母语思维对儿童第二语言习得的积极影响

关于母语思维与二语习得的关系,学界已有不少论述,但大多注重研究母语思维对二语习得的消极负面影响,对其积极正面影响则探讨不多。造成这一问题的关键就是认识研究的方法是机械的、片面的,而非辩证的、科学的。母语思维与二语习得具有三重关联性,即外在关联性、本质关联性和过程关联性,因此母语思维在儿童二语习得过程中,除了其消极影响外,它还有助于儿童理解、消化和吸收第二语言信息,进而帮助儿童更好地完成第二语言习得。     

信用证结算方式下出口商的风险与防范

在信用证结算方式下,出口商会面临进口商的道德问题、开证行倒闭、单证不符、信用证软条款、直寄提单等风险。出口商应该通过对相关客户进行资信调查、加强催证审证工作、认真制作单据、要求信用证加具保兑等措施来规避风险。     

大学低年级学生作文中"心理使役动词"应用分析--基于大学生英语写作中的"母语迁移"实证研究

通过对大学一、二年级阶段英语写作中心理使役动词的运用情况进行量化分析，可以发现学生习得心理使役动词的困难和可能发生迁移的区域，这有利于加强对该阶段学生心理使役动词英语表达特点的了解，从而能有针对性地进行大学基础阶段的英语教学，提高学生的实用英语水平。     

桑叶提取物对DPPH自由基的清除能力研究

以超声波法对桑叶有效成分进行提取,得到Ⅰ、Ⅱ、Ⅲ共3个提取物,然后采用二苯代苦味酰肼自由基（DPPH·）法对提取物进行了自由基清除试验。结果表明：3个桑叶提取物对DPPH自由基均具有较好的自由基清除能力,这说明了桑叶可作为自由基清除物质资源开发利用。     

黄粉虫体内乙酰胆碱酯酶（AChE）的分布和纯化方法

文章研究了黄粉虫乙酰胆碱酯酶（AChE）的体躯分布和纯化方法技术。结果表明：黄粉虫幼虫和成虫体内乙酰胆碱酯酶活性均集中在头部和胸部,腹部的乙酰胆碱酯酶活性显著低于头部和胸部。成虫体内乙酰胆碱酯酶活性明显高于幼虫。通过Sepharose4B和SephadexG-200纯化后,AChE的最高纯化倍数是3.86和18.84倍。     

二语写作的文化导入

写作是一种深嵌入文化的行为,二语写作是书面形式的复杂的跨文化交际活动。对比修辞学为二语写作教学的文化导入提供了理论依据。在二语写作教学的选词、造句、组段、谋篇等指引性程序训练中,文化导入的主要内容为词汇文化、句法文化、语篇文化。语言知识的习得与文化习得同步发展,有助于二语学习者产出地道的、体现其文化精髓的作品。     

Lukasiewicz蕴涵算子的导出算子及其n值逻辑系统Ln

讨论了剩余类蕴涵算子之一Lukasiewicz蕴涵算子的导出算子的三值系统L3和n值逻辑系统Ln（n〉3）,首先给出了L3的真值表,它是C2真值表的扩充,它也保持MP规则和正则性,接下来讨论了b中的重言式（tautology）与IPC（inmitionistic propositional calculus）公理之间的关系以及L3的准重言式与C2的重吉式之间的关系。最后考虑了Ln中的予代数及不同逻辑系统Ln中重言式的比较。     

民国安徽女诗人吕美荪及其诗作简论

吕美荪是民国时期著名的女诗人,性格豁达旷放,一生极具传奇色彩。其诗作极多,具有丰富的内涵,既有对时间的流逝与生命的浩叹,又表现了自己幽栖的心境和对各地景物的妙赏,同时还有很多唱和、赠别怀人之作。吕美荪的诗不仅想象奇诡、壮观、飞动,而且体现了＂力＂的二律背反与＂力＂的平行四边形状态的特点,同时又极具＂游＂的风神。     

A cognitive TV white space-broadband power line MIMO system for indoor communication networks

Broadband power line communication (BPLC) is a promising solution to satisfy the growing data rate demands for broadband indoor communication networks. However, the BPLC transmission power spectral density (PSD) is restricted in the very high frequency (VHF) band to avoid harmful interference to the existing wireless services. In this paper, a new hybrid system is proposed utilizing BPLC and cognitive radio over TV white space (TVWS) to enhance the system capacity over BPLC in VHF, forming a VHF TVWS BPLC multiple-input multiple-output (MIMO) system. An iterative precoding algorithm is proposed to satisfy the interference limit at the TV primary user (PU) receiver (Rx) and enhance the ergodic capacity. Moreover, a power allocation algorithm is developed for the MIMO system to achieve the maximum ergodic capacity subject to the average total power constraint and limit of interference to TV PU. Simulation results demonstrate the significant enhancement in the achieved capacity by our proposed system in the VHF band compared to both previous cognitive and hybrid BPLC systems.     

The climate for entrepreneurship at higher education institutions

While the importance of a supportive context for entrepreneurship is widely acknowledged, its antecedents are rarely investigated. We apply the concept of organizational climate to higher education institutions and examine the drivers of students’ perceptions of the entrepreneurial climate in their university. Combining data from two unique datasets and using multilevel techniques, we analyze the relationship between university characteristics and such climate perceptions of 8009 students at public universities in Germany. We find university entrepreneurship measures to have a positive effect on students’ climate perceptions, which also depend on students’ background and gender. In addition, we find evidence for different peer effects, depending on students’ affinity for entrepreneurship. For the general student population, including entrepreneurship content in their normal studies seems to be required to initiate a social process of sensemaking. However, students’ perception of the entrepreneurial climate only depend to a certain degree on intentional entrepreneurship measures. In our study, general university characteristics have the strongest influence on climate perceptions. Overall, our study adds to our understanding of which parameters are important for establishing a more favorable and inspiring climate for becoming an entrepreneur at higher education institutions.