Motivational biases in causal attributions of arousal.

Two studies hypothesized that the desire to seek ambiguity as to the cause of a particular state of arousal will increase if either that arousal state or its source is potentially threatening to self-esteem. In Exp I, 22 high- and 21 low-sex-guilt male undergraduates (as determined by the Mosher Forced Choice Sex Guilt Inventory) were shown either an arousing erotic movie or a nonarousing movie; in Exp II, 28 high- and 28 low-guilt females were led to believe that they were very aroused by pictures of nude men. Ambiguity was introduced into both situations by means of a bogus, nonthreatening, alternative arousal source (a placebo). Results indicate that high-guilt Ss were actively involved in the process of determining which source was arousing them. More importantly, this involvement appeared to be motivated by ego-defensiveness. In both experiments, when high-guilt Ss were confronted by an erotic stimulus, they chose to attribute arousal to the bogus source—and thus create ambiguity as to the actual cause and nature of their arousal—more than did low-guilt Ss. (23 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Chevron coal liquefaction process (CCLP)

For a number of years, work has been carried out at Chevron Research Company directed at development of a new approach to coal liquefaction. The processing sequence uses two separate, but close-coupled, reaction zones. The first is used to contain and control dissolution reactions; the second contains and controls hydrofining reactions. Each is designed to maximize efficiency for achieving its particular function, as well as to allow control of product distribution and quality. The basic process, which can be considered ‘second generation’ relative to other coal liquefaction processes under development today, is called the Chevron Coal Liquefaction Process (CCLP). This process and its variants have been studied in integrated laboratory-scale pilot plants with capacities of 4.5—22.5 kg (coal) day ^?1. A 6 t day^?1 pilot plant is under construction in Chevron USA's Richmond, California, refinery to demonstrate larger-scale process and mechanical performances.     

Temperature dependence of the Young’s modulus and shear modulus of pure nickel,platinum, and molybdenum

A pulse-echo technique utilizing a wave guide operating at high temperatures has been used to measure the variation in the Young’s modulus and shear modulus of pure platinum, nickel, and molybdenum in the temperature range from 25 to 1000°. With the exception of Ni in the temperature range below the Curie point, linear behavior was found for all three metals. The significance of the linear relation between temperature and the elastic constants for Mo to the observed nonlinearity of the Arrhenius plot of the diffusivity of carbon in Mo is discussed.     

The impact of maternal HIV infection on parenting in inner-city African American families.

Parenting behavior and its association with child psychosocial adjustment were examined in inner-city African American families. Participants included 86 HIV-infected women and their noninfected children and 148 HlV-seronegativo women and their noninfected children. Interview data were collected concerning maternal physical health, parenting behaviors, and child psychosocial adjustment. The results indicated that mother-child relationship quality and monitoring were important parenting factors for adaptive child psychosocial functioning. HIV-infected mothers reported poorer mother-child relationship quality and less monitoring of their children's activities than did noninfected mothers, suggesting that maternal HIV infection may disrupt effective parenting. Directions for future research and clinical implications are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dynamics and dispersion modelling of nanoparticles from road traffic in the urban atmospheric environment—A review

Reducing exposure to atmospheric nanoparticles in urban areas is important for protecting public health. Developing new or improving the capabilities of existing dispersion models will help to design effective mitigation strategies for nanoparticle rich environments. The aims of this review are to summarise current practices of nanoparticle dispersion modelling at five local scales (i.e. vehicle wake, street canyons, neighbourhood, city and road tunnels), together with highlighting associated challenges, research gaps and priorities. The review begins with a synthesis of available information about the flow and mixing characteristics in urban environments which is followed by a brief discussion on dispersion modelling of nanoparticles. Further sections cover the effects of transformation processes in dispersion modelling of nanoparticles, and a critical discussion on associated structural and parametric uncertainties in modelling. The article concludes with a comprehensive summary of current knowledge and future research required on the topic areas covered.Appropriate treatment of transformation processes (i.e. nucleation, coagulation, deposition and condensation) in existing dispersion models is essential for extending the applicability of gaseous dispersion models to nanoparticles. Some modelling studies that consider the particles down to 1 nm size indicate importance of coagulation and condensation processes on street-scale modelling whereas others neglecting either sub-10 nm particles or Van der Waals forces along with fractal geometry suggest to discard these processes due to negligible effects on particle number and size distributions. Further, it is important to consider those transformation processes e.g. at city scale or in road tunnels because of the much longer residence time or much higher concentration levels compared to the street scale processes. Structural and parametric uncertainties affect the modelled results considerably. In particular, parametric uncertainty in the form of particle number emission factors appears to be the most significant due to considerably large variations in their estimates. A consistent approach to the use of emission factors, appropriate treatment of transformation processes in particle dispersion models and the evaluation of model performance against measured data are essential for producing reliable modelled results.     

安全及环保需求促中国工业火灾和气体探测器市场稳健增长

2012年制造业经济总体增速跟随整体GDP放缓,PMI指数呈“先扬再抑后稳”之态势,即年初冲高,年中探底,而年末趋于稳定。经济发展不确定因素及经济下行压力持续增加,     

Design issues for adaptive control charts

Adaptive control charts allow the components of the quality‐monitoring scheme to vary in order to obtain improved performance over non‐adaptive control charts. Research has centered on components such as the sample size, time between samples, warning limits, and control limits and has recommended a variety of schemes, many of which are optimal in some sense. In practice, there are many other adaptive schemes that are near optimal, which will still yield considerable improvement over non‐adaptive control charts. In addition, the impact of parameter estimation on adaptive control chart performance must be taken into consideration. Based on the simulation results shown here, adaptive control charts should only be used for mature processes, where a sufficient amount of Phase I data have been obtained to ensure that the estimated control limits are accurate. When evaluating control chart performance, we consider initial state performance measures for simplicity and note that the conclusions obtained here apply to steady‐state performance measures. The evaluation of performance measures is easily handled by the Markov chain approach detailed in the Appendix. Copyright © 2008 John Wiley & Sons, Ltd.     

Theoretical and experimental testing of a scaling rule for air current segregation of alumina powder in cylindrical silos

Air current segregation (ACS) is one segregation phenomenon that has been identified to contribute significantly to the separation of fines (particles < 42 µm) from coarse material during the filling of industrial silos. This paper describes investigations of ACS for alumina powder based on experiments conducted in an industrial silo, in the laboratory and by computation, using the commercial computational fluid dynamics code Fluent.For the industrial silo, the extent of ACS has been measured using the accumulation of fine material at the wall as an indicator. Based on these results, modifications to the feeding system were undertaken which showed that ACS is promoted if the material is fed in a dilute form. Experiments in the laboratory confirmed this effect visually. In order to be able to compare numerically the extend of ACS, a segregation index has been developed. It was found that a dilute particle jet leads to more ACS than dense particle jet.The effects of solids feeding rate and air extraction rate on ACS have been investigated in the laboratory silo and the results clearly show that low solids feeding rates promote ACS. It was further found that an increase in the air extraction rate has a mild effect in suppressing ACS. These effects were confirmed by the Fluent simulations, which showed an unexpectedly good agreement with the experiments.