Spatial gradient analysis of urban green spaces combined with landscape metrics in Jinan City of China

1IN T R O D U C T IO NUrban green spaces can be consideredas the outdoorplacesintheurban covered with significanatmounts ofvegetation,naturalor manmade,as opposed to areasthatare paved or having buildingon them(JIM andC HEN,2003;SHIVANAND and SUZANA,2005)…     

山东省东西部地区差距衡量指标体系及测算分析

笔者认为 ,通常所说的地区差距应该是指经济、社会以及影响经济和社会发展的各方面要素的差距组成的“集合体” ,即区域间社会经济综合实力水平的差距。基于对地区差距的这一理解 ,在定性分析的基础上 ,提出一套以定量为主、定性与定量相结合的地区差距衡量指标体系及定量化测算方法 ,并运用它对山东省东西部地区之间的差距进行定量计算和分析比较。     

陕西省气象标准化工作探讨

根据山西省气象局党组的安排，我于2004年10月20日至12月20日赴安徽省池州市气象局挂职学习。按照安徽省气象局人事教育处文件任命，挂职期间任池州市气象局党组成员、副局长。通过2个月的调研学习，池州市气象局给我留下的深刻印象是：领导班子团结和谐，扎实苦干；思想解放，不甘落后；职工凝心聚力，团队意识强；对外依法管理，对内科学管理；无论是气象业务，还是科技服务，省局起到了龙头的带动作用，池州市局紧紧抓住机遇，在现代化建设上和科技服务发展上，紧跟龙头上下联动，使池州气象事业不断向前发展。     

6710铀矿区火成岩的地球化学特征及其构造和成矿意义

火山岩型铀矿床通常与酸性至中性的火山岩类有关 ,而 6 710铀矿区的铀矿化与双峰式火山岩和基底花岗岩有紧密的空间关系。研究表明该套双峰式火山岩中玄武岩的Rb Sr等时线年龄为173± 9 7Ma ,流纹岩为 16 4 8± 0 57Ma。前者的不相容元素地球化学特征与板内拉斑玄武岩相一致 ;后者为准铝质 (ACNK =0 88- 0 96 ) ,稀土元素 (ΣREE :(2 50 33- 2 95 99)× 10 - 6 )和高场强元素 (Y ,Zr,Nb等 )的含量较高 ,与A型花岗岩的地球化学特征相似。基底花岗岩的Rb Sr等时线年龄为 2 4 9 9± 5 5Ma ,岩石为过铝质 (ANKC =1 18- 1 2 6 ) ,富集LREE((La/Lu) N=2 8 51-55 0 9)和大离子亲石元素 (Rb ,Th ,U等 ) ,与同造山S型花岗岩的地球化学特征一致。双峰式火山岩表明该区在燕山早期具有拉张裂解的地球动力学背景 ,基底花岗岩代表了海西晚期的挤压造山环境。它们分别为本区铀成矿提供了矿化剂 (CO2 - 3)和铀源。     

东营凹陷中生代火山岩地球化学初步研究

东营凹陷早白垩纪火山岩,沿青城断裂分布,是一套弱碱性-钙碱性、富钠的大陆玄武岩、玄武安山岩.其84Sr/86Sr=0.705197,K-Ar同位素年龄为116.8±2.4～121.6±2.5Ma,稀土含量在84.93×10-6～90.60×10-6,∑LREE/∑HREE=6.99～7.24.岩浆主要来自上地幔,并受地壳物质混染.研究表明,该套火山岩产出的大地构造背景是活动大陆边缘火山弧后,左旋压扭应力场中的Nww向展布的次级张性盆地.     

桶形基础采油平台三维有限元稳定性计算分析

采用三维有限元计算方法对CB20B桶形基础海上采油平台进行了稳定性计算分析。平台工作期间在外部荷载如风力、波浪、冰力、海流等作用下,其抗倾、抗滑稳定性不仅与平台的整体结构有关,而且和海底土体的力学特性以及结构与土体的相互作用密切相关。分析结果表明CB20B桶形基础平台在设计条件下运行是较为稳定的。     

我国土地城镇化的时空特征及机理研究

为了探索我国土地城镇化规律,基于2000—2012年省级数据,运用统计分析法研究了我国土地城镇化的时空特征及机理。研究表明,全国和各个省份的城镇建成区与土地城镇化水平均有大幅增长,但省际差异较大,空间格局上呈现出显著的峰值效应;土地城镇化快于人口城镇化,且省际差异明显;相对于土地城镇化水平空间格局而言,省级城市建成区规模空间格局与GDP的空间格局更为相似;经济增长、土地财政、用地指标、土地资源禀赋及现行土地征收制度是造成这种变化的主要影响因素。     

Effects of rice straw on the cell viability,photosynthesis, and growth of Microcystis aeruginosa

Rice straw is supposed to be an environment-friendly biomaterial for inhibiting the growth of harmful blooms of the cyanobacterium Microcystis aeruginosa. However, its potential mechanism is not well known. To explore this mechanism, the growth, cell viability （esterase activity, membrane potential, and membrane integrity）, photosynthesis, and cell size ofM. aeruginosa were determined using flow cytometry and Phyto-PAM after exposure to rice straw extracts （RSE）. The results show that doses from 2.0 to 10.0 g/L of RSE efficiently inhibited the alga for 15 days, while the physiologic and morphologic responses of the cyanobacteria were time-dependent. RSE interfered with the cell membrane potential, cell size, and in vivo chlorophyll-a fluorescence on the first day. After 7 days of exposure, RSE was transported into the cytosol, which disrupted enzyme activity and photosynthesis. The cyanobacteria then started to repair its physiology （enzyme activity, photosynthesis） and remained viable, suggesting that rice straw act as an algistatic agent.     

Secondary metabolites of a deep sea derived fungus Aspergillus versicolor CXCTD-06-6a and their bioactivity

In order to obtain novel secondary metabolites, a deep sea inhabiting fungus Aspergillus versicolor CXCTD-06-6a was investigated. One new diketopiperazine brevianamide W(1a), as well as five known diketopiperazine alkaloids, diketopiperazine V(1b), brevianamide Q(2), brevianamide R(3), brevianamide K(4), and brevianamide E(5), were isolated from the Et OAc extract of the fermentation broth. Their structures were elucidated by spectroscopy techniques(NMR, MS). The six compounds exhibited moderate radical scavenging activity against DPPH with clearance ratio of 55.0%(1a and 1b), 53.7%(2), 46.2%(3), 61.4%(4) and 19.3%(5) at a concentration of 13.9 μmol L-1, respectively; while the positive control ascorbic acid showed a ratio of 70.3% at the concentration of 28.4 μmol L-1.