数字技术,让新闻业的未来起步于现在

当前,探讨新闻业的未来是美国新闻界各种研讨会的主要话题,引起许多新闻企业高管、记者和学者的思考.有些悲观的人甚至怀疑新闻业到底有没有未来.鉴于此,在今年9月底举行的美国在线新闻协会年会不再有专门讨论“新闻的未来”的小组会议.本次年会的焦点是新闻机构和记者在当前应该拥抱的数字技术.     

There is an "I" in TEAM: narcissism and social loafing

We investigated narcissism as a moderator of social loafing on a physical performance task. High and low narcissistic individuals twice performed a cycling task in same-sex teams of three: once when identifiability was low; and once when identifiability was high. A significant interaction between narcissism and identifiability was revealed, F(1, 40) = 4.09, p < .05, eta2 = .09 for performance. Follow-up tests indicated that high narcissists' performance significantly increased with greater identifiability, whereas low narcissists displayed no such performance differences. Results suggested that this effect was due to an increase in narcissists' on-task effort (ratings of perceived exertion and heart rate) when they knew that their performance was to be identified.     

Relative importance of physiological, anthropometric, and skill qualities to team selection in professional rugby league

This study investigated the relative importance of physiological, anthropometric, and skill qualities to team selection in professional rugby league. Eighty-six high performance rugby league players underwent measurements of anthropometric (height, body mass, sum of seven skinfolds), physiological (speed, change of direction speed, lower body muscular power, repeated-sprint ability, prolonged high-intensity intermittent running ability, and maximal aerobic power), technical skill (tackling proficiency, draw and pass proficiency), and perceptual skill (reactive agility, pattern recall, pattern prediction) qualities. A linear discriminant analysis was also conducted comparing those players successful in gaining selection into the professional National Rugby League team with those not selected to determine which, if any, of these qualities could predict selection. Players selected to play in the first National Rugby League game of the season were older, more experienced, leaner, had faster 10 m and 40 m sprint times, and superior vertical jump performances, maximal aerobic power, tackling proficiency and dual-task draw and pass ability than non-selected players. Skinfold thickness and dual-task draw and pass proficiency were the only variables that contributed significantly (P < 0.05) to the discriminant analysis of selected and non-selected players. These findings suggest that selected physiological, anthropometric, and skill qualities may influence team selection in professional rugby league.     

Efficient capture of circulating tumor cells with a novel immunocytochemical microfluidic device

Ability to perform cytogenetic interrogations on circulating tumor cells (CTCs) from the blood of cancer patients is vital for progressing toward targeted, individualized treatments. CTCs are rare compared to normal (bystander) blood cells, found in ratios as low as 1:10⁹. The most successful isolation techniques have been immunocytochemical technologies that label CTCs for separation based on unique surface antigens that distinguish them from normal bystander cells. The method discussed here utilizes biotin-tagged antibodies that bind selectively to CTCs. The antibodies are introduced into a suspension of blood cells intending that only CTCs will display surface biotin molecules. Next, the cell suspension is passed through a microfluidic channel that contains about 9000 transverse, streptavidin coated posts. A CTC making contact with a post has the opportunity to engage in a biotin-streptavidin reaction that immobilizes the cell. Bystander blood cells remain in suspension and pass through the channel. The goal of the present study is to establish the technical performance of these channels as a function of antigen density and operating conditions, especially flow rate. At 18 μL/min, over 70% of cells are captured at antigen densities greater than 30 000 sites/cell while 50% of cells are captured at antigen densities greater than 10 000. It is found that lower flow rates lead to decreasing cell capture probabilities, indicating that some streamlines develop which are never close enough to a post to allow cell-post contact. Future modeling and streamline studies using computational fluid dynamics software could aid in optimization of channel performance for capture of rare cells.     

Effects of environmental novelty on filial behavior in imprinted ducklings

Environmental novelty was manipulated in imprinted ducklings by varying the illumination level of the experimental apparatus. Bright illumination disrupted filial behavior in subjects that had received little prior exposure to the imprinting object, with approach being suppressed more when the object was stationary than when it was moving. In subjects with prolonged prior imprinting exposure, bright illumination enhanced filial behavior. These effects can be understood if one assumes that environmental novelty has an energization effect while also eliciting responses that are incompatible with filial behavior.     

Dimensions of utilization and types of evaluation approaches

The growing interest in program evaluation is related to the various uses that such studies are expected to serve, including: influencing budget decisions, serving as a medium of accountability, facilitating policymaking, and guiding managerial decisions regarding program design and delivery. There are also some uses which are not generally publicly acknowledge such as: to whitewash programs, to purposefully destroy them, and to postpone needed action.The need for understanding various interpretations of utilization is reflected in the different conclusions that writers have drawn about the extent to which evaluation findings are utilized. Those who claim that evaluation findings have not been utilized tend to view utilization as the immediate and direct use of evaluation findings for decisionmaking. On the other hand, those who view utilization as having more modest uses (e.g., prodding action or providing added assurance) tend to produce evidence that program evaluation has been widely utilized in decision making.This paper will examine utilization primarily from the viewpoint of decisionmaking. This focus will serve as the basis for demonstrating how the meaning of utilization differs according to the purpose(s) and methodology of the evaluation study conducted.     

Dream the Impossible Dream: A Case Study of U.S. Federal Website Accessibility Standards Compliance at Seton Hall University Libraries

This case study examines the process of meeting Web Accessibility compliance in a United States academic library for a medium sized University. This process was prompted by the Office of Civil Rights in the Department of Education, and resulted in the execution of a Voluntary Resolution Agreement (VRA). In addition to the process the author describes what a VRA is and the common component parts therein.     

Teaching historical contextualization: the construction of a reliable observation instrument

Since the 1970s, many observation instruments have been constructed to map teachers’ general pedagogic competencies. However, few of these instruments focus on teachers’ subject-specific competencies. This study presents the development of the Framework for Analyzing the Teaching of Historical Contextualization (FAT-HC). This high-inference observation instrument focuses on history teachers’ competency in promoting historical contextualization in classrooms. The results of the study demonstrate the instrument’s content validity. Generalizability studies were conducted to further assess the instrument’s dimensionality and reliability by decomposing the instrument’s variance. A large proportion of the variance was explained by differences between observed teachers, and a small proportion of the variance was explained by lessons and observers, demonstrating the instrument’s reliability. Furthermore, a decision study was conducted to determine the optimal number of observers and lessons needed for a reliable scoring design. The developed instrument could be used to gain greater insight into history teachers’ subject-specific competencies and to focus teacher professionalization on teachers’ specific needs.