Nanostructured polymer blends: Synthesis and structure

Nanostructured polymer blends prepared via anionic ring opening polymerizations of cyclic monomers in the presence of a pre-made polymer melt exhibit a number of special properties over traditional polymer blends and homopolymers. Here, we report on a simple and versatile method of in situ polymerization of macrocyclic carbonates in the presence of a maleic anhydride polypropylene (mPP) matrix and a surface-active compatibilizer (i.e. PC grafted onto a mPP backbone generated in situ) to yield a micro- and nanostructured polymer blends consisting of a polycarbonate (PC) minor phase, and a polypropylene (PP) major phase. By varying the processing conditions and concentration of the macrocyclic carbonate it was possible to reduce the size of the PC dispersions to an average minor diameter of 150 nm. NMR and TEM characterizations indicate that the PC dispersions do not influence crystal content in the PP phase. Overall, the results point to a simple strategy and versatile route to new polymeric materials with enhanced benefits.     

浅谈游戏UI

两年前，笔者的上司就告诫笔者UI有很大发展潜力。果然，随着现在越来越多的游戏公司把目光投向休闲游戏的开发，UI设计人员的需求也相应大幅增长。最近很多公司都开始招揽UI设计师，专业的游戏UI设计师一时供不应求，待遇也比以前上涨很多。     

The effect of verbal elaborations on memory in young and older adults

The Stein paradigm was used to examine the circumstances under which verbal elaborations enhance memory in young and older adults. Subjects studied target adjectives that were embedded in one of three sentence contexts that varied in elaboration of the subject-adjective relationship: (1) nonelaborated base sentences; (2) base sentences with semantically consistent, but arbitrary verbal, elaborations; and (3) base sentences with explanatory verbal elaborations that clarified the significance of the subject-adjective relationship. The presence of the elaborations was varied at encoding and retrieval, and cued recall of the target adjectives was tested with incidental and intentional learning procedures. In Experiments 1A and 1B, explanatory elaborations at encoding and retrieval yielded the largest memorial facilitation for both young and older adults, and the benefit was comparable for the incidental and intentional learning measures. In Experiment 2, age-related differences in recall were minimal with explanatory elaborations at encoding and retrieval, but larger age differences occurred in the nonelaborated comparison conditions. In Experiment 3, explanatory elaborations present at encoding but not at retrieval enhanced recall when the original Stein stimuli were used, but not with the present stimuli. The implications of these results with regard to the mnemonic efficacy of verbal elaborations for young and older adults are discussed.     

风起云涌

已经过去的世界电子竞技大赛（即WCG）,谁还继续去关心？一路回忆WCG2008的点点滴滴,我突然又忍不住激动起来。WCG2008对于我来说,究竟有着怎么样的印象？也许很难和大家解释,也许很难说得清楚,可能这一次深刻的德国之行将会永远定义于众多比赛在大脑中的呈现,那么我现在就回忆着记住它的理由吧。     

显示设备

显示器用的液晶面板价格近期呈全线上扬的态势，从17英寸、19英寸到19英寸宽屏，都有2～6美元的价格上涨，这很可能预示着主流液晶显示器的价格即将全面反弹。不过，20英寸以上的液晶面板将改用第七代生产线，因此成本又会大幅度下调。因此，业界的普遍预期是液晶显示器价格短期内会有所波动，而大屏幕产品价格将长期走低。     

Wetting Kinetics and the Strength of Adhesive Joints

The work of adhesion, depending solely on the contact angle and surface tension, is unreliable as a guide to the strength of a joint. The kinetics of joint formation, exemplified by the rate of wetting, is also important and can be measured by rate of change of contact angle, a process for which an empirical equation has previously been suggested. A proposed mechanism introduces a viscosity term into the differential form of this equation.

A series of metal lacquers was prepared from epoxy, U/F and M/F resins in various ratios and also epoxy/P/F and epoxy/acrylic mixtures. Stainless steel substrates, coated with these lacquers were then cemented together using polyethylene as an adhesive. It is shown that joint strength correlates better with a high wetting constant (γ/ηL) than with a low contact angle except where this is very low.     

Effectiveness of a video-based motivational skills-building HIV risk-reduction intervention for inner-city African American men.

Interventions to reduce HIV risk behavior have shown promise but have demonstrated inconsistent effects with heterosexual men. This article reports a cognitive-behavioral HIV risk reduction intervention designed for heterosexually active African American men. Men (N?=?117) recruited from a public clinic were randomly assigned to either (a) a 6-hr video-based small group motivational-skills intervention, or (b) a 6-hr video-based contact-matched HIV education comparison group. Results showed men in the motivational-skills intervention reported lower rates of unprotected vaginal intercourse and higher rates of condom use at the 3-month follow-up. However, because of increased condom use in the comparison condition, differences between groups dissipated 6 months following the intervention. These findings are among the first to demonstrate effects from a motivational-skills intervention for reducing HIV risk in men who have sex with women using a model designed to facilitate transferring prevention technology to community settings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)