Simplified nonlinear analysis to compute neutral axis depth in prestressed concrete rectangular beams

Recent research in concrete analysis and design has revealed that the shear capacity contributed by concrete correlates well with the neutral axis depth. While nonlinear analysis calculation of the neutral axis depth is trivial for reinforced concrete beams, it is iterative for prestressed concrete beams and does not lend itself to straightforward hand calculations. In this study, a program is developed to simulate the response of prestressed concrete rectangular sections subjected to monotonic bending taking into account cracking, yielding and ultimate states. This program is used to benchmark a simplified analytical procedure devised to perform the same task by hand. Accordingly, critical observations made to a large pool of experimental and analytical results reveal that the moment-curvature and moment-extreme fiber strain can be accurately modeled as trilinear relationships. The four key points that define the trilinear functions (initial, cracking, yielding and ultimate) may be computed analytically from simple equations derived based on consistent assumptions with the true behavior. Once the simplified analysis is performed, the computation of the neutral axis depth becomes a simple hand calculation. A parametric study was performed to further simplify the analytical procedure by computing the four key points that define the trilinear functions through linear relationships that were derived based on regression analysis of a large number of beam solutions. The neutral axis depth was calculated using the analytical and the simplified procedures for three beams with different ratios of prestressing steel and concrete strength. The results compared well with the iterative numerical procedure.     

Do charismatic presidents influence college applications and alumni donations? Organizational identity and performance in US higher education

The effect of charismatic leadership on organizational performance is contested. Yet despite the lack of consistent evidence of the value of charismatic leadership to organizations, presidential searches have increasingly favored charismatic candidates. This study shows how organizational identity mediates the relationship between charismatic leadership and organizational performance. Among religious colleges, but not among private colleges considered overall, there is a positive relationship between presidents’ charismatic leadership and the number of applications for enrollment and the amount of financial donations colleges receive. This suggests that among organizations with atypical identities, charismatic leadership can be interpreted as a meaningful signal of organizational performance.     

Being a Stranger and the Strangeness of Being: Joseph Conrad’s ‘The secret sharer’ as an allegory of being in education

Abstract

Joseph Conrad’s ‘The secret sharer’ has often been associated with what can be called initiation stories. However, in this article I argue that Conrad’s text is more than that. It can, I suggest, be read as an allegory of the inaccessibility to reveal the essence of being in command, being in education, and also the inaccessibility of the essence of the meaning of the text itself. It keeps its secret by allegorically staging alternative readings. This inaccessibility gives rise to a feeling of strangeness, of the uncanny, that must be faced in order to pass through the initiation into the unknown that all the possible allegorical meanings of the text produce. In other words, ‘The secret sharer’ has an educational value that goes beyond the act of merely using it to exemplify a certain type of initiation. In this way I connect Conrad’s text to the themes of strangeness and the stranger and show how they mutually can involve a reading of education and literature as two distinct discourses of learning.     

CATHOLICS IN THE REA, 1903–1953

This article describes the involvement of Roman Catholics in the Religious Education Association during the first 50 years of its existence. It examines attitudes of Protestants toward Catholics expressed in journal articles, convention speeches, and archival material. It presents the contributions of Roman Catholics at conventions and in journal articles during this period. The article contends that Roman Catholics deepened involvement in the REA went a long way to making the association a multifaith organization. The history also documents changes in Roman Catholic viewpoints and emphases over the period of these 50 years from an exclusive concern with schooling to a broader view of the educational mission of the church and from education in an authoritarian and dogmatic spirit to one slightly more open to outside influences and cautiously willing to cooperate with other religious groups.     

Tempest, Arizona: Criminal Epistemologies and the Rhetorical Possibilities of Raza Studies

This essay looks at Ethnic Studies activism in Arizona through a rhetorical lens in order to highlight epistemological aspects of activities such as a high school Chicano Literature class, Roberto “Dr. Cintli” Rodriguez’s journalism, and student activism to defend the Mexican-American Studies Department. Taking rhetoric’s premise that language is at the center of knowledge construction (epistemology), this essay turns to Chicano activism as a language that produces knowledge differently. The participation of students, particularly in the indigenous spiritual runs, is an important example of the traditionally central role of students to the field of Chicano Studies. Runs also work inwardly to strengthen participants and build group cohesion. These practices, like Chicano and Ethnic Studies in general, constitute a critical dialectical way of thinking, a disruptive opposition to traditional rationalities that tend to gloss over colonialist histories and justify status quo racial inequalities. Thinking about these activities rhetorically allows readers to understand how the participants communicate with a wider audience and how they generate knowledge uniquely around Chicano Studies.     

Participation in health through the construction of encounters: a micropolitical approach

We assume that the construction of encounters that produce care is a participative practice in health. Drawing on different research that has explored care production from a micropolitical approach, we present a view of participation as embedded in everyday life and based on the construction of encounters and relationships. Our goal is to provide reflections for debate on participatory practice within different frames of action. Based on the analysis of different cartographic narratives generated by research on a reproductive health policy, we discuss some core elements for the construction of encounters that produce care. On the same lines as models of professional development based on professionals’ day-to-day experiences, we propose experimentation during the encounters and discussion about what happens in them, as both a reflective practices and forms of collective and participative knowledge production.     

Man vs. Machine: A Junior‐Level Laboratory Exercise Comparing Human and Instrumental Detection Limits

The human nose is a very sensitive detector and is able to detect potent aroma compounds down to low ng/L levels. These levels are often below detection limits of analytical instrumentation. The following laboratory exercise is designed to compare instrumental and human methods for the detection of volatile odor active compounds. Reference standards of 3‐mercapto‐1‐hexanol (3MH), a secondary thiol that is important to food quality, are analyzed by gas chromatography with flame ionization detection (GC‐FID), and these raw data are provided to students. Students also perform a series of 3‐alternative forced choice (3‐AFC) sensory tests to determine the human detection limits in a series of samples. For both data sets, 2 methods of data analysis (standard deviation of the response and the slope and signal‐to‐noise ratio for GC‐FID data; forced‐choice ascending concentration series method of limits and linear regression for 3‐AFC data) will be used to estimate instrumental detection limits and human thresholds. GC‐FID and 3‐AFC results are then compared by the students to demonstrate the importance of instrumental and human methods for food analysis, and to provide an experiential learning opportunity to critically think through multiple methods of analysis and compare the outcomes of those methods. In completing the laboratory exercise and discussion questions, students will gain an understanding of the advantages and disadvantages of human and instrumental measurements in food analysis, and compare the outcome of common data analysis methods for instrumental and sensory data.     

协调劳动力的教育与培训

非常高兴在这里作演讲,而且在这里我想向会议的主办方,并向中国的联合国相关机构表示感谢!我来自联合国教科文组织亚太地区教育局,该