社会科学概念建构中的“复合单数”机制——兼论“知识建构社会”

概念是建构人类知识大厦的基石。"复合单数"是社会科学概念建构的主要方式之一,但目前学术界对这一现象的重视明显不足。概念的复合单数建构体现在将具有复合涵义的争议性概念强制单数化为目标概念的涵义上,复合单数的过程同时是目标概念的地位上升和涵义重塑过程,即目标概念通过复合单数建构而上升为社会的核心概念。与描述性概念和规范性概念的建构方式比较,复合单数在建构方式、动力、主体和时间序列上表现出明显的特性,同时,它也表明了知识建构社会的主要方式。

论20世纪二三十年代中国电影与文学概念的互动及其复杂性

20世纪二三十年代是中国社会的剧变期,也是作为学科基础的“电影”概念的形成期。作为姊妹学科文学的核心概念之一,“文学性”跨越学科、媒介疆界,参与到早期中国“电影”概念及相关理论建构中。电影与文学的百年互动,学界通常简化为线性时序下事件性的集合,注重作为新兴艺术的电影与文学的代际式差异,强调电影为寻求自身的独立性而与文学进行的渐进式的关系切割。简单将文学嵌入电影论题并不足以把握关键概念,借助跨媒介的“居间”视角、深入历史裂隙观照二者的互动十分必要。事实上,在文学试图统摄电影而电影又力图与文学剥离的相互角力过程中,以“电影的文学性”一语为焦点,“文学”“影戏”“文学性”“电影性”等新旧语义交叉、重叠于“电影”概念一身,并且潜隐着保守抑或进步等丰富的社会、政治与文化信息,体现出一种“不同时的同时性”。梳理与重审这一历史复杂性状况,有利于敞现一段动态、开放的“电影”概念史,或可为电影理论与历史研究提供一条新的进路。

Composition Operator from Logarithmic Bloch-Type Space to Bergman Space on Unit Polydisc

In order to investigate the boundedness or compactness of composition operator from the logarithmic Bloch-type space to the Bergman space on the unit polydisc, the classic Bergman norm is firstly changed into another equivalent norm. Then according to some common inequalities, the properties of logarithmic Bloch-type space and the absolute continuity of the general integral, the conditions which the symbol map must meet when the composition operator is bounded or compact are obtained after a series of calculations, and the boundedness and compactness are proved to be equivalent.

Tensile behaviors of ecological high ductility cementitious composites exposed to interactive freeze-thaw-carbonation and single carbonation

To explore the tensile property parameters in the structural design of bridge deck link slabs made by ecological high ductility cementitious composites (Eco-HDCC), the tensile properties of Eco-HDCC exposed to interactive freeze-thaw-carbonation cycles and single carbonation cycles were studied. The carbonation front of Eco-HDCC was determined by X-ray diffraction and differential scanning calorimetry-thermal gravimetric methods. Results indicate that the carbonation front of Eco-HDCC after interaction tests is deeper than that of Eco-HDCC after single carbonation tests. In addition, the ultimate tensile strength for Eco-HDCC shows an increasing trend after the interaction of 1 to 5 cycles compared with that of virgin specimens, while the ultimate tensile strength decreases after the interaction of 10 to 15 cycles. For single carbonation tests, the ultimate tensile strength of Eco-HDCC increases as cycles increase. After being subjected to interaction and single carbonation environments, both the ultimate tensile strain and tensile strain energy of Eco-HDCC decrease as cycles increase, and the decrease degrees of Eco-HDCC after interaction cycles are larger than those of Eco-HDCC after single carbonation. For general consideration, the tensile stress-strain relationship of Eco-HDCC after the interaction of 15 cycles can be adopted in the design of bridge deck link slabs for the purpose of safety.

Experimental Design on Laminated Veneer Lumber Fiber Reinforced Composite： Processing Parameters and Its Durability

The investigating of the hot press process parameters on the flexural properties of LVL （Laminated Veneer Lumber） reinforced composites derived from rubber wood veneer reinforced with fiber glass woven and epoxy adhesive were performed via the DOE （design of experimental） approach. It was discovered that pressure was the most significantly and negatively effect on the product properties. Enhancing in the mechanical properties was related to decrease the processing pressure. Beside, press time was also significantly and positively effect. Although time was not clearly reflect from the mechanical results, but it was detected from the ANOVA （analysis of variance）results. The mechanical properties were increased with increasing compression time. From the results, the optimal condition to maximize mechanical properties was assumed at low pressure, 15 bars, low temperature, 70℃, and long time, 60 mins. The durability testing including screw nail withdrawal strength, water absorption, and termite resistance of LVL reinforced composite were also studied. The results are shown that the LVL wood has superior properties when compare with solid woods. It was found the withdrawal strength of LVL reinforce composite was higher than the solid woods. As expected that solid woods, except eucalyptus, had low water absorption resistance as it more hygroscopic corresponded to LVL reinforced wood. Also solid woods, except teal（, had low resistance to termite attack. Therefore, LVL reinforced was the best candidate by mean of durability properties compared to solid wood.

Essential Norms of Composition Operators Between Hardy Spaces of the Unit Disc

The authors express the essential norms of composition operators between Hardy spaces of the unit disc in terms of the natural Nevanlinna counting function.