pH值、碱类型及预停留时间对铁砷共沉淀物长期稳定性的影响

Fe(Ⅲ)-As(Ⅴ)共沉淀法作为一种经济的除砷方法,被广泛应用于处理有色冶金含砷废水。为防止处理后的含砷废渣二次污染,必须进一步研究其稳定性。本文通过室内模拟实验,研究了不同pH值、碱类型及在pH4条件下的预停留时间等对铁砷共沉淀物稳定性的影响。结果表明,在pH4条件下,共沉淀物稳定性最好;在pH4条件下延长预停留时间能增强砷的稳定程度;使用石灰或添加Ca2+明显增加了共沉淀物中砷的稳定性。

Preparation and luminescent properties of rare earth ions in M2B5O9Cl : Re(M = Ca, Sr, Ba; Re=Eu, Tb)

M2B5O9X: Re(M = Ca, Sr, Ba; X = Cl, Br; Re = Eu, Th) phosphors were synthesized via solid state method. The products were characterized with X-ray powder diffraction and luminescence spectrometer. The luminescent properties as well. as the influences of the matrix composition and other doping ions on the luminescence of the rare earth ions of the co-doped phosphors were investigated. The coexistence of Eu3+, Eu2+ and Th3+ were observed in these matrices. The phenomenon may be explained by the electron transfer theory. The sensitization of Ce3+ ion improves the intensity of emission of Eu2+, and Tb3+. The competition between electron transfer among conjugate rare earth ions and energy migration might be the reasons for the observation. We predict a novel trichromatic phosphor co-doped with Eu3+ Tb3+ in M2B5O9X.

An infrared study on Langmuir-Blodgett films of octadecylammonium octadecanoate: FWHM and the vibrational coupling

The monolayer of the mixture of octadecanoic acid and octadecylamine with molar ratio 1: 1 has been investigated at the air-water interface. It was found that the monolayer shows a rather stable state at the surface pressure of 30 mN/m and this monolayer can be transferred onto a CaF2 plate by Langmuir-Blodgett (LB) technique. The infrared spectra of LB films indicated that octadecyl ammonium octadecanoate is formed by an intermolecular proton exchange between adjacent carboxylic and aminic groups (COO- and NH3+). In three-layer LB film, the CH2 scissoring mode of the long hydrocarbon chains of octadecyl ammonium octadecanoate shows a broad band feature at about 1468 cm(-1) while this vibrational mode of three-layer LB film of the mixture (1: 1) of deuterated stearic acid and octadecylamine (octadecylammonium octadecanoate-d35, C18H37NH3+C17D35COO-) only shows a narrow band. The broad feature of the CH2 scissoring mode in octadecylammonium octadecanoate probably originates from the coupling between the chain of stearic acid and that of octadecylamine while this kind of coupling could be completely removed in octadecylammonium octadecanoate-d35.

流动注射石英管原子吸收法测定微量总汞

建立了一套流动注射石英管原子吸收光谱法测定土壤、植物和药品等样品中微量Hg的方法,研究了酸度、载液和还原液流速及其浓度、氩气流量等条件对测定结果的影响.采用五氧化二钒、硝酸、硫酸进行消解,可获得可靠的分析结果.方法特征量为59 pg,检出限为0.028 μg/L;相对标准偏差为1.60%～3.86%;回收率为94%～102%.

Determination of mercury with a flow injection quartz tube atomic absorption spectrometry

A method was developed for the determination of micro mercury in the soil, plants and the traditional Chinese medicine using flow injection quartz tube-atomic absorption spectrometry. The effect of the factors such as acidity,. the carrier solution, the flow rate of reductive solution and argon gas, etc. on the determination was studied. When vanadic oxide, nitric acid and sulfuric acid were used to decompose the sample reliable result could be obtained. The characteristic mass of the method is 59 pg, the detection limit is 0.028 mug/L, RSD is < 3.9% and the recovery is in the range of 94% &SIM; 102%.

胸苷酸合成酶和二氢叶酸还原酶mRNA亲和肽的发现及mRNA体外展示技术的优化

胸苷酸合成酶（thymidylate synthase，简称TS）和二氢叶酸还原酶（dihydrofolate reductase, 简称DHFR）都是叶酸依赖性酶，在维持DNA合成和DNA修复上发挥关键作用，并且多年来一直是肿瘤研究和化疗的重要靶点。我们前期的研究发现，TS和DHFR在翻译水平上存在负反馈调控机制。人TS和DHFR可以与其自身的mRNA结合，从而抑制mRNA的表达，化疗药物可以与TS或者DHFR相互作用，形成的复合物不能与TS mRNA结合， 使负反馈机制丧失。因此深入研究TS和DHFR的翻译调控机理，对阐明肿瘤抗药性机制，对发现新的抗肿瘤药物和肿瘤的治疗都具有十分重要的意义。 本论文利用mRNA体外展示技术，构建多肽库（约10万亿种多肽分子），利用多种实验手段将mRNA体外展示技术进行优化，提高了多肽库融合肽的产量，提高了mRNA体外展示技术筛选的特异性。将TS mRNA分子上的顺式因子TS30 RNA固定于磁珠上，将融合肽库与顺式因子作用，经过6轮循环，由多肽库中获得了与TS mRNA高度亲和的多肽序列，体外结合实验证明亲和肽可以与TS全长mRNA结合，体外翻译实验证明多肽可以抑制TS mRNA的翻译。并且利用phage display技术由噬菌体肽库（12个氨基酸随机肽库）经过四轮筛选，分别筛选到TS和DHFR的亲和肽，凝胶阻滞实验证明它们分别能与TS和DHFR mRNA结合。 本论文利用的展示技术可以广泛应用于特异靶点的蛋白质筛选，并且本论文筛选到的TS和DHFR亲和肽可以作为TS和DHFR的抑制剂，从而为获得新型的抗肿瘤药物奠定基础。

典型海域底床稳定性研究

随着对海洋资源的开发，大量的海底工程设施应运而生，而对其依托的海底底床稳定性的研究就成为海洋地质和海洋工程学者当务之急的工作重点之一。不同的地质单元受控的海洋环境差异很大，海底底床的稳定性也表现出不同的特点，为此，针对不同的地质单元就需要选用不同的分析方法。本文选取以海底沙坝与海槽为主要地貌单元的青岛市汇泉湾海水浴场，以及沙脊和沙波广泛发育的南海北部湾西南海域浅海陆架两个典型海域作为研究区域。对于潮流和波浪碎裂流控制的海水浴场，通过采集表层样，借助流速仪、全站仪、激光粒度仪、DGPS定位，利用粒径趋势分析模型GSTA(Gao S，1996)，结合地形测量数据和潮流数据，分析了海水浴场的表层沉积物粒度特征、沉积物类型、冲淤变化及输运方向；而对波浪潮流联合作用的北部湾西南浅海陆架采用多波束测深系统、DGPS定位等仪器测量手段，利用图像对比方法结合泥沙输运模型SEDTRANS（Michael Li， 2001），分析浅海陆架海底底床的地貌特点、地质单元类型、沙波底床的输运速率和方向、冲淤变化及底床稳定性对海底管线安全的影响。 采集并分析了青岛市汇泉湾海水浴场149个表层样品的粒度参数特征，结合沉积物输运趋势分析模型结果和水动力观测资料得出高潮线到沙坝沉积物输运方向为SE向，沙坝向海一翼沉积物输运方向为NW向；地形测量数据显示侵蚀区域主要分布在3月份沙坝脊线附近，而3月份槽线附近为主要的堆积区。 对比分析北部湾西南部海区2004～2006连续3年的多波束海底地貌扫描数据，得出研究区域海底沙波的波长为5.8～91.8m，波高0.1～4.3m，陡峭度0.013～0.12，对称指数0.32～6.52。沙波的移动速率最大达48.8m/a，移动方向在研究区域西部为SE向，中部呈往复迁移，东部为NW向；沙波不同部位的迁移速率不同，一般的沙波尾翼迁移速率较大；同一组沙波存在反向扭转迁移的现象，反向扭转迁移的轴线位于研究区域沙脊的脊线附近，这种反向迁移不仅与底层流作用有关，还与海底地形关系密切；04～06年西部海底底床处于侵蚀状态，局部的最大侵蚀量可达1.3m，东部处于堆积状态，最大堆积量达2.8m。 对于发育沙坝-海槽型潮上带和潮间带，粒径趋势分析模型结合地形测量以及水动力测量，分析底床冲淤变化及泥沙搬运方向，具有省时省力高效的优点，同时很好的弥补了粒径趋势分析模型对冲淤量的预测无能为力这一缺陷；对于沙脊沙波广泛发育的浅海陆架，通过对比多年的沙波地貌图计算沙波的迁移速率和方向，避开了通过潮流场模型预测沙波活动，因考虑底床稳定性的控制因素不足而带来的误差，为评价沙脊沙波型底床的稳定性提供新的可行性研究方法。

