The importance of cognitive processing to adjustment in the 1st year following amputation.

Objective: To describe depressive symptoms, posttraumatic stress disorder (PTSD), and posttraumatic growth at 6 and 12 months following amputation and to explore differences by demographic variables and cognitive processing of trauma. Participants: 83 adults with newly acquired limb loss. Setting: Two large metropolitan hospitals. Main Outcome Measures: The Patient Health Questionnaire depression module, PTSD Checklist, and Posttraumatic Growth Inventory. Results: Significant depressive and PTSD symptoms were reported by 15%-25% of participants. Relatively low levels of posttraumatic growth were reported. Negative cognitive processing predicted depressive and PTSD symptoms at 6 months. Positive cognitive processing predicted posttraumatic growth at 12 months. Conclusion: Cognitive processing appears to be integral to positive and negative psychosocial outcomes following amputation and should be targeted by clinical interventions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sexual revictimization prevention: An outcome evaluation.

This investigation tested a program to reduce women's risk for sexual revictimization. Participants were 66 women with histories of sexual victimization as adolescents or adults who were randomly assigned to a preventive intervention group or a no-treatment control group. They completed initial measures assessing history of sexual assault, self-efficacy, and psychological functioning, returning approximately 2 months later for follow-up assessment using the same measures. Results suggest that the prevention program may be effective in reducing the incidence of sexual assault revictimization in this population. In addition, participants in the intervention group displayed significant improvement in psychological adjustment and self-reported self-efficacy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

继承与创新:Innovasic Fido微控制器

上世纪最早出现的CISC(复杂指令集计算机)计算机结构,现又悄然兴起--Xilinx,Tensilica,Sun Microsystems和Power联盟等组织带头复兴CISC计算机结构.     

Students’ expectation,confirmation, and continuance intention to use electronic textbooks

Technology applied to education has produced numerous changes. One of these changes is the availability of electronic textbooks. However, the adoption of electronic textbooks has been slower than anticipated. This research examines adoption of electronic textbooks through studying electronic textbook users’ continuance intentions. Data for the model were collected using a survey of university students. The questionnaire was web-based and distributed using a student listserv. The sample consisted of 469 usable responses received from students who had previously used an electronic textbook. The theoretical model was analyzed using structural equations modeling and maximum likelihood estimation applied to the sample. A confirmatory factor analysis was also performed to evaluate the psychometric properties of the measures for the constructs in the theoretical model. The psychometric properties of the measures were good. The fit of the measured theoretical model to the data was also good and all the paths in the measurement and structural models were statistically significant. The structural model shows that confirmation influences perceived usefulness of electronic textbooks and satisfaction with electronic textbooks. Satisfaction and perceived usefulness of electronic textbooks influence electronic textbook continuance intention. Implications and conclusions based on these findings were also provided.     

Understanding internet recruitment via signaling theory and the elaboration likelihood model

A detailed model specifying the linkages between Internet recruitment websites and organizational attraction was examined. Participants (N = 581) viewed Fortune 500 company websites and responded to questions about the content and design of these websites and their resulting attitudes, fit perceptions, and organizational attraction. Results showed that recruitment website content and design influence attitudes toward the recruitment websites, organizational attitudes, and subsequently organizational attraction. The moderating effects of person-organization (P-O) and person-job (P-J) fit were examined. Two sets of hypotheses based on signaling theory (  and ) and the elaboration likelihood model ( Petty & Cacioppo, 1981) were largely supported. Consistent with signaling theory, the amount of job and organizational information on a recruitment website interacted with website usability, such that when less job information was presented, website usability played a greater role in predicting favorable attitudes towards the organization. Consistent with the elaboration likelihood model, when P-J fit was high, website aesthetics were less important in predicting attitudes towards the organization.     

Characterizing Discourse Among Undergraduate Researchers in an Inquiry‐Based Community of Practice

Engineering education increasingly incorporates pedagogies that promote guided, inquiry‐based, active learning within authentic “communities of practice”. Such pedagogies apply observations made about workplace interaction: that knowledge is distributed across social and physical networks. However, the process through which multiple dimensions of learning occur within a network of distributed cognition—where every person contributes to the learning of every other person—calls for further investigation. The present study, set in an active learning environment, identifies seven speech events that characterize linguistic processes of distributed cognition among undergraduate researchers in the Research Communications Studio (RCS) at the University of South Carolina. Close analysis of a small group session in the RCS revealed that participants enact critique, elicitation of critique, internalization, (direct and indirect) instruction, contextualization, explanation, and collaborative negotiation of knowledge throughout their interactions. Awareness of these speech events, which emerged from the analysis, may better equip engineering educators to optimize interactions in other active group learning environments and to facilitate such activities in more traditional pedagogical settings.     

