带地形的MT多参量二维快速模拟退火约束反演

在井资料、地震资料等先验知识的约束下，采用非常快速的模拟退火算法对起伏地形的连续电磁阵列剖面(CEMP)资料进行非线性约束反演。理论模型试算表明了方法的正确性及有效性。CEMP268测线实际资料的反演补充了钻井、地震资料的不足，提供了该区重要的生、储层——中生界的厚度及分布，为地质人员提供了重要的基础性数据。     

MT-2000型短波发射机的构造分析及维护方法

针对MT-2000型短波发射机的构造分析及维护方法进行分析,首先介绍了MT-2000型短波发射机的构造,其内容主要有:宽频带激励器,前级及驱动放大器模块,静默版等等.结合这些内容,研究并阐述了MT-2000型短波发射机日常使用过程中经常出现的故障和问题,并针对这些问题,总结相应的维护方法,主要包括:谐波滤波器的技术维护方法,功放单元的技术维护方法,天线的技术维护方法等等.     

物探方法在喀拉扎地区铀矿勘查中的应用

文章简述了喀拉扎地区地质概况、成矿岩性特征及成矿岩层物性参数特征。根据喀拉扎地区地质特点、成矿类型、含矿岩体地层与背景地层物性参数上存在较大差异性,及钙质砾岩与铀矿化正相关性,选取可控源音频大地电磁测量、地面伽玛能谱测量、伽玛总量路线调查及综合测井的勘探方法,并分别说明单一方法在喀拉扎地区的找矿应用及效果,最后综合分析了方法组合在该地区找矿中的应用效果,认为白垩系下统清水河组(K_1q)为该区的铀成矿有利地层,钙质砾岩为主要含矿岩体。     

矿用钢丝绳检验智能管理系统研究

矿用钢丝绳是涉及煤矿提升运输安全的重要部件 ,通过分析国内矿用钢丝绳检验过程 ,根据煤炭行业标准 ,研制了基于VB的“矿用钢丝绳检验智能管理系统” ,并对开发本系统的必要性、主要功能以及数据库结构进行了阐述     

Stress transfer from rocking shallow foundations on soil-cement reinforced clay

Equivalent-static pushover analyses with a three-dimensional (3D), nonlinear, finite-difference model are used to investigate the static and seismic stresses imposed on soil-cement grid reinforcements in soft clay profiles by overlying structures supported by shallow footings. The goal is to evaluate the potential stress concentrations in the soil-cement grid during foundation rocking and the potential for large foundation settlements associated with the local crushing of the soil-cement. The numerical analyses are first validated using data from dynamic centrifuge experiments that included cases with and without large foundation settlements and localized crushing of the soil-cement grids. The experimental and numerical results indicate that the stresses imposed on the soil-cement grid by the overlying structures must account for foundation rocking during strong shaking and stress concentrations at the soil-cement grid intersections. The numerical analyses provide reasonable predictions of the structural rocking loads and the zone of the expected crushing or lack of crushing, but underestimate the accumulation of foundation settlements when the seismic demands repeatedly exceed the soil-cement strength. The simulated moment-rotation and uplift behavior of the footings under monotonic lateral loading are reasonably consistent with the dynamic centrifuge test results. Parametric analyses using the validated numerical model illustrate how the stress transfer varies with the area replacement ratio, the thickness of the top sand layer, the properties of the bearing sand layer, and the relative stiffness of the soil-cement and the surrounding soil. A design model for estimating the stresses imposed on a soil-cement grid by rocking foundations was developed and shown to provide a reasonable basis for assessing whether or not local damage to the soil-cement grid is expected.     

