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121.
Leaching of particle-bound metals affects the ability of settling ponds and other engineered structures to remove metallic pollutants, and leaching behavior is related to particle size. In this investigation, water borne soil particles were leached and fractionated with a split-flow thin cell, and the metal loadings were quantified as a function of particle size. For comparison of the metal-loading curves, different empirical modeling procedures were investigated to convert the data to a precise functional form suitable for quantitative comparison of changes in differential loading as a function of particle size. Results of this investigation are presented for a soil sample before and after leaching caused by simulated acid rain conditions. Following simulated acid rain leaching, the shape of the differential distribution curves change, and these changes reflect the particle size mediated leaching behavior. For the soil used in this demonstration, simulated acid rain leaching shifted the differential loading toward larger particle sizes, and the magnitude of the shift varied significantly among the metals. Because settling rate decreases as the square of particle size, this could potentially affect management decisions for settling ponds receiving these particles. The high precision afforded by the analysis allows the development of insight into the leaching mechanisms through comparing "partial" acid rain leaching with "total recoverable" leaching by EPA Method 3050. 相似文献
122.
Cooney CM 《Environmental science & technology》2002,36(23):440A-441A
123.
124.
Cooney CM 《Environmental science & technology》2002,36(3):56A-57A
125.
In this study, the transmission of Escherichia coli O157:H7 to lettuce plants through spray and surface irrigation was demonstrated. For all treatments combined, the number of plants testing positive following a single exposure to E. coli O157: H7 through spray irrigation (29 of 32 plants) was larger than the number testing positive following surface irrigation (6 of 32 plants). E. coli O157:H7 persisted on 9 of 11 plants for 20 days following spray irrigation with contaminated water. Immersion of harvested lettuce heads for 1 min in a 200 ppm chlorine solution did not eliminate all E. coli O157:H7 cells. The results of this study suggest that regardless of the irrigation method used, crops can become contaminated; therefore, the irrigation of food crops with water of unknown microbial quality should be avoided. 相似文献
126.
Slama I Dufresne C Jourdan E Fahrat F Villet A Ravel A Grosset C Peyrin E 《Analytical chemistry》2002,74(20):5205-5211
The retention and separation of D,L-dansylvaline enantiomers (used as test solutes) were investigated using silica gel as stationary phase and vancomycin as chiral mobile-phase additive. A retention model was developed to describe the mechanistic aspects of the interaction between solute and vancomycin in the chromatographic system. It considered the formation of vancomycin dimers both "free" in the mobile phase and adsorbed on silica. By fitting the model equation to experimental data, it appeared clearly that the approach taking into account the vancomycin dimerization described accurately the retention behavior of the compounds. The examination of the model equation parameters showed that the glycopeptide dimerization increased the enantioselectivity by a factor of approximately 3.7. This study demonstrated the preponderant role of the vancomycin dimerization on the chiral recognition process of D,L-dansylvaline. Also, an additional analysis on a vancomycin chiral stationary phase indicated that the addition of vancomycin in the mobile phase promoted a greater enantioselectivity mediated by the formation of dimers in the stationary phase. 相似文献
127.
Proctor C. Patrick; August Diane; Carlo María S.; Snow Catherine 《Canadian Metallurgical Quarterly》2006,98(1):159
This study explored a holistic model of English reading comprehension among a sample of 135 Spanish-English bilingual Latina and Latino 4th-grade students This model took into account Spanish language reading skills and language of initial literacy instruction. Controlling for language of instruction, English decoding skill, and English oral language proficiency, the authors explored the effects of Spanish language alphabetic knowledge, fluency, vocabulary knowledge, and listening comprehension on English reading comprehension. Results revealed a significant main effect for Spanish vocabulary knowledge and an interaction between Spanish vocabulary and English fluency, such that faster English readers benefited more from Spanish vocabulary knowledge than their less fluent counterparts. This study demonstrates the existence of literary skills transfer from the 1st to the 2nd language, as well as limits on such transfer. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
128.
Reviews the book, Forms of Intersubjectivity in Infant Research and Adult Attachment by Beatrice Beebe, Steven Knoblauch, Judith Rustin, and Dorienne Sorter (2005). In this book, the authors use their 10 years of collaborative work to produce an in-depth and well-constructed discussion of verbal and nonverbal forms of intersubjectivity as observed in the treatment setting and as evidenced by data generated from more mainstream child development studies. They move beyond the lack of integration between these related though often dramatically disconnected disciplines and build on infant researchers' understanding of "prereflective" caregiver-child interactions to offer a new theory of intersubjectivity that enhances our understanding of the clinical interaction with adult patients. This book is not for those therapists who are interested in learning well-specified, new interventions to use in their psychotherapy practice. It is also not suggested for those clinicians who do not have some background in psychoanalytic theory and practice. It is, however, recommended for those clinicians who work psychodynamically and are interested in developing their awareness of the nonverbal aspects of treatment and the co-construction of the therapeutic encounter. This book would also be useful to those in the field of psychotherapy research as it poses new questions about the nature of the therapeutic process and suggests the importance of examining the role that implicit, nonverbal interactions play in psychotherapy. Beebe, Knoblauch, Rustin, and Sorter's book is well constructed, persuasively argued, and highly recommended. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
129.
本研究的主要目标是在鼓励创造性思维的同时,建立一个结构化方法用于阐明产品生命周期策略。当前提倡采用适用于大多数产品的通用规则。联系“通用性”原则,与“放之四海皆准”的方法相比,本研究找出了影响产品生命终期的主要因素。研究结果可分为两个核心部分。第一,根据产品的技术特性,该方法论确定了合理的产品生命终期策略第二,为了评估和验证该方法,将产品生命终期策略的分类和当前工业实践进行了对比,开发的产品生命终期设计顾问(ELDA)软件,指导生产商确定适合的产品生命终期策略。对产品生命终期进行分类的能力使得设计者能够重新设计对环境负荷较小产品。这篇文章为设计者和生产管理者提供了合适的产品生命终期策略。通过更深入的理解相应产品的生命终期策略,本文的研究结果能够帮助设计者开发适合他们情况的、系统的产品生命终期策略。通过技术革新或者价值链的改进,将ELDA的结果运用于生命终期改善。 相似文献
130.
Burstein Marcy; Stanger Catherine; Kamon Jody; Dumenci Levent 《Canadian Metallurgical Quarterly》2006,20(2):97
A structural model accounting for child internalizing problems in substance-abusing families was tested. Parents receiving substance abuse treatment (N = 242) completed forms about children between the ages of 6 and 18 who resided in their home. The effects of parent gender, child gender, and child age were controlled. Negative parenting was examined as a mediator between parent internalizing and externalizing problems and child anxiety and affective problems using path analysis. Negative parenting mediated relations only between parent internalizing problems and child affective problems. High-positive involvement moderated relations between parent externalizing problems and child internalizing problems. Relations between parent externalizing problems and child anxiety and affective problems were significant only among families in which high-positive involvement was present. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献