Optimization of Photovoltaic/Thermal Collectors

Author(s):  
Joseph McCabe

Recent designs in the Solar Decathlon have incorporated solar electric modules with heat capture. Zero Energy Buildings (ZEB) solicitations through the National Renewable Energy Laboratory (NREL) have recently awarded photovoltaic / thermal (PV/T) projects incorporating air and fluid based heat transfer mediums. This paper introduces the PV/T collector with a quick history of four different research and development projects starting with the Massachusetts Institute of Technology (MIT) in 1978. Suggestions for engineering design and performance guidelines are provided. A demonstration of a zero glazed thin film amorphous silicon photovoltaic module with air as the fluid transfer medium, captured off the backside, is presented. The paper provides suggestions on applications and appropriate environments for various PV/T collector types.

Author(s):  
John Wang ◽  
James Yao ◽  
Jeffrey Hsu

Over the four decades of its history, decision support systems (DSSs) have moved from a radical movement that changed the way information systems were perceived in business, to a mainstream commercial information technology movement that all organizations engage. This interactive, flexible, and adaptable computer-based information system derives from two main areas of research: the theoretical studies of organizational decision making done at the Carnegie Institute in the 1950s and early 1960s as well as the technical work on interactive computer systems which was mainly performed by the Massachusetts Institute of Technology (Keen & Morton, 1978). DSSs began due to the importance of formalizing a record of ideas, people, systems, and technologies implicated in this sector of applied information technology. But the history of this system is not precise due to the many individuals involved in different stages of DSSs and various industries while claiming to be pioneers of the system (Arnott & Pervan, 2005; Power, 2003). DSSs have become very sophisticated and stylish since these pioneers began their research. Many new systems have expanded the frontiers established by these pioneers yet the core and basis of the system remains the same. Today, DSSs are used in the finance, accounting, marketing, medical, as well as many other fields.


Author(s):  
Steven Brint ◽  
Jerome Karabel

No analysis of the history of the community college movement in Massachusetts can begin without a discussion of some of the peculiar features of higher education in that state. Indeed, the development of all public colleges in Massachusetts was, for many years, inhibited by the strength of the state’s private institutions (Lustberg 1979, Murphy 1974, Stafford 1980). The Protestant establishment had strong traditional ties to elite colleges—such as Harvard, Massachusetts Institute of Technology, Williams, and Amherst—and the Catholic middle class felt equally strong bonds to the two Jesuit institutions in the state: Boston College and Holy Cross (Jencks and Riesman 1968, p. 263). If they had gone to college at all, most of Massachusetts’s state legislators had done so in the private system. Private college loyalties were not the only reasons for opposition to public higher education. Increased state spending for any purpose was often an anathema to many Republican legislators, and even most urban “machine” Democrats were unwilling to spend state dollars where the private sector appeared to work well enough (Stafford and Lustberg 1978). As late as 1950, the commonwealth’s public higher education sector served fewer than ten thousand students, just over 10 percent of total state enrollments in higher education. In 1960, public enrollment had grown to only 16 percent of the total, at a time when 59 percent of college students nationwide were enrolled in public institutions (Stafford and Lustberg 1978, p. 12). Indeed, the public sector did not reach parity with the private sector until the 1980s. Of the 15,945 students enrolled in Massachusetts public higher education in 1960, well over 95 percent were in-state students. The private schools, by contrast, cast a broader net: of the nearly 83,000 students enrolled in the private schools, more than 40 percent were from out of state (Organization for Social and Technical Innovation 1973). The opposition to public higher education began to recede in the late 1950s. Already by mid-decade, a large number of urban liberals had become members of the state legislature, and a new governor, Foster Furcolo, had been elected in 1956 on an activist platform.


Author(s):  
Tara H. Abraham

Warren S. McCulloch (1898-1969) has become an icon of the American cybernetics movement and of current work in the cognitive neurosciences. Much of this legacy stems from his classic 1943 work with Walter Pitts on the logic of neural networks, and from his colourful role as chairman of the Macy Conferences on Cybernetics (1946-1953). This biographical work looks beyond McCulloch’s iconic status by exploring the varied scientific, personal, and institutional contexts of McCulloch’s life. By doing so, the book presents McCulloch as a transdisciplinary investigator who took on many scientific identities beyond that of a cybernetician: scientific philosopher, neurophysiologist, psychiatrist, poet, mentor-collaborator, and engineer, and finally, his public persona towards the end of his life, the rebel genius. The book argues that these identities were neither products of McCulloch’s own will nor were they simply shaped by his institutional contexts. In integrating context and agency, the book as provides a more nuanced and rich understanding of McCulloch’s role in the history of American science as well as the institutional contexts of scientific investigations of the brain and mind: in particular at Yale University, the University of Illinois at Chicago, and the Massachusetts Institute of Technology. The book argues that one of McCulloch’s most important contributions was opening up new ways of understanding the brain: no longer simply an object of medical investigation, the brain became the centre of the multidisciplinary neurosciences.


2021 ◽  
Vol 61 (4) ◽  
pp. 534-545
Author(s):  
Carroll Pursell ◽  
Toru Iiyoshi

AbstractThe rise of online learning over the past few decades has raised fundamental questions about the kinds of “spaces” and “places” this mode of education creates. Do they support meaningful exchanges? Can they advance educational equity, access, and community-building? Are they comparable to in-person classroom experiences? The recent COVID pandemic and the global turn toward virtual learning in response have brought such questions into sharp relief. These were the questions and contextual factors that brought distinguished historian Carroll Pursell and international educational technology authority Toru Iiyoshi together for this policy dialogue. Their conversation takes readers on a wide-ranging discussion about the interplay between education, technology, and society writ large. And they offer insights into the past, present, and likely future of education in an era of accelerating technological change.Carroll Pursell is the Adeline Barry Davee Distinguished Professor of History (Emeritus) