Electrostatic force on the rectangular shield wall of a strip transmission line

For a strip transmission line shielded by rectangular walls,the Green‘s function is helpful to construct the variation expression of the electrostatic energy.Thomson theorem is employed to determine the charge distribution on the strip.The electrostatic force on each side of the rectangular shield wall is achieved by using the principle of virtual work.The results is easy to be obtained by computerized calculation.     

«Why do you ask?» context and communication in the conservation task

Modifications of conservation tasks designed to increase their ‘social intelligibility’ have frequently been shown to improve young children’s performance. Several studies in this area have involved introducing an emphasis on fairness of distribution, but the significance of this factor has not been independently assessed. Another factor to which attention has recently been drawn concerns the child’s understanding of the experimenter’s intentions in asking the conservation question. Perner (1984) has reported that young children responded more accurately when the question was asked by an experimenter who had not witnessed the earlier stages of the procedure. This paper reports an experiment in which these two factors — the emphasis on fairness and the introduction of a naive experimenter—were manipulated independently. One hundred and twelve 4–6 year olds were divided between four conditions and tested in pairs on a task involving conservation of discontinuous quantity. The results offered clear evidence that emphasising fairness through the device of a competitive game did increase the frequency of correct responses. The introduction of a second experimenter to ask the conservation question also had a significant, if more limited, facilitative effect. Possible social and cognitive processes underlying these results are discussed.     

构建“以人为本、三维一体”的教学质量监控体系

高等学校的根本任务是培养人才,提高教学质量是高等学校永恒的主题。"以人为本、三维一体"的教学质量闭环监控体系,采用督导、评价等监控手段与激励体系,将目标管理与过程管理相结合,实行双向反馈,进行全程、全员、全面的质量管理,极大地调动了广大教师的积极性,对于高等院校建立教学长效机制和提高教学质量具有重要作用。     

The Rhetoric of Visual Play: An Analysis of Postsubject Voice in New York City

Through an analysis of the street artist Banksy's 2013 residency of New York City, I identify two major rhetorical themes: Images of Discontent and Re-Visions of the City. I argue that the Banksy images exert an influential postsubject voice into the visual discourse of New York City, which I define as a visual articulation that resists traditional markings of identity in favor of visual play. In visual play, elements of the city are turned into toys through a critical orientation towards the urban landscape, postmodern aesthetic codes, participatory rhetoric, and the logics of the virtual. I conclude by arguing that play may offer an effective and transgressive mode of engaging contemporary rhetorical argument, particularly within the materiality of place.     

Why children join and stay in sports clubs: case studies in Australian,French and German swimming clubs

This article builds upon research on youth sport clubs conducted from a socio-cultural perspective by reporting on a study that inquired into the reasons why children aged 9–12 joined swimming clubs in France, Germany and Australia. Comprising three case studies it employed a mixed method approach with results considered within the framework of Côté and colleagues' Development Model of Sport Participation (DMSP). It identifies the importance of parents, the social dimensions of experience in the clubs and of appropriate competition in attracting the children to the clubs and keeping them there.     

Versatile on-demand droplet generation for controlled encapsulation

We present a droplet-based microfluidic system for performing bioassays requiring controlled analyte encapsulation by employing highly flexible on-demand droplet generation. On-demand droplet generation and encapsulation are achieved pneumatically using a microdispensing pump connected to a constant pressure source. The system generates single droplets to the collection route only when the pump is actuated with a designated pressure level and produces two-phase parallel flow to the waste route during the stand-by state. We analyzed the effect of actuation pressure on the stability and size of droplets and optimized conditions for generation of stable droplets over a wide pressure range. By increasing the duration of pump actuation, we could either trigger a short train of identical size droplets or generate a single larger droplet. We also investigated the methodology to control droplet contents by fine-tuning flow rates or implementing a resistance bridge between the pump and main channels. We demonstrated the integrated chip for on-demand mixing between two aqueous phases in droplets and on-demand encapsulation of Escherichia coli cells. Our unique on-demand feature for selective encapsulation is particularly appropriate for bioassays with extremely dilute samples, such as pathogens in a clinical sample, since it can significantly reduce the number of empty droplets that impede droplet collection and subsequent data analysis.     

Information-seeking behavior of basic science researchers: implications for library services

Objectives:

This study examined the information-seeking behaviors of basic science researchers to inform the development of customized library services.

Methods:

A qualitative study using semi-structured interviews was conducted on a sample of basic science researchers employed at a university medical school.

Results:

The basic science researchers used a variety of information resources ranging from popular Internet search engines to highly technical databases. They generally relied on basic keyword searching, using the simplest interface of a database or search engine. They were highly collegial, interacting primarily with coworkers in their laboratories and colleagues employed at other institutions. They made little use of traditional library services and instead performed many traditional library functions internally.

Conclusions:

Although the basic science researchers expressed a positive attitude toward the library, they did not view its resources or services as integral to their work. To maximize their use by researchers, library resources must be accessible via departmental websites. Use of library services may be increased by cultivating relationships with key departmental administrative personnel. Despite their self-sufficiency, subjects expressed a desire for centralized information about ongoing research on campus and shared resources, suggesting a role for the library in creating and managing an institutional repository.

Highlights

• Basic science researchers rely on a small network of individuals in their institution and at other institutions to satisfy their information needs.
• Basic science researchers tend to ignore institutional boundaries when searching for information and do not necessarily view the library as the primary source of scholarly information.
• Basic science researchers use the interlibrary loan service regularly but otherwise rarely use traditional library services such as mediated literature searching and instruction.

Implications

• The library must establish a presence in researchers'' work environments, rather than expect them to seek out library resources and services.
• The increased emphasis by funding agencies on clinical translational science may impact the information needs of basic science researchers in the future.
• Libraries have an opportunity to capitalize on their positive reputation and basic scientists'' desire for more centralized information to create new information resources and services such as institutional repositories.

     

Relationships among moral and contesting variables and prosocial and antisocial behavior in sport

The current study of US intercollegiate athletes (n = 1066) involved in multiple sports investigated relationships among moral (moral reasoning maturity, moral value evaluation [MVE], and moral identity), contesting (partnership and war orientations) and behavioral (prosocial and antisocial) variables in sport. Among other relationships, results demonstrated that prosocial behavior was positively correlated with moral reasoning maturity, higher appreciation of moral values, moral identity and a partnership contesting orientation. In contrast, antisocial behavior was negative correlated with moral reasoning maturity, MVE, moral identity and a partnership orientation. In addition, antisocial behavior was positively correlated with a war contesting orientation. Regression analyses demonstrated that prosocial behavior was best predicted by the partnership contesting orientation and moral identity; antisocial behavior was best predicted by the war orientation followed closely by moral identity. Results are discussed in relation to Kohlbergian moral theory and contesting theory.