The study of the propagation of multiple cracks is essential to modeling and predicting structural integrity. The interaction between two cracks depends on a number of factors such as the domain geometry, the relative crack sizes and the separation between the two crack tips. In this paper, we study the interaction between two dynamically propagating cracks. We use the phase field method to track the crack paths, since this method can handle complex crack behavior such as crack branching, without any ad hoc criteria for crack evolution. The results from our dynamic simulations indicate that, unlike crack inter- action under quasi-static or fatigue loading, the presence of another crack does not accelerate crack propagation when dynamic loads are applied. However, some similarities in the crack topologies are observed for both quasi-static and dynamic loading.
In the spring of 2001 the hilly uplands immediately northwest of the modern city of Durres were for the first time investigated using the techniques of intensive surface survey. In total, an area of six square kilometers was explored and twenty-nine sites were defined, most of them new. Remains of Greek antiquity were plentiful and include unpublished inscriptions and graves. One site may be the location of a previously unknown Archaic temple. Included in this article are descriptions of the areas investigated, a list of sites, and a catalogue of the most diagnostic artifacts recovered. Patterns of settlement and land use are discussed and compared to those recorded by other surveys in Albania.
The article begins with a question about the value of revitalising the equation between sexual/intimate violence and terrorism in the current neoliberal/post-feminist political and epistemological landscape. We argue that the intensifying international interest in sexual violence, and an accompanying hyper-visual imagery, is implicated in the cauterisation of critical thought about sexual violence. We offer the more mobile and expansive concept of sexed violence to “unthink” dominant narratives that reproduce heteronormativity and white, Western hegemony. Through an analysis of the film Unwatchable, we consider why non-white raced bodies consistently materialise as less “comprehensible” as violatable than white bodies. We further suggest that a move to sexed violence can help to think more critically about both sexual violence and feminism.
In urban middle schools, educators find it challenging to meet the literacy needs of the many struggling readers in their classrooms, including language-minority (LM) learners and students from low-income backgrounds. One strategy for improving these students' reading comprehension is to teach essential academic vocabulary in a meaningful, engaging, and systematic way. This article describes the development and evaluation of an academic vocabulary curriculum for sixth-grade mainstream classrooms with large numbers of LM learners who struggle with comprehension. In a study conducted in 21 sixth-grade classrooms, the curriculum was found to be effective both in improving students' vocabulary and reading comprehension and in supporting teachers' learning about how to teach academic vocabulary. Seven universal learnings for all classrooms are described and illustrated with specific examples of activities, perspectives from teachers, and insights from students, drawn from the study.
The present study aims to advance the extant research base by evaluating the implementation and effectiveness of an academic vocabulary program designed for use in mainstream middle school classrooms with high proportions of language minority learners. The quasi-experimental, mixed-methods study was conducted in 21 classes (13 treatment matched to 8 control) in seven middle schools in a large district, with 476 sixth-grade students (346 language minority learners, 130 native English speakers). Classroom observations and teacher logs indicated the 18-week program was implemented with good fidelity and that the approach contrasted sharply with the standard district English language arts (ELA) curriculum. Multilevel modeling indicated that the program resulted in significant effects on several aspects of vocabulary knowledge, including meanings of taught words (d = 0.39; p < .0001), morphological awareness (d = 0.20; p = .0003), and the word meanings as presented in expository text (d = 0.20; p = .0227). The program also yielded marginally significant, but promising effects on a depth of word knowledge measure (d = 0.15; p =0.0830) and a norm-referenced measure of reading comprehension (d = 0.15; p = .0568). No effects were found on a norm-referenced vocabulary measure. These effects were comparable for language minority learners and their native-English-speaking classmates. Data from teachers shed light on the challenges of meeting students' diverse instructional needs and the roles of curriculum and professional networks in building instructional capacity. The findings show promise in developing effective multifaceted vocabulary instruction for implementation by ELA teachers in middle school classrooms with high numbers of language minority learners.
The alternative education field lacks a common definition and has a major divide between the differing philosophies of alternative programs; little empirical evidence is available to identify the components necessary to create effective alternative educational programs. Tremendous growth in the availability of alternative programs in the United States over the past several decades, however, illustrates continuing demand for such programs as well as the need for research on the characteristics that constitute effective alternative programs. In this article, the authors study exemplary alternative programs in 3 racially and economically diverse communities to characterize the school climate as viewed by the students and the staff. At this relatively early stage in the field of alternative education, it is essential to examine the similarities, as well as any differences, in the social climate of highly effective alternative programs and to consider their potential relationship with student academic and behavioral success. Furthermore, it is important to recognize how these findings might be one foundation for future inquiry and research on alternative education. [PUBLICATION ABSTRACT]
Lloyd C. Engelbrecht (born 1927) is Professor Emeritus of Art History at the University of Cincinnati. His article, “Wood, Plywood and Veneer, Cranbrook, the New Bauhaus and the W. P. A.: the Origins of the Eames Chair of 1946,” had its origins in a paper presented at a symposium, “Bauhaus, New Bauhaus, W. P. A.: Chairs for Mid-Century,” October 17, 1981, at the Mid-America Conference of the College Art Association, meeting in Milwaukee. The article was expanded and eventually completed in 1987, but it was never published. The author asked that his late wife, June-Marie F. Engelbrecht (1930-2009), be given credit for her immense amount of help with the research and writing of the article.
Lloyd C. Engelbrecht (born 1927) is Professor Emeritus of Art History at the University of Cincinnati. This study guide was used to illustrate some of his classroom presentations and also on-site visits with his students to Prairie School buildings. This version of the study guide dates from May 10, 1994.
