荧光探针法研究结构明确的BzO-PDMAEMA均聚物水溶液性质

通过氧阴离子聚合合成了一系列不同相对分子质量的结构明确的BzO—PDMAEMA，用芘作为荧光探针研究了BzO—PDMAEMA在水溶液中的胶束化行为，发现CMC值与用表面张力法测得的结果相一致，即随BzO—PDMAEMA相对分子质量的增加而减小，但荧光探针法测得的CMC值稍大；LCST值则随相对分子质量的增加而增加。     

煤调湿工艺及其经济效益分析

介绍了煤调湿技术的工艺过程，分析了应用汽化上升管装置，回收焦炉自身余热，进行煤调湿的经济效益与节能效果。     

网络交际与语言学研究新视角

计算机网络不仅为人类提供了一种新型的交流工具,而且为人类交往开辟了新的空间。网络交际具备全球性、跨文化性、双向互动和平等性、信息资源的共享性、虚拟性、语言符号的丰富性等特征。网络交际的普及向传统语言学提出了挑战,推动着现代语言学的嬗变、重构和创新。本文拟从网络交际的历史发展和特点出发探讨网络时代语言学研究的新领域和新视角。     

Development of a Net Shape Manufacturing Method for Ventilated Brake Discs in Single Piece Design

Carbon fibre reinforced ceramic matrix composites (CMC), originally developed for lightweight heat shields of spacecraft, are used for high performance brake discs in sports cars from different manufacturers. In contrast to the CMC materials for space applications, based on woven fabrics and costly manufacturing methods, these low cost friction materials are produced by liquid silicon infiltration of porous Carbon/Carbon (C/C) preforms, based on short fibre reinforced CFRP green bodies manufactured via warm press technique. In this work, different manufacturing methods for ventilated CMC brake discs are compared to each other, and the development of a new technology for the manufacture of single piece C/C‐SiC brake discs in net shape technique is presented.     

Non-Newtonian Fluids in Spout-Fluid Beds: Mass Transfer Coefficient at Low Reynolds Numbers

Following on from the work of Anabtawi et al. (2003), this study examined how the volumetric liquid-phase mass transfer coefficient, k_La, of oxygen in air in three-phase spout-fluid beds was affected by varying the system parameters of bed height, bed diameter, gas velocity, and liquid velocity. The liquid used was 0.1% CMC solution, displaying a pseudo-plastic rheology, with 1.75 mm glass spheres as packing. The values of the Sherwood number were lower than in previous studies (Anabtawi et al., 2003), in the range 9,000-186,000. Gas velocity had a similar effect on k_La as in a bubble column, with results also giving good agreement with previous work on two-phase and three-phase spouted bed systems. The correlation obtained for the effect of liquid velocity on k_La compared well with that of Schumpe et al. (1989). An increase in the height of packing increased k_La to the power of 0.319, with an increase in column diameter also causing an increase in k_La, which is in agreement with the results of Akita and Yoshida (1973).     

The structure of support: Mapping network evolution in an online support group

Online social support groups enable individuals to create specialized networks that provide access to a variety of resources. Although the efficacy of such communities has been studied, less understood are the structural mechanisms behind their emergence and the ways these mechanisms foster ties and may subsequently affect provision of support. This paper analyzes an online support group (OSG) for parents of children with ADD/ADHD over a one-year period, focusing on the interplay of structure and technology in the creation of the emergent support network. Findings highlight a dual network structure that supports a variety of relationships and levels of participation. Whereas a core group of members generates the initial content, the network becomes self-sustaining and supports a fluid membership between active and inactive members. Structurally, the network offers four types of support: direct, indirect, relational, and functional. Together, findings emphasize the interplay among technology, structure, and communication in advancing specialized channels of communication in a digital age.     

用低能耗的CTMP生产高强度、高松厚度纸板

用表面改性的CTMP浆料来生产高强度和高松厚度的纸张,这主要是通过淀粉和C M C（羧甲基纤维素）利用多层或MIX技术吸附在纤维表面上以达到改性的效果。结果表明,CTMP经过表面改性后,在保持紧度的条件下其抄造的纸张平面内和平面外性能是未经改性的2倍多。这可以改善纸张弯曲挺度或降低多层纸板的定量。     

Texting insincerely: The role of the period in text messaging

Text messaging is one of the most frequently used computer-mediated communication (CMC) methods. The rapid pace of texting mimics face-to-face communication, leading to the question of whether the critical non-verbal aspects of conversation, such as tone, are expressed in CMC. Much of the research in this domain has involved large corpus analyses, focusing on the contents of texts, but not how receivers comprehend texts. We ask whether punctuation – specifically, the period – may serve as a cue for pragmatic and social information. Participants read short exchanges in which the response either did or did not include a sentence-final period. When the exchanges appeared as text messages, the responses that ended with a period were rated as less sincere than those that did not end with a period. No such difference was found for handwritten notes. We conclude that punctuation is one cue used by senders, and understood by receivers, to convey pragmatic and social information.     

Characterization of micellar systems produced by new amphiphilic conjugates of poly(ethylene glycol)

This study proposes polymeric micelles produced using new amphiphilic conjugates between amino- or carboxy-mPEG₂₀₀₀ and three different α-lipoamino acids (PEG-LAA). The characterization of these colloidal systems showed CMC values, in the order of 10^?5?M, that are interesting in the view of an in vivo administration. The PEG-LAA micelles also showed a good stability at 37?°C and upon dilution in aqueous media. Using a colored probe as a model lipophilic compound, the loading efficiency and in vitro release profile were also outlined.