硅灰裹集料对碱－硅酸反应的抑制作用

采用硅灰包裹活性集料的工艺措施，显著地提高了硅灰抑制碱－硅酸反应（ＡＳＲ）的有效性；并证实这种工艺对抑制存在外部碱源时的ＡＳＲ也极为有效．     

Sitting at the virtual poker table: A prospective epidemiological study of actual Internet poker gambling behavior

Internet gambling is a potential object of addictive behavior and consequently an important concern for public health. Epidemiological analyses of Internet gambling are necessary to determine the extent of public health threat. This paper reports the results of the first prospective epidemiological study of actual Internet poker gambling behavior. Participants were 3445 Internet gambling service subscribers who enrolled during February 2005. Data include two years of recorded poker outcomes (i.e., chips bought and sold) for each poker session played. Among our sample, we identified two subgroups of poker players. Approximately 95% of the sample bought a median of €12 worth of chips at each of two poker sessions per week during a median duration from first to last bet of six months. A smaller subgroup (i.e., 5%) of most involved poker players bought a median of €89 worth of chip at each of 10 sessions per week during a median duration from first to last bet of 18 months. In addition to level differences, we report the differences in patterns of behavior observed between these two subgroups. The analyses presented in this paper suggest that the majority of Internet poker players moderated their behavior based on their wins and losses. A minority of most involved players did not show such moderation. These results have important implications for both gambling-and addiction-related research.     

Study on engineering properties of sand strengthened by mixed fibers and polyurethane organic polymer

Bulletin of Engineering Geology and the Environment - A considerable number of engineering hazards are caused by loose internal structure of sands. Thus, many researchers have explored a variety of...     

Retrieval of colour and texture images using local directional peak valley binary pattern

Pattern Analysis and Applications - Many content-based image retrieval (CBIR) methods are being developed to store more and more information about images in shorter feature vectors and to improve...     

Electrochemical studies of LiB compound as anode material for lithium-ion battery

Electrochemical studies of LiB compound were carried out for its application as anode for lithium-ion battery. The compound exhibited a reversible discharge-charge behavior between 0 and 0.75 V versus Li/Li⁺ with a first discharge capacity of 293 mA h g⁻¹. Discharging to 1.0 V, the first discharge capacity of LiB compound was 660 mA h g⁻¹, but a part of this capacity was irreversible. Impedance spectra were measured at several potentials corresponding to different discharge plateaus. The impedance spectra obtained below and above 0.8 V presented significantly different features. The solid electrolyte interphase layer (SEI) was formed below 0.8 V and assumed a good performance of LiB electrode in this potential range. The SEI was found to deteriorate above 0.8 V, which might be associated with the irreversible discharge capacity.     

304不锈钢在NaCl-(NH4)2SO4-NH4Cl溶液中的腐蚀行为

用电化学极化曲线和交流阻抗方法，研究了对304不锈钢（304SS）在3％NaCl和NaCl-（NH4）2SO4-NH4Cl混合溶液中的腐蚀行为．结果表明，在混合溶液中浸泡750h后，304SS仍然保持良好的钝化状态，其平均腐蚀电流密度为0．056mA／cm^2．根据交流阻抗研究结果，不锈钢在3％NaCl溶液中，主要表现出裸金属表面的点蚀和形成一定程度的钝化膜的特征，在2．0g／LNaCl、0．67g／L（NH4）2sSO4、2．3g／LNH4Cl混合溶液中，不锈钢表面形成稳定致密的钝化膜的典型特征．此钝化膜的电阻远小于腐蚀反应极化电阻．即使在形成良好的钝化膜的情况下，不锈钢所表现出的优良的抗腐蚀性能主要是由于金属表面活性点的钝化，而非钝化膜对离子导电或者对反应物／产物的扩散过程的阻隔作用．     

Cerium-zinc redox flow battery: Positive half-cell electrolyte studies

Experimental work was performed to evaluate the Ce3+/Ce4+ redox couple in methane sulfonic acid (MSA) electrolyte for use in redox flow battery (RFB) technology. The electrochemical behaviour of the Ce3+/Ce4+ in MSA media was investigated using cyclic voltammetry, linear sweep voltammetry, chronoamperometry and rotating disc electrode. The standard rate constant of the Ce3+/Ce4+ redox reaction on graphite electrode in MSA was 4.06×10-4 cm/s. The diffusion coefficient of Ce3+ in MSA was 5.87-6.15×10?6 cm2/s, and was 2.56-2.68×10?6 cm2/s for Ce4+. The energy efficiency of a cerium-zinc test cell was 74.8%. The high stability of cerium salts in MSA media and relatively fast redox kinetics of the Ce3+/Ce4+ redox reaction at graphite ectrode indicated that the Ce3+/Ce4+ might be well suited for use in RFB technology.     

Attitudes towards homosexuality and male and female reactions to homosexual and heterosexual slides.

Investigated the relationship between attitudes toward male and female homosexuality and Ss' reactions to slides of various explicit sexual activities (including homosexuality, lesbianism, heterosexual activity, and group sex). Attitudes toward homosexuality and lesbianism were highly correlated. Saskatchewan males were more antihomosexual than an Ontario sample, supporting the suggestion that there is greater concern with "machismo" among males on the Prairies. 34 male and 31 female undergraduates were divided into those opposed to homosexuality (anti-H) and those not opposed (H-neutral) on the basis of attitude scale scores. While the 4 groups substantially agreed in the relative rating of the slides, anti-H Ss of both sexes rated the slides as more pornographic and evaluated them more negatively than H-neutral Ss. Females rated them more negatively than males, while males rated all but the male themes (male nude, masturbation, homosexual) more sexually arousing than did females. Males reacted more negatively to the male themes than to the comparable female themes. Female Ss showed no such difference. (French summary) (1 p ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Transition from ripples to faceted structures under low-energy argon ion bombardment of silicon: understanding the role of shadowing and sputtering

Abstract

In this study, we have investigated temporal evolution of silicon surface topography under 500-eV argon ion bombardment for two angles of incidence, namely 70° and 72.5°. For both angles, parallel-mode ripples are observed at low fluences (up to 2 × 10¹⁷ ions cm^-2) which undergo a transition to faceted structures at a higher fluence of 5 × 10¹⁷ ions cm^-2. Facet coarsening takes place at further higher fluences. This transition from ripples to faceted structures is attributed to the shadowing effect due to a height difference between peaks and valleys of the ripples. The observed facet coarsening is attributed to a mechanism based on reflection of primary ions from the facets. In addition, the role of sputtering is investigated (for both the angles) by computing the fractional change in sputtering yield and the evolution of surface roughness.

PACS

81.05.Cy, 81.16.Rf, 61.80.Jh, 87.64.Dz