机械合金化和热处理对高熵合金MgTiVCrNi微观组织演化和相结构的影响

通过机械合金化球磨反应制备了含不同组元数和等摩尔比组成的合金体系Mg-TiV-Cr-Ni,利用XRD、EDS能谱分析、TEM以及DSC/TG热分析了组元数及热处理对合金球磨产物微观组织和相形成规律的影响.结果表明:经20h球磨后,二元合金Mg-Cr、Mg-V与MgTi体系几乎不发生合金化反应,随合金主组元数的增加,高混合熵效应可促进多元合金组元之间的相互反应和固溶,其中五元高熵合金Mg Ti VCr Ni球磨产物可形成富Mg的非晶相与贫Mg的纳米晶BCC型相.经400~600℃热处理后,合金Mg Ti VCr Ni球磨组织中的非晶相经晶化后转变为新的和贫Mg的BCC型结构相,当温度提高至600℃时,残余的金属Cr逐渐在BCC型相中固溶,最终形成稳定的单相BCC型固溶体.球磨高熵合金Mg Ti VCr Ni中形成的BCC型固溶体结构具有较高的热稳定性.     

泉州品牌经济可持续发展之产业动漫化路径

基于宏观与微观分析,得出"十三五"期间泉州品牌经济可持续发展总体态势乐观的判断,并围绕泉州品牌经济可持续发展路径问题,提出产业动漫化营销将是泉州制造业创新品牌营销的有效路径,文章最后就近年来泉州制造业产业动漫化营销实践,选取泉州子燕轻工、晋江金威和特步集团三个产业动漫化品牌营销实例做了分析。     

Correlation analysis of gene polymorphisms and β-lactam allergy

A total of 64 patients with β-lactam allergy and 30 control subjects were enrolled in a case-control study. This study is aimed to analyze the relationship between β-lactam allergy and 10 single nucleotide polymorphisms (SNPs) in interleukin-10 (IL-10), IL-13, IL-4Rα, high-affinity immunoglobulin E-receptor β chain (FcεRIβ), interferon γ receptor 2 (IFNGR2), and CYP3A4, and within the Han Chinese population of Northwest China. Genotyping for the SNPs was conducted using the Sequenom MassARRAY®platform. SPSS 17.0 was employed to analyze the statistical data and SHEsis was used to perform the haplotype reconstruction and analyze linkage disequilibrium of SNPs of IL-10 and IL-13. The results showed that the genotype distribution of CYP3A4 rs2242480/CT differed significantly between case and control groups of males (P=0.022; odds ratio (OR)=0.167, 95% confidence interval (CI): 0.032–0.867). Further analysis showed that CCA, CCG, and TAA haplotypes of IL-10 had no significant correlation in patients with β-lactam allergy. The correlation between CCT and CAC haplotypes of IL-13 and β-lactam allergy needs to be further studied. The analysis did not reveal any differences in the distribution of others gene polymorphisms between cases and controls.     

Leaf and root glucosinolate profiles of Chinese cabbage (Brassica rapa ssp. pekinensis) as a systemic response to methyl jasmonate and salicylic acid elicitation

Glucosinolates (GSs) are an important group of defensive phytochemicals mainly found in Brassicaceae. Plant hormones jasmonic acid (JA) and salicylic acid (SA) are major regulators of plant response to pathogen attack. However, there is little information about the interactive effect of both elicitors on inducing GS biosynthesis in Chinese cabbage (Brassica rapa ssp. pekinensis). In this study, we applied different concentrations of methyl jasmonate (MeJA) and/or SA onto the leaf and root of Chinese cabbage to investigate the time-course interactive profiles of GSs. Regardless of the site of the elicitation and the concentrations of the elicitors, the roots accumulated much more GSs and were more sensitive and more rapidly responsive to the elicitors than leaves. Irrespective of the elicitation site, MeJA had a greater inducing and longer lasting effect on GS accumulation than SA. All three components of indole GS (IGS) were detected along with aliphatic and aromatic GSs. However, IGS was a major component of total GSs that accumulated rapidly in both root and leaf tissues in response to MeJA and SA elicitation. Neoglucobrassicin (neoGBC) did not respond to SA but to MeJA in leaf tissue, while it responded to both SA and MeJA in root tissue. Conversion of glucobrassicin (GBC) to neoGBC occurred at a steady rate over 3 d of elicitation. Increased accumulation of 4-methoxy glucobrassicin (4-MGBC) occurred only in the root irrespective of the type of elicitors and the site of elicitation. Thus, accumulation of IGS is a major metabolic hallmark of SA- and MeJA-mediated systemic response systems. SA exerted an antagonistic effect on the MeJA-induced root GSs irrespective of the site of elicitation. However, SA showed synergistic and antagonistic effects on the MeJA-induced leaf GSs when roots and leaves are elicitated for 3 d, respectively.     