Each kml file in Google Earth is labeled according to a code based upon coin attributes (type of find, coin type, material, and date). This document explains the code used for coin finds that were minted at Antioch.
Lloyd C. Engelbrecht (born 1927) is Professor Emeritus of Art History at the University of Cincinnati. In collaboration with his late wife, June-Marie F. Engelbrecht (1930-2009), he has been researching, writing about and speaking about architect and designer Henry C. Trost (1860-1933) and his family firm of Trost & Trost.
On May 8, 2014, Lloyd Engelbrecht was invited to speak at the University of Texas at El Paso as part of a Trost symposium. The following is an excerpt from the official announcement of the symposium:
In celebration of Trost’s architectural legacy, UTEP Special Collections will host the “Trost Lecture Series” at 6 p.m. May 8  in the UTEP Library, Blumberg Auditorium, room 111.
The event will feature speakers Dr. Troy Ainsworth, executive director of El Camino Real de Tierra Adentro Trail Association (CARTA); Joe and Lanna Duncan, owners of the Trost-designed El Capitan Hotel in Van Horn, Texas and El Paisano Hotel in Marfa, Texas; and Dr. Lloyd Engelbrecht, co-author of Henry C. Trost: Architect of the Southwest.
A public exhibit featuring family photos, sketches, blueprints and photographs of the buildings Trost designed in El Paso and throughout the Southwest will be on display May 10 in the UTEP Library’s atrium on the third floor.
The lecture and exhibit were part of Trost Week, May 3-10, 2014, which was organized by the Texas Trost Society, a new nonprofit group that advocates for the preservation of Trost & Trost architecture.
Lloyd C. Engelbrecht (born 1927) is Professor Emeritus of Art History at the University of Cincinnati. He is author of Moholy-Nagy: Mentor to Modernism (Cincinnati: Flying Trapeze Press, 2009), two volumes. Moholy-Nagy: Mentor to Modernism is the first comprehensive, fully documented biography of the most fully-rounded creative figure of the twentieth century.
This introductory essay was originally published in German in 2014 in the Beiheft, or supplementary volume, that accompanies the first German edition of Vision in Motion.
László Moholy-Nagy, Sehen in Bewegung, Deutsche Fassung von László Moholy-Nagys vision in motion in der Übersetzung von Herwig Engelmann [on verso of title page: “Mit einem Beiheft mit Texten von Lloyd C. Engelbrecht, Hattula Moholy-Nagy und Philipp Oswalt”]
(Leipzig: Spector Books, 2014)
László Moholy-Nagy, Vision in Motion, “id BOOK, INSTITUTE OF DESIGN” (Chicago: Paul Theobald, 1947)
A sage expression, you make the road by walking, captures the nature of accompaniment in partnership development. The purpose of this action research project was to examine the partnership of a city school and an urban university as one that engaged mutual generation of knowledge from all participants. Action research, where participants are co-equals in decision-making, enhances the co-construction of knowledge and applied practice when stakeholders work to achieve more practical goals. Two high school co-instructors and a university faculty member examined what initially brought them together – a classroom instructional need. While designing and implementing an investigation of the use of class instructional time, they simultaneously conducted a self-study action research project about the dynamics of their partnership and how to improve it. Critical interviews revealed challenges to integrating research findings into practice as well as convergent benefits of partnership development that may be relevant to partnerships of all kinds.
Key Terms: Action research, collaboration, collaborative organizations, mode 2 knowledge creation, partnership development, research-practice gap
One proactive approach to increasing student engagement in schools is implementing Positive Behavior Intervention and Support (PBIS) strategies. PBIS focuses on prevention and concentrates on quality-of-life issues that include improved academic
achievement, enhanced social competence, and safe learning and teaching environments. This study is a replication of a study that investigated the combination of active supervision, precorrection, and explicit timing. The purpose of the study was to decrease student problem behavior, reduce transition time, and support maintenance of the intervention in the setting. Results show that active supervision, precorrection, and explicit timing decreased student problem behavior, decreased the duration of transitions in two instructional periods, and the intervention was maintained in the setting. Implications, limitations, and future research are discussed.
Keywords: active supervision, explicit timing, Positive Behavior Intervention and Support, precorrection, urban education
Lloyd C. Engelbrecht (born 1927) is Professor Emeritus of Art History at the University of Cincinnati. He is author of Moholy-Nagy: Mentor to Modernism (Cincinnati: Flying Trapeze Press, 2009). He will supply addenda and corrigenda for this book on a continuing basis.
The foreground Veil of material that lies in front of the Orion Nebula is the best studied sample of the interstellar medium because we know where it is located, how it is illuminated, and the balance of thermal and magnetic energy. In this work, we present high-resolution STIS observations toward the Trapezium, with the goal of better understanding the chemistry and geometry of the two primary Veil layers, along with ionized gas along the line of sight. The most complete characterization of the rotational/vibrational column densities of H2 in the almost purely atomic components of the Veil are presented, including updates to the Cloudy model for H2 formation on grain surfaces. The observed H2 is found to correlate almost exclusively with Component B. The observed H2, observations of CI, CI*, and CI**, and theoretical calculations using Cloudy allow us to place the tightest constraints yet on the distance, density, temperature, and other physical characteristics for each cloud component. We ﬁnd the H2 excitation spectrum observed in the Veil is incompatible with a recent study that argued that the Veil was quite close to the Trapezium. The nature of a layer of ionized gas lying between the Veil and the Trapezium is characterized through the emission and absorption lines it produces, which we ﬁnd to be the blueshifted component observed in S III and P III absorption. We deduce that, within the next 30–60 thousand years, the blueshifted ionized layer and Component B will merge, which will subsequently merge with Component A in the next one million years.