三氯生对小球藻的生长效应研究

研究三氯生(Triclosan) 对小球藻(Chlorella spp) 生长状况、藻细胞光合色素及碳水化合物含量的影响,检测三氯生对小球藻的毒性效应.采用概率单位-浓度对数法进行数据处理.结果表明:藻细胞密度随药剂浓度增加而明显下降,且呈现较好的剂量-效应关系;96 h 半抑制效应浓度 ( EC50 ) 为 0.065 0 mg·L-1,属于高毒;三氯生明显抑制小球藻光合色素含量的增加,并对碳水化合物含量变化有持续的影响.     

利用有限体积模型对狭长海湾填海优选方案的研究

人们在海湾中进行填海活动除了要考虑经济收益等正面效应外,还应顾及海洋环境的改变对人类可持续发展的影响.文中利用三维动边界水动力模型FVCOM(Finite-Volume Coastal Ocean Model,有限体积近岸海洋模型)对具有曲折岸线和复杂海底地形的狭长海湾-福建省沙埕港进行了现状水动力模拟和4种填海方案下的预测模拟.在此基础上研究了在各种填海方案下,沙埕港的纳潮量、潮流场、潮位以及水交换率的变化情况,讨论了各海洋要素的变化对港口、航道、红树林自然保护区的影响.最后比较了各填海方案下水文要素的变化情况,发现针对不同的海洋要素,填海方案的优先顺序不同.为了减少填海活动所带来的危害,照顾到各方面的利益,提高填海活动的益损比,需要根据海洋功能区划和当地具体情况,综合考虑多种水动力因子变化的影响.     

2019年四川长宁MS6.0地震前破裂区内视应力和b值的变化

视应力和b值都可以反映地壳应力变化。当应力增加时,视应力会增加,而b值降低。因此,应力变化将导致视应力和b值之间呈负相关关系,即,根据视应力和b值之间的负相关关系可以研究地壳构造应力的变化。本文利用2000年1月—2019年12月长宁M_S6.0地震破裂区内3.0≤M_L≤3.6地震的视应力和2.0≤M_L≤4.3地震目录,研究了视应力和b值随时间的变化,发现:2013年2月—2017年3月间,视应力呈趋势上升变化,历时约4年,在震前两年时间内,视应力仍维持在较高水平。在视应力呈趋势上升变化期间,b值则呈趋势下降变化。当视应力维持在较高水平时,b值则维持在较低水平。即,长宁M_S6.0地震发生前,破裂区内视应力增加,同时b值下降。这表明,2019年长宁M_S6.0地震发生前破裂区内存在明显的构造应力增加过程,对地震孕育过程的认识和地震预测研究都具有启示意义。      

蒙古国查干苏布尔加大型铜-钼矿床地质特征及成因

查干苏布尔加斑岩铜钼矿床位于西伯利亚板块南缘近东西向和北东向深大断裂所夹持的南蒙古构造岩浆带内,容矿围岩二长花岗斑岩与花岗闪长斑岩主量元素高SiO2(64.69×10-2~73.42×10-2),高Al2O3(15.33×10-2~18.35×10-2),贫MgO(0.13×10-2~0.56×10-2),微量元素Sr二长花岗斑岩略低(144×10-6~175×10-6).花岗闪长斑岩表现为高Sr(样品>300×10-6,476×10-6~720×10-6),二者均低Y(Y<18×10-6,2.21×10-6~10.20×10-6),低Yb(Yb<1.9×10-6,0.30×10-6~1.48×10-6),高Sr/Y(Sr/Y>20,21.8~63.52),稀土元素特征为亏损重稀土,无明显负铕异常,(87Sr/86Sr)i=0.70154~0.70397,(143Nd/144Nd)i=0.512290~0.512600,εNd(t)为+2.4~+8.5,二长花岗斑岩和花岗闪长斑岩均具有埃达克质岩特征,但二长花岗斑岩与花岗闪长斑岩主、微量和稀土元素又存在一定差别,它们可能是岩浆不同演化阶段的产物.通过年龄测定,获得辉钼矿Re-Os等时线年龄为(370.0±5.9)Ma,二长花岗斑岩锆石SHRIMP U-Pb加权平均年龄为(365.7±3.6)Ma,铜钼矿形成时代与二长花岗斑岩形成时代相近,均形成于晚泥盆世.铜钼矿床与二长花岗斑岩、花岗闪长斑岩紧密共生,矿区范围内二长花岗斑岩与花岗闪长斑岩多被蚀变并矿化,表明二长花岗斑岩、花岗闪长斑岩与铜钼矿化存在密切的时空关系,为铜钼成矿提供了主要成矿物质和流体来源.     

