Design of S-band circularly polarized double-layer microstrip antenna

This paper proposes a compact polarization microstrip antenna based on double-layer structure.The bandwidth of the whole antenna is widened by expanding the top and bottom layers respectively.After the design of antenna structure and adjustment of size,the proposed antenna can achieve both the left-and right-hand circular polarizations in 2.33 GHz-2.97 GHz.Measurement results indicate that the effective bandwidth is 640 MHz in S-band and the relative bandwidth can achieve 24% with 11 S less than 15 dB.     

制度视野下的辞赋创作——以清代乾嘉时期为中心

清代是古代赋学的集大成期,无论是辞赋创作还是赋论都有十分重要的历史地位。赋学的繁荣除了统治者的辞赋创作与提倡外,科举试赋也是一个十分重要的因素,特别是乾嘉时期,针对律赋创作的疲苶倾向,赋论家提出＂以古文为时文＂的创作要求,既是辞赋文体自身的救赎,也是应合科举试赋的统治阶级意向的表现,对后期辞赋创作及古代赋学理论产生了积极的影响,而赋论强调＂丽则＂的观念也可以说是统治政策在文体风格方面的必然反映。     

曹寅第六番“佩笔侍从”考——兼与刘上生“佩笔侍从”说商榷

康熙四十九年秋曹寅有＂佩笔六番充侍从＂句,体察其意,盖曹寅在侍卫及内务府郎官任时有第一番侍从,在康熙后四次南巡期间分别有第二、三、四、五番侍从,在康熙四十九年春巡游五台山时有第六番侍从。曹寅的前五番侍从,研究者已有论述,对他的第六番侍从,则全无印象或知之不详,这不能不说是一个遗憾,笔者拟结合《清圣祖实录》的相关记载,对曹寅的第六番侍从作详细的考察,并与刘上生先生的＂佩笔侍从＂说商榷。     

论认知时空对语言时空的二次制约关系

由于人生活在时空范围内,任何言语交际都离不开时空表述ETS(The Verbal Expression of Time&Space),所以时空就成了交际的重要理论问题。但是交际中的"时空"不是笼统的,因为交际中除了"语言时空"外,还有"认知时空"。这两种"时空"不是互不相关的并列关系,而是有密切的制约和被制约关系。由此,我们提出"认知时空"对"语言时空"的四种制约关系:1.语义制约SR(Semantic Restrictions);2.理性制约RR(Rational Restrictions);3.语境制约CtR(Contextual Restrictions);4.历史制约HR(Historical Restrictions)。     

时间标度上二阶Endem-Fowler动力方程的振动性质

考虑时间标度上二阶Endem-Fowler动力方程的振动性质,通过Riccati变换等方法,建立了该方程振动的充分条件.     

A State-Wide School-Building Survey

ABSTRACT

The authors intended to (a) identify the association between gender or grade level and teachers’ homework (HW) feedback and (b) examine the relationship between teachers’ HW feedback, HW-related behaviors (e.g., amount of HW completed), and academic achievement. Four hundred fifty-four students (Grades 5–12) participated in this study. The results showed that (a) at higher grade levels, there is a lower perceived amount of teachers’ HW feedback; (b) teachers’ HW feedback as perceived by students is positively and significantly related to the amount of HW completed and to the perceived quality of HW time management but not to the amount of time spent on HW; (c) the amount of HW completed and the perceived quality of HW time management positively and significantly predict academic achievement; and (d) teachers’ HW feedback as perceived by students has an indirect relationship with students’ academic achievement by its effect on students’ HW-related behaviors.     

论现代汉语短时类副词的性质与范围

汉语时间副词中有一个小类主要表示“时阎闻隔短”,可称之为“短时类副词”。以往的研究对这一小类副词的描写非常简单,对其性质和范围的探讨尚存争议。文章运用句法学、语义学相关理论,在前人研究的基础上区分了“时点短时义”和“时段短时义”,对短时类副词的性质与范围提出了己见,并试图解决相关争议。     

邓小平南方谈话与马克思主义时代化

邓小平是我国改革开放背景下推进马克思主义时代化的伟大倡导者和坚定践行者。南方谈话作为一篇重要文献,在马克思主义时代化过程中具有重要的历史地位。其中主要在三个维度上推动了马克思主义时代化的进程：一是以回答时代主题为旨趣的理论言说;二是以吸收新的时代内容为指向的理论创新;三是以实事求是为内核的实践精神。     

语文教学内容的凝聚升腾——基于语文教学时空特定性的认识

文章从语文教育的渗透性与溶解性出发,基于语文教学时空特定性的认识,从知识内容的建构、思维工具与方法两个维度,提出了语文教学内容的凝聚如何取得语言文学界、知识界或学术界支持的整体构想。     

Influence of Organizing Strategies,Time, and Grade Point Averages on Retention Performance

Abstract

The relationships among retention performance, organizing strategy preference, and grade point average were assessed in 227 college students. Highly significant correlation coefficients suggest that the type of organizing strategy used in memorizing exerts a strong influence on the recall of paired associates over both short and long periods of time. Moreover, they seem to indicate that organizing strategy preference has promise as a predictor of grade point average.