Iron,nickel, copper,zinc and cadmium content of two cultivars of white yam (Dioscorea rotundata) and their source soils

The determination by atomic absorption spectroscopy of the iron, nickel, copper, zinc and cadmium content of two cultivars of white yam (Dioscorea rotundata Pair) and their source soil from three farms, and also of random samples of the cultivars from five geographical areas in Kaduna and Plateau states of Nigeria, is reported. The analyses show all the metals except Fe to be in trace amounts in the tissues of both cultivars; the barks contain two to four times more. The iron content was found to be about 20 times higher in the bark than in the tissue. Less than 0.7% of the metals present in the soil could be extracted with NH₄NO₃ solution. Yam bark, which contains reasonable amounts of the above metals, could be useful as cattle feed. Yam tissue, having a high content of Zn compared with Cd, could be recommended for the diet of hypertensive patients.     

用功率测量和管理工具建立低功率DSP应用

基于DSP的便携式产品设计人员所面对的一个主要难题是如何降低系统的功耗。手持系统消耗的功率越少则意味着更长的工作时间、更高的性能和更小的开销,这将使最终用户受益并有助于产品的细分。对于制造商而言,功耗问题决定其在市场上的成败。系统开发人员一直面临功率测量与管理软件开发工具的短缺,高集成度便携式系统的电源设计是令其头疼的问题。然而,DSP新开发工具为开发人员建立低功耗、高性能新系统提供了解决方案。新工具可满足两方面的应用要求:通过测量功耗来识别代码中功率密集热区;允许对内核及外设进行动态管理从而取得更高功…     

New age-linked asymmetries: Aging and the processing of familiar versus novel language on the input versus output side.

This research demonstrates 3 new age-linked asymmetries between identifying versus retrieving phonological information. Young and older adults read aloud familiar isolated words (e.g., mind) and novel pseudowords (e.g., mond) in a production task and identified lexical status for identical stimuli in a comprehension task. Young adults made fewer errors than older adults in production but not comprehension (an age-related input-output asymmetry), and they produced pseudowords but not words with fewer errors than older adults (a lexical-status asymmetry). The lexical-status asymmetry also occurred for response onset times but not for output durations (an onset-output asymmetry). All 3 asymmetries were predicted under the transmission deficit hypothesis (D. G. MacKay & D. M. Burke, 1990) but contradict theories such as general slowing that cannot explain why aging affects some types of information processing more than others. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Efficient presentation of phagocytosed cellular fragments on the major histocompatibility complex class II products of dendritic cells

Cells from the bone marrow can present peptides that are derived from tumors, transplants, and self-tissues. Here we describe how dendritic cells (DCs) process phagocytosed cell fragments onto major histocompatibility complex (MHC) class II products with unusual efficacy. This was monitored with the Y-Ae monoclonal antibody that is specific for complexes of I-Ab MHC class II presenting a peptide derived from I-Ealpha. When immature DCs from I-Ab mice were cultured for 5-20 h with activated I-E+ B blasts, either necrotic or apoptotic, the DCs produced the epitope recognized by the Y-Ae monoclonal antibody and stimulated T cells reactive with the same MHC-peptide complex. Antigen transfer was also observed with human cells, where human histocompatibility leukocyte antigen (HLA)-DRalpha includes the same peptide sequence as mouse I-Ealpha. Antigen transfer was preceded by uptake of B cell fragments into MHC class II-rich compartments. Quantitation of the amount of I-E protein in the B cell fragments revealed that phagocytosed I-E was 1-10 thousand times more efficient in generating MHC-peptide complexes than preprocessed I-E peptide. When we injected different I-E- bearing cells into C57BL/6 mice to look for a similar phenomenon in vivo, we found that short-lived migrating DCs could be processed by most of the recipient DCs in the lymph node. The consequence of antigen transfer from migratory DCs to lymph node DCs is not yet known, but we suggest that in the steady state, i.e., in the absence of stimuli for DC maturation, this transfer leads to peripheral tolerance of the T cell repertoire to self.