以社会化模式为突破口,加快学前教育专业艺术实践教学转型升级

学前教育专业艺术实践教学是整体教学中的重要一环,针对新时期专业学生成才需要和社会实际需求,应广泛采取社会化工作方式,推进院校和社会有关方面加强合作,整合利用好各类社会资源,搭建学前教育专业艺术实践教学平台,探索推行一整套全新的教学模式,抓好专业教师实践教学能力提升,服务专业实践教学,实现均衡科学发展,努力培养一大批优秀的学前教育专业人才。     

论英语新闻语篇中显性与隐性评价的动态关系

新闻体裁的客观性、真实性准则决定了新闻话语在不同程度上限制显性评价的呈现,而其中的隐性评价则需要读者通过对描述性话语的正确解读进行合理推断。因此我们将显性、隐性评价与及物结构之间构建联系并探索其中规律,同时结合动态语境进行研究,力图达到对新闻语篇评价色彩整体、准确的把握。     

研发投入、融资约束与出口绿色技术含量

本文基于异质企业的视角,通过修正新古典投资模型分析了企业研发投入、融资约束影响出口绿色技术含量的机理,并构建了企业层面的出口绿色技术含量指标,利用8万多组企业数据对此机理进行验证。得到的结论有:1.企业研发投入对出口绿色技术含量具有显著的正向影响,但私有企业的研发投入的效果要明显好于公有企业、非污染密集型企业的研发投入效果明显好于污染密集型企业。2.融资约束在企业研发影响出口绿色技术含量中具有调节作用,融资约束的这种调节作用在私有控股企业和非污染密集企业中较显著,但该调节作用在公有控股企业和污染密集性企业中不显著。     

出口学习、研发效应与企业生产率提升——来自中国制造业企业的经验证据

基于异质性企业理论的相关国内文献,大多集中在检验中国企业是否存在"出口学习效应",对如何产生"出口学习效应"的具体机理较少涉及。本文认为,产生"出口学习效应"的主要原因来自企业出口后的研发概率与绩效更高,在出口过程中企业会更有可能选择研发投入,且带来的生产率提升更为显著;本文以2004-2007年中国工业企业数据库为样本,基于多达100万个样本点的大数据进行实证检验,结论认为:中国制造业企业出口后选择研发投入的可能性会增加21.63%,而研发投入的选择,给这类企业带来了每年约7.3%的生产率提升。中国企业的出口不仅可以发挥比较优势,解决劳动力就业问题,同时也是为中国制造业企业更加自主选择研发投入,并在中长期提升生产率,获得动态优势的重要途径。     

异步传输网络的频域分块频谱估计算法

异步传输网络间通信信道组成复杂,对异步传输网络间通信信道的频谱的准确估计可以避免不占用多余的频带,能够实现高数据率通信。提出一种基于频域分块和脉冲响应的异步传输网络频谱估计算法。构建异步传输网络通信信道模型为缓慢时变、空变的相干多途信道,采用正交频率复用OFDM训练序列得到确定的起始帧概率分布,采用同步算法能有效减少系统子载波间的正交性抑制,得到系统函数的基本特征传递函数,实现对频域分块频谱估计。仿真结果表明,该算法能有效提高对频谱的估计精度,提高异步传输网络的通信性能,网络异步数据传输的吞吐量大幅提高。     

组合逻辑电路的设计和仿真

以两个组合电路的设计和仿真为例,简述了EWB仿真软件中逻辑转换仪的使用方法和特点.EWB的应用改善了数字电子技术教学手段.