关于MT818-2009标准中移动类软电缆的三个问题

对MT 818-2009《煤矿用电缆》标准中,移动类软电缆的外径、绝缘厚度和导体直流电阻等内容提出几点看法.     

单片机与DTMF信号收发芯片MT8880的直接接口设计

介绍了单片机与双音多频（ＤＴＭＦ）信号收发芯片ＭＴ８８８０的直接接口设计方法。其特点是利用单片机的Ｉ／Ｏ口模拟产生ＭＴ８８８０的接口信号时序，得到无其它外围芯片的直接接口。文章以单片机８９Ｃ２０５１为实例，给出了ＭＴ８８８０与其连接时的硬件和软件设计。本方法已在电话终端产品中获得应用。     

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.     

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.     

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.     

蓝牙基带控制器芯片MT1020A及其应用

蓝牙技术是用微波无线通信技术取代数据电缆来完成点对点对多眯短距离通信的一种新型无线通信技术。而蓝牙芯片则是蓝牙技术的基础和关键。文章介绍了MITEL公司新推出的蓝牙基带控制器芯片MT1020A的主要特点、内部结构和引脚功能。给出了用MT1020A和其它无线通信器件组成无线通信系统的应用设想。     

医学断层图像三维重建的辅助轮廓线法

在原有的轮廓线基础上生成与之相似的辅助轮廓线．然后把各轮廓线三角化形成一层层的三角面片,最后按一定的规则把各层三角面片从外到内直接连接形成四面体,从而完成三维重构．文中算法尤其适合基于断层轮廓线的医学图象三维重构,与已有的三维重构法（如MC．MT,Delaunay四面体化）相比,具有算法简单、思路自然、易于实现的特点．     

基于分形插值的大地电磁静校正方法

鉴于协同克里格插值方法存在光滑效应的缺点,在前人工作的基础上,提出了基于分形插值技术的大地电磁静校正方法。该方法将分形技术与协同克里格法相结合,利用在二维构造情况下,静态效应使视电阻率曲线发生平移,对相位曲线无影响的特点,通过分析实测视电阻率和相位的空间分布特征及相关性,引入分形插值技术对受静态效应影响测点上的视电阻率对数进行插值计算,进而求取静态偏移因子。最后利用该方法进行了理论模型和实测数据试验,结果表明了该方法的正确性及有效性。     

由MT资料反演真谱参数的基本原理

常规的大地电磁测深反演方法没有考虑岩矿石激电效应。基于岩矿石激电响应的Dias新模型,分别计算了3层模型的中间层在有极化与无极化2种情况下的视电阻率和相位曲线。结果表明,2种情况下的视电阻率和相位曲线在高频段和低频段基本上重叠,而在中频段有明显的差异。进而研究了从大地电磁测深复视电阻率资料反演地层的真谱参数的方法,推导了层状模型反演的基本公式并给出了相应的具体反演算法。该算法能从MT资料中提取激电谱参数,为解释提供更多的依据。     

实用主存数据库实现及其在短消息中心的应用

介绍了主存数据库的基本概念和其与传统数据库的差异,以及探讨了关系型主存数据库的设计思想与实现方法,并介绍已成功应用于短消息中心的一个关系型主存数据库原型系统ExceedSQL。