点(the point of reserve saturation,PRS)和不可恢复点(the point of no return,PNR)现象的发生情况.结果表明:以轮虫为饵料,三疣梭子蟹溞状Ⅰ期幼体(ZⅠ)在前期投喂后期饥饿的条件下,随着前期摄食时间的增加,幼体变态率和发育速度呈上升趋势,50%营养储存饱和点(PRS50)出现在47.5 h,100%营养储存饱和点(PRS100)出现在72 h;在前期饥饿后期投喂的条件下,随着前期饥饿时间的增加,幼体变态率和发育速度呈下降趋势,50%不可恢复点(PNR50)出现在39 h,100%不可恢复点(PNR100)出现在56 h.     

Design of environmental decision support system and its application to water quality management

1 IntroductionEnvironmental decision support systems could be divided into two categories by their organizational form and system functions. One is regional environmental analytical system based on commercial GIS and assisted by environmental models, such as BASINS developed by the American NEPA using ARC/VIEW as its user platform and including QUAL2E and NPSM as its prediction tools. The other is environmental information and prediction system based on mathematical models, such as…     

http://www.sciencedirect.com/science/article/pii/S1674987110000058

<正>The thermo-electric coefficients of twenty-six magnetite samples,formed either by magmatism or metamorphism,were tested by the thermo-electric instrument BHET—06.Results showed that the coefficient is of a constant value of about -0.05 mV/℃.It is emphasized that because every magnetite grain was tested randomly,the coefficient is independent of the crystallographic direction.This fact means the thermal voltage generated from a single magnetite crystal can be accumulated,and as a result a new thermo-electric field can arise when a gradient thermal field exists and is active within the earth's crust.Because magnetite is widespread in the earth's crust(generally appearing more in the middle-lower crust),there is more-than-random probability that the additional thermo-electric field can be generated when certain thermal conditions are fulfilled.We,therefore,used the thermo-electric effect of magnetite to study the mechanism responsible for the presence of abnormal geo-electric fields during earthquake formation and occurrence, because gradient thermal fields always exist before earthquakes.The possible presence of additional thermo-electric fields was calculated under theoretical seismological conditions,using the following calcu-lation formula:E= - 0.159(σ×△T×φ×ρ_2×[(h~2-2x~2)cosα+ 3hxsinα]/ρ_1(h~2 +x~2)~(5/2)).In the above formula,σis thermo-electric coefficient of magnetite,△T is the temperature difference acting on it,φis a sectional area on a block of magnetite vertically perpendicular to the direction of the thermal current.ρ_1 andρ_2 are the respective resistivities of magnetite and the crust,and h,α,and x,respectively,h is the depth of embedded magnetite block,αmeans the angle created by the horizontal line and ligature of the two poles of magnetite block,and x is the distance from observation point to projective center point of the magnetite block on earth surface.According to simulations calculated with this formula,additional thermo-electric field intensity may reach as high as n to n×10~2 mV/km.This field is strong enough to cause obvious anomalies in the background geo-electric field,and can be easy probed by earthquake monitoring equipment. Therefore,we hypothesize that geo-electric abnormalities which occur during earthquakes may be caused by the thermo-electric effect of magnetite.     

吉林省最高最低气温非对称变化时空演变特征

利用吉林省45个气象站1970-2014年逐日的最高、最低气温资料,分析吉林省最高、最低气温不对称变化在年、季尺度上的时空演变特征。采用经验模态分解法(EMD)分解年、季最高、最低气温序列,分析变化趋势。结果表明:近45年年平均最高、最低气温均呈增加趋势,且最低气温增幅是最高气温的两倍。四季的最高、最低气温变化形式与年变化一致;不同地区之间最高气温的增幅差异不大,最低气温增幅存在一定区别,东部最低气温增幅小于中、西部。相对稳定的增温区出现在西部和中部,不同季节的增温幅度不同,春、夏要强于秋、冬。经验模态分解(EMD)结果显示吉林省年平均最高、最低气温均为增加趋势,而春、冬季中最高气温趋势分量的倾向率与原始序列不同,为负值。夏、秋季中最高气温及四季中最低气温趋势分量序列与原始数据序列的倾向率一致,均为正值但大小存在差异。     

地面气象测报业务试题库自动化管理系统

将地面气象观测规范、地面气象观测、气象学等多项知识形成题库,利用VB6编程、Access 2003数据库及Word 2003文字处理软件,研制了地面气象测报业务试题库自动化管理系统,实现了以下主要功能:用户管理、数据库管理、试题库维护、自动生成试卷、试卷编辑打印。着重阐述该系统的设计思路、技术方法、功能实现及使用效果。     

北京零售业的空间分布及影响因素

零售业是生活性服务业的重要组成部分,传统零售业通常通过零售商业网点形式展开。零售商业网点具有数量多、分布广、差异大等特点,其区位选择不仅影响居民的生活品质,也关乎商业网点空间布局的合理性。北京中心城区的零售业整体及其各细分行业均呈现出显著的空间集聚态势,集聚中心主要沿长安街及其延长线分布。影响零售业的区位选择因素包括交通通达性、地价成本、消费市场规模、消费偏好、政策引导、城市商业发展历史等。近年来,随着零售业与互联网的深度融合,零售业区位选择的影响因素及其作用方式不断发生变化,需要更多关注“新零售时代”对零售业空间布局的影响。     

地球磁极倒转的分形混沌研究

地球磁场多次发生南北(正负)磁极位置的变换,这已为大家所公认。但造成这种异常现象的原因,则是迄今未能很好解答的一个难题。应用分形混沌理论对地球磁极倒转进行了分析,认为发生地球磁极倒转时间段在时间轴上具有分形分布的性质;地球磁场系统通过不断与外界交换物质和能量,维持一种空间或时间的有序结构。地球磁场极性的随机倒转具有混沌运动的自逆转特性,混沌理论给地磁极性倒转提出了一个简明的动力机制解释。     

Quantitative Assessment of Impacts of Regional Climate and Human Activities on Saline-alkali Land Changes： A Case Study of Qian＇an County, Jilin Province

Interdecadal and interannual variations of saline-alkali land area in Qian’an County, Jilin Province, China were comprehensively analyzed in this paper by means of satellite remote sensing interpretation, field flux observations and regional climate diagnosis. The results show that on the interannual scale, the impact of climate factors accounts for 71.6% of the total variation of the saline-alkali land area, and that of human activities accounts for 28.4%. Therefore the impact of climate factors is obviously greater than that of human activities. On the interdecadal scale, the impact of climate factors on the increase of the saline-alkali land area accounts for 43.2%, and that of human activities accounts for 56.8%. The impact of human activities on the variation of saline-alkali land area is very clear on the interdecadal scale, and the negative impact of human activities on the environment should not be negligible. Besides, changes in the area of heavy saline-alkali land have some indication for development of saline-alkali land in Qian’an County.     

卵巢肿瘤之分类及CT诊断的价值

本文分析了５０例经病理证实的卵巢肿瘤。结果表明ＣＴ扫描在发现卵巢肿瘤方面是一种有效的手段，而且根据主要ＣＴ表现鉴别良恶性质是可能的．另一方面由于具有很高的密度分辨率，ＣＴ扫描在某种程度上低于传统的检查手段。