The behaviors and sources of dissolved arsenic and antimony in Bohai Bay

In this paper, we determined the concentrations of antimony species (antimonite (Sb(III)), antimonate (Sb(V)) and dissolved inorganic antimony (DISb)) and arsenic, in Bohai Bay seawaters, as well as the relationships of the analytes with environmental factors such as seawater characteristics (e.g., suspended particulate material (SPM), salinity and total organic carbon (TOC)), heavy metals, nutrients and phytoplankton species, and evaluated the sources of arsenic and antimony. Dissolved arsenic and antimony concentrations in the surface waters were ranging spatially from 1.03 to 1.26 ng/ml and 0.386 to 1.075 ng/ml, with mean values of 1.18 and 0.562 ng/ml, respectively. Sb(V) as the prominent chemical species constituted about 89%. Regarding arsenic concentrations in the surface waters, there was a tendency for a small variation. However, antimony species concentrations were much variable than arsenic. The highest arsenic and antimony concentrations were found near the Haihe Estuary. These distribution patterns were controlled mainly by environmental factors, biological activities and sources. In this region, DISb and Sb(V) negatively correlated with salinity. Besides, arsenic and antimony correlated well with the nutrients, chlorophyll a and phytoplankton, implying that arsenic and antimony had been involved in biological cycling. In addition, according to our estimate, about 333.5 x 10(8) mg/year of arsenic and 454.2 x 10(8) mg/year of antimony reached Bohai Bay via rivers. (C) 2010 Elsevier Ltd. All rights reserved.

獐牙菜植物的引种栽培方法

本发明涉及獐牙菜植物的引种栽培技术，该技术包括种子处理和引种栽培等技术。本发明通过对獐牙菜种子进行物理和化学方法处理，使其种子萌发率达75％以上；通过地膜覆盖技术，即在种子播种前采用地膜覆盖7-28天，可有效地控制杂草数量和生长，为规模化种植奠定可靠的基础；通过在海拔1500—4500米的原产水浇大田或适宜旱耕地的引种栽培途径， 可快速恢复獐牙菜的资源量，并有效地保证獐牙菜的药材品质和药效成分。

北京地区Pc6脉动统计特征及其与TID关系研究

Through the statistical analysis of the geomagnetic data from BMT in 2005, we get the period and frequency characteristic of Pc6 micropulsation in Beijing area. Pc6 micropulsation is a frequently occurred phenomenon in geomagnetism but we still do not have adequate knowledge to it. In this paper, we found that the periods of Pc 6 micropulsation focus on 10 to 30 minutes. They do not have distinct seasonal variation but obtain a little lower occurrence in the winter than other seasons. Then we analysis the geomagnetic data of BMT from 1998 to 2006, which is a solar activity cycle and get some results about the relationship between Pc6 micropulsation and solar activities. In this way, we discuss more about the origin and evolvement mechanism of the Pc6 micropulsation. When the solar is more active than usual years, there are more occurrences of Pc6 micropulsaton observed. The occurrence of Pc6 micropulsation is associated with geomagnetic index. With the increase of AE and Kp index, there are more occurrences of Pc6 micropulsation. Furthermore, we make use of the Doppler data from Peking University in 2005 make a comparative research between TID events and Pc6 micropulsation. There are 42 events can satisfy our request during Dec.23, 2004 to Mar.11, 2006. After the data analysis, we can draw a fundamental conclusion that there are positive links between Pc6 micropulsation and TID event. Moreover, when TID and Pc6 micropulsation occur simultaneously, their occurrences have a positive relationship with AE and Kp index. So we suppose there might be the same source of Pc6 micropulsation and TID event. Finally, we make use of two meridian geomagnetic stations network which has a distance about 1700 km to investigate the transmission characteristic of Pc6 micropulsation when Pc6 micropulsation and TID happened together. We found at that time Pc6 micropulsation is a local phenomenon.

波前重建法射线追踪及走时表压缩

As a fast and effective method for approximate calculation of seismic numerical simulation, ray tracing method, which has important theory and practical application value, in terms of seismic theory and seismic simulation, inversion, migration, imaging, simplified from seismic theory according to geometric seismic, means that the main energy of seismic wave field propagates along ray paths in condition of high-frequency asymptotic approximation. Calculation of ray paths and traveltimes is one of key steps in seismic simulation, inversion, migration, and imaging. Integrated triangular grids layout on wavefront with wavefront reconstruction ray tracing method, the thesis puts forward wavefront reconstruction ray tracing method based on triangular grids layout on wavefront, achieves accurate and fast calculation of ray paths and traveltimes. This method has stable and reasonable ray distribution, and overcomes problems caused by shadows in conventional ray tracing methods. The application of triangular grids layout on wavefront, keeps all the triangular grids stable, and makes the division of grids and interpolation of a new ray convenient. This technology reduces grids and memory, and then improves calculation efficiency. It enhances calculation accuracy by accurate and effective description and division on wavefront. Ray tracing traveltime table, which shares the character of 2-D or 3-D scatter data, has great amount of data points in process of seismic simulation, inversion, migration, and imaging. Therefore the traveltime table file will be frequently read, and the calculation efficiency is very low. Due to these reasons, reasonable traveltime table compression will be very necessary. This thesis proposes surface fitting and scattered data compression with B-spline function method, applies to 2-D and 3-D traveltime table compression. In order to compress 2-D (3-D) traveltime table, first we need construct a smallest rectangular (cuboidal) region with regular grids to cover all the traveltime data points, through the coordinate range of them in 2-D surface (3-D space). Then the value of finite regular grids, which are stored in memory, can be calculated using least square method. The traveltime table can be decompressed when necessary, according to liner interpolation method of 2-D (3-D) B-spline function. In the above calculation, the coefficient matrix is stored using sparse method and the liner system equations are solved using LU decomposition based on the multi-frontal method according to the sparse character of the least square method matrix. This method is practiced successfully in several models, and the cubic B-spline function can be the best basal function for surface fitting. It make the construction surface smooth, has stable and effective compression with high approximate accuracy using regular grids. In this way, through constructing reasonable regular grids to insure the calculation efficiency and accuracy of compression and surface fitting, we achieved the aim of traveltime table compression. This greatly improves calculation efficiency in process of seismic simulation, inversion, migration, and imaging.

湖南香花岭锡多金属矿床C、O、Sr同位素地球化学

对湖南香花岭锡多金属矿床成矿早、晚两期方解石进行了系统的C、O、Sr同位素研究。结果表明，成矿早期方解石具有相对较低的δ^13 CPDB（-5．4‰～-1．4‰）、δ^18 OSMOW（＋6．1‰～＋13．9‰）和较高的^87Sr／^86Sr值（0．7101～0．7230）；而成矿晚期方解石则具有相对较高的δ^13 CPDB（＋0．2‰～＋0．6‰）、δ^18 OSMOW（＋19．4‰～＋21．5‰）和较低的^87Sr／^86Sr值（0．7101）。分析认为，成矿早期方解石为岩浆热液与海相碳酸盐岩相互作用的产物，成矿流体中的碳源于岩浆碳和海相碳酸盐岩；模拟计算结果显示，成矿早期方解石为成矿溶液发生0．05～0．1摩尔分数的CO2去气作用的产物。而成矿晚期方解石主要为矿区碳酸盐岩低温淋滤的产物，流体中的碳主要源于矿区碳酸盐岩围岩。成矿流体中的Sr源于矿区花岗岩和碳酸盐岩，从成矿早期到晚期，岩浆来源的Sr逐渐减少，而碳酸盐岩围岩提供的Sr比例不断增大。