航空和地面综合地球物理方法开展干热岩探测研究

通过讨论干热岩对其附近岩层磁性和电性的影响,结合磁法和大地电磁法勘查的发展现状,提出了利用航空和地面综合地球物理方法开展干热岩勘探的思路设想,即利用航磁测量、航空天然场电磁测量(ZTEM)及大地电磁测量(MT)综合方法互相配合、优势互补,利用磁化强度矢量反演得到地下三维磁化率分布特征模型,利用印模法将ZTEM与MT数据有机结合起来,得到较大面积的地下三维视电阻率特征模型,磁电综合分析,实现快速勘探干热岩,加快我国开发和利用新型清洁能源——地热能的步伐。     

机器翻译探讨与研究

从多个角度论述了机器翻译常用的方法,并通过一些实例的分析对现有机器翻译系统进行了分析研究;最后得出结论并对机器翻译的未来进行展望。     

Bioaccumulation of silver in ectomycorrhizal and saprobic macrofungi from pristine and polluted areas

Macrofungi are effective accumulators of Ag. This study provides a comprehensive review of this phenomenon supported by original data on the Ag concentrations of macrofungi from pristine and Ag-polluted areas. In pristine areas, the median Ag concentrations of ectomycorrhizal (ECM) and saprobic (SAP) macrofungi were 0.79 and 2.94 mg kg^− 1, respectively. In these areas, hyperaccumulation thresholds for Ag in ECM and SAP macrofungi are proposed as 100 and 300 mg kg^− 1, respectively. In a Ag-polluted area, the Ag concentrations in macrofungi (ECM and SAP) were significantly elevated with the median value of 24.7 mg kg^− 1 and the highest concentrations in Amanita spp. of the section Vaginatae (304-692 mg kg^− 1). The intracellular speciation of Ag in fruit-bodies of the Ag-accumulator Amanita submembranacea was inspected by size exclusion chromatography followed by sulfhydryl-specific fluorimetric assays of ligands using reverse phase high-performance liquid chromatography and improved polyacrylamide gel electrophoresis. Virtually all Ag was found to be intracellular and sequestered in the major 7 kDa and minor 3.3 kDa complexes. The lack of glutathione and phytochelatins and the presence of a single 3 kDa sulfhydryl-containing peptide in the isolated Ag-complexes suggest that detoxification of Ag in A. submembranacea may rely on metallothionein. Vertical distribution of Ag in a polluted forest soil profile has shown substantial enrichment in organic horizons; in polluted technosol, the highest Ag concentrations were found in surface layers. Standardized EDTA extraction of Ag in both the investigated soil profiles showed relatively low Ag extractibility, generally within the range of 2.2-7.7% of total Ag content.     

基于隐藏变量区别模型的中文多词表达抽取

Discriminative Latent Model (DLM) is proposed for Multiword Expressions (MWEs) extraction in Chinese text to improve the performance of Machine Translation (MT) system such as Template Based MT (TBMT). For MT systems to become of further practical use, they need to be enhanced with MWEs processing capability. As our study towards this goal, we propose DLM, which is developed for sequence labeling task including hidden structures, to extract MWEs for MT systems. DLM combines the advantages of existing discriminative models, which can learn hidden structures in sequence labeling task. In our evaluations, DLM achieves precisions ranging up to 90.73% for some type of MWEs, which is higher than state-of-the-art discriminative models. Such results demonstrate that it is feasible to automatically identify many Chinese MWEs using our DLM tool. With MWEs processing model, BLEU score of MT system has also been increased by up to 0.3 in close test.     

TaqMan探针荧光定量PCR检测花生油中掺入棕榈油的研究

根据棕榈内源基因MT3 -B设计引物和TaqMan探针,采用基因重组技术构建用于检测棕榈基因MT3 -B的重组质粒作为绝对定量标准品,建立标准曲线,对花生油中掺入棕榈油1% ～40%梯度混合油品提取DNA进行棕榈成分定量检测.结果表明,重组质粒标准品荧光定量标准曲线对数线性回归分析相关系数(R2)为0.996;花生油中掺入棕榈油达到5%时,可检出每亳升混合油品中棕榈MT3 -B基因17.431 copies,检测的重复性和特异性好.