Platinum-Group Element Geochemical Certified Reference Materials (GPt1-7)

Unlike the situation for other elements, few reference materials certified for the platinum-group elements are currently available. Therefore, the GPt1-7 series of PGE geochemical CRMs, prepared by the IGGE, represent an important addition and comprise a range of matrix types, including a soil, stream sediment, Mg-rich ultramafic rock, Fe-rich ultramafic rock, platinoid ore depleted in Cu, Ni and Fe, and a chromitite. The concentration of PGE in these samples ranges over 4-5 orders of magnitude and the samples were shown to have good homogeneity as assessed by a variance test. Analytical methods based on different principles were used in sample certification, including several fire assay and wet chemical procedures used for decomposition and preconcentration. Certified values for the elements Pt, Pd, Os, Ru, Ir, Rh and Au were determined by AAS, catalytic colourimetry (COL), catalytic polarography (POL), atomic emission spectrometry (AES), ICP-MS and NAA. Recently, the GPt1-7 samples were approved as national primary CRMs by the State Bureau of Technical Supervision of China.     

赣北中元古界双桥山群低变质强变形行为与格林威尔期造山作用

广泛分布于赣北地区的中元古界双桥山群，以低级区域变质作用、强烈构造变形、具陆内造山带构造变形特征；其成果系在华夏古陆与扬子古陆的碰撞拼接过程中，其应力向陆内传递的结果；时间大致在1100－800Ma，与全球格林威尔期造山作用相当。     

黑龙江省“九五”与“十五”测震台网理论最小监测能力的对比

对黑龙江省地震局“九五”和“十五”地震台网的理论最小监测能力进行计算和对比,为地震台网的布局提出了一些合理化的建议,为以后的地震台网建设提供了很好的参考。     

卫星激光测距的电控系统设计与实现

给出的卫星激光测距的二轴系统实现了通过软件控制望远镜coude光路调整、接收系统SPAD和APD的自动切换、视场光阑大小的自动调节、以及发射光束指向的精确控制。该系统是基于MPC07运动控制卡,通过人机交互界面进行实时控制,旨在实现不同功能的调节,提高卫星激光测距的自动化程度。详细介绍了该系统的硬件组成、技术指标及软件工作方式。     

莱芜市莱城区张家洼畜禽养殖用地探讨

近年来,莱芜市莱城区张家洼规模化畜禽养殖发展迅速,促进了当地的经济发展,但畜禽养殖用地的规划还处于无序状态,畜禽养殖破坏了环境,影响了村容村貌。为此,莱城区加强畜禽养殖用地管理,加强规划控制,加强畜禽养殖用地规模的核查;推行畜禽养殖用房流转,收取复耕保证金,走大棚养殖特色之路,取得了明显成效。     

Biodegradation of <Emphasis Type="Italic">Enteromorpha</Emphasis> polysaccharides by intestinal micro-community from <Emphasis Type="Italic">Siganus oramin</Emphasis>

Micro-communities are supposed to have more potential functions of biodegradation of polysaccharides than single strain; however, the intestinal micro-communities involved in the biodegradation of Enteromorpha polysaccharides (EP) were seldom reported. In order to obtain the EP-degrading micro-community, the intestines of Siganus oramin was obtained to isolate the micro-communities, which were enriched by 0.3% of EP as the sole carbon source. A stable micro-community with EP degradative capability was achieved after seven generations of subculture, named H1. Results showed that H1 was able to degrade 75% of EP within 24 hours, and the activity of EP lyases reached 500 U mL^?1 in 32 hours. With denaturing gradient gel electrophoresis (DGGE) and 16S rRNA gene clone library analysis, ten bacteria closely related to Marinomonas pontica, Microbacterium sp., Leucobacter chironomi, Cyclobacterium sp., Algoriphagus winogradskyi, Pseudoalteromonas sp. and Vibrio sp. were determined. Furthermore, compared with the DGGE bands sequence and the clone library analysis, the dominant bacteria of the EP-biodegrading micro- community were Pseudoalteromonas sp. and Vibrio sp., with the respective proportion of 38% and 46%, and they should play an important role in EP degradation together with other degrading bacteria in the micro-community H1.