Differential Pulse Polarographic Determination of the Oxime Carbamante Insecticide Alanycarb

As basis for the development of a sensitive analytical method for the determination of the insecticide alanycarb, a study of the differential pulse polarographic (DPP) reduction of alanycarb on a dropping mercury electrode (DME) was performed. The pesticide was found to give a single DP peak over the pH range 1.0 to 6.0 and the pH dependency of the peak potential showed a linear segment with a slope of 65.2 mV (at 20°C). For the analytical DPP method running at pH 6.0 (peak at –503.4 mV), the relationship between the peak current and alanycarb concentration was linear in the range of 1.10 to 9.76 μg mL^–1 with a detection limit of 0.33 μg mL^–1. The proposed method was applied for the determination of alanycarb in spiked dam water and orange juice samples. The recoveries calculated for both types of dam water and orange juice samples spiked with 12.0 μg mL^–1 alanycarb were 96.3 and 99.0% with relative standard deviations of 5.2 and 1.3%, respectively. The sufficiently good recoveries and low relative standard deviations for the data reflect the high accuracy and precision of the proposed differential pulse polarographic method. The effects of diverse metal ions and other commonly used pesticides on the determination of alanycarb were also investigated.     

利用均震法判别扩腰桩桩身的完整性

本文阐述了均震动测法检测扩腰桩的方法及原理 ,分析了扩腰模型及工程实例 ,总结了不同质量扩腰桩的波形特征 ,为判别扩腰桩桩身的完整性提供了新思路。     

黄县弧形断裂探测、活动性鉴定及其地震地质意义

本文通过地质雷达探测、工程探测、地震地质调查、断裂断错和上覆第四纪地层年代测试等,确定了黄县弧形断裂的空间分布、运动性质、活动时代、垂直位移和滑动速率,鉴定了断裂的活动性,取得了一些有价值的成果。这些成果已在胶东北部沿海地区工程项目场地地震安全性评价工作、山东内陆部分潜在震源区划分与调整、山东省地震重点监视防御区判定研究中得到应用。本文的研究思路和方法对其它活动断层探测和断裂活动性鉴定有借鉴意义。     

蒙宁交界区地震震源深度的对比分析

选取内蒙古地震台网记录的2009~2015年蒙宁交界区103次ML≥2.5地震波形资料,采用震源深度测定的单纯型法、Hyposat法、双差法、PTD法重新测定震源深度,并将所获得结果进行对比分析。用CAP矩张量反演法重新测定了阿拉善左旗5.8级和4.2级地震的震源深度。最终获得用PTD法和双差法所得的震源深度结果与蒙宁交界区的构造特征比较吻合,单纯型法、Hyposat法效果不佳。同时得到蒙宁交界地震构造区的平均震源深度为13.32±8km。     

Disproportionation of Fe<Superscript>2+</Superscript> in Al-free silicate perovskite in the laser heated diamond anvil cell as recorded by electron probe microanalysis of oxygen

Experimental evidence is reported for Fe²⁺ disproportionation in Al-free perovskite (Pv), when submitted to large temperature gradients (i.e., under off-equilibrium conditions) in a laser heated diamond anvil cell (LHDAC). To enable this effect, the experimental procedure was designed to produce large radial and axial temperature gradients. In the Pv and ferropericlase (Fp) assemblage synthesized after dissociation of natural olivine, the three chemical states of iron (i.e., Fe⁰, Fe²⁺ and Fe³⁺) could be evidenced by electron probe microanalysis (EPMA), through variations of oxygen contents attached to the Fe cations. Despite inherent difficulties for determination of O-contents and Fe³⁺/ΣFe ratios using EPMA, we recorded significant changes in iron oxidation state across the laser-heated strip. These changes are correlated with variations in composition for the major elements (Fe, Mg, and Si), which evidences that the Pv/Fp assemblage experienced large segregation under the strong temperature gradients. Grains of metallic iron were detected in parts of the laser-heated strip coexisting with a Pv phase with Fe/(Mg + Fe) = 6 at% and most of its iron as Fe³⁺. This Fe²⁺-disproportionation reaction involves insertion of Fe³⁺-defects in the Pv lattice. This Fe³⁺-bearing Pv phase is presumably unstable and decomposes into a mineral assemblage including magnesioferrite, which is detected at the border of the laser-heated strip.     

利用非组合精密单点定位技术确定斜向电离层总电子含量和站星差分码偏差

联合双频GPS数据,利用相位平滑伪距算法,可得到包含斜向电离层总电子含量（slant total electron content,sTEC）、测站和卫星差分码偏差（differential code bias,DCB）的电离层观测值（称之为＂平滑伪距电离层观测值＂）,常应用于与电离层有关的研究。然而,平滑伪距电离层观测值易受平滑弧段长度和与测站有关的误差影响。提出一种新算法：利用非组合精密单点定位技术（precise point positioning,PPP）计算电离层观测值（称之为＂PPP电离层观测值＂）,进而估计sTEC和站星DCB。基于短基线试验,先用一台接收机按上述两种方法估计sTEC,用于改正另一接收机观测值的电离层延迟以实施单频PPP,结果表明,利用PPP电离层观测值得到的sTEC精度较高,定位结果的可靠性较强。随后,选取全球分布的8个IGS（internationalGNSS service）连续跟踪站2009年1月内某四天的观测数据,利用上述两种电离层观测值计算所有卫星的DCB,并将计算结果与CODE发布的月平均值进行比较,其中,平滑伪距电离层观测值的卫星DCB估值与CODE（Centre for Orbit Deter mination in Europe）发布值的差别较大,部分卫星甚至可达0.2～0.3 ns,而PPP电离层观测值而言,绝大多数卫星对应的差异均在0.1 ns以内。     

中国西南区域雨季开始和结束日期划分标准的研究

为了更好地开展区域关键期气候监测业务,满足国家级气象服务的需求,本文从区域角度出发,利用1961～2011年西南地区92个气象观测站的逐日雨量资料和1981～2010年美国国家环境预报中心和国家大气研究中心(NCEP/NCAR)逐日的高低层大气环流再分析资料,研究了西南区域雨季开始和结束日期定义的标准问题。结果表明西南区域多年平均雨季开始日期在5月3候(27候),结束日期在10月3候(57候),季节转换期间高低层环流的突变特征进一步表明了该结论的合理性。并通过对多种雨季开始和结束日期判断标准的对比分析,最终提出了西南雨季开始和结束日期的划分标准。同时,对影响西南地区雨季开始和结束日期变化的机理也进行了初步的讨论。     

西藏塔惹增地区上白垩统竟柱山组的厘定及其意义

分布于塔惹增地区帕荣山一带的一套碎屑岩夹碳酸盐岩,对其时代归属缺乏可靠的古生物化石,一直颇有争议.前人根据岩性将其归为古近系日贡拉组,通过对此套地层详细的剖面研究表明其时代为上白垩统竟柱山组,其沉积环境为残留海相沉积,此套地层的时代厘定,为研究怒江洋在该地区的关闭提供了重要的基础地质资料.     

北羌塘半岛湖地区早白垩世白龙冰河组厘定及意义

在北羌塘半岛湖地区前人划分的晚侏罗世索瓦组二段地层中,采集到属于早白垩世时代的古生物化石(Classopollis sp.Dicheiropollis etruscus、Senegalosporites sp.Steevesipollenites sp.),依据化石鉴定结果及区域岩石地层对比,将半岛湖地区原索瓦组二段厘定为早白垩世白龙冰河组。该套地层的厘定,对北羌塘盆地早白垩世时期沉积环境、古地理重建具有十分重要的意义。     

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