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.     

松潘-邵阳大地电磁剖面深、浅部典型构造的解释

通过对松潘—邵阳大剖面大地电磁原始资料的采集、分析、MT二维反演成图,进而对大剖面MT反演图进行综合地质解释,解释成果客观的反映了剖面区带深,浅部构造的展布规律并取得了如下几个方面的认识:(1)确定了龙门山推覆构造主滑脱面为埋深为20km的壳内低阻层;(2)查清了华蓥山构造带深,浅部断裂展布特征;(3)系统揭示了剖面区带隐伏断裂的发育情况;(4)对剖面区带的断裂活动性进行了分级;(5)揭示了川东—鄂西—湘中地区深、浅部褶皱构造的展布。     

MT890高功率密度柴油机润滑油规范及油品性能剖析研究

文章介绍了德国MTU公司的MT890高功率密度柴油机系列以及配套用油规范,并对符合该规范的油品进行了性能剖析研究,结果表明：MT890高功率密度柴油机润滑油质量级别相当于API CF-4,油品性能剖析结果验证了这一结论。     

基于MT9172的数字工业对讲系统用户线路中继器设计

一种采用MT9172为ISDN接口芯片的数字工业对讲系统用户线路中继器的设计方案,可根据需求变化成1～4路中继接口,应用方式灵活.通过二次中继,用户话站与系统主机之间的最大通信距离可达12千米,满足远程用户话站接入的需求.     

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。     

蜕变测试研究进展及其在并行程序测试中的研究展望

在软件测试过程中,待测程序的预期输出是判断软件是否存在缺陷的重要因素.蜕变测试技术是利用被测软件的属性来检查程序输出,从而有效地解决程序预期输出难以构造的问题.近年来,蜕变测试在软件测试领域取得了蓬勃的发展,许多研究人员将蜕变测试技术进行优化,将其运用到各个领域,有效提高了软件质量.从原理、过程及其优化,应用领域3个方面,总结蜕变测试的研究工作,着重分析了近5年的研究进展,进一步展望了蜕变测试用于并行程序时,可能的研究主题.首先,介绍蜕变测试的基本概念和蜕变测试过程;接着,从蜕变关系、测试用例、测试执行过程以及蜕变测试工具4个角度,总结蜕变测试优化技术;然后,汇总了蜕变测试的应用领域;最后,基于已有研究成果,讨论蜕变测试在并行程序测试领域面临的问题,为蜕变技术在并行程序测试领域的研究提供可能的思路.     

面向汉英机器翻译的包装句蜕处理

文中针对一种特殊的语言现象(HNC称为包装句蜕)进行了分析,目的是为机器翻译提供一些理论支持。首先从目前机器翻译系统所暴露的问题中提出研究包装句蜕的必要性,然后是对包装句蜕进行语言学描述及汉英对比分析,从可计算的角度提出了包装句蜕的判别方法,最后是包装句蜕的机器处理策略及规则。     

自相似网络环境中TCP-Friendly协议的研究

该文针对自相似的网络条件提出了一种单播的TCP Friendly拥塞控制算法 ,称为RAAR MT .该算法通过在线预测未来流量水平的变化趋势 ,并利用预测结果在接收端对业务流进行多时间尺度的速率控制 .仿真结果表明 ,在自相似的网络条件下该算法能够有效降低业务流的丢失率 ,即使在传统短相关环境中 ,其性能也不会出现严重衰减 .通过与TFRC协议进行对比研究发现 ,RAAR MT协议在对TCP的友好性、协议内的公平性以及速率的平滑性等主要的TCP Friendly协议指标都具有更好的性能 .由于RAAR MT不需要进行每包反馈 ,且主要功能在接收方实现 ,因此可方便地将该机制引入多媒体组播传输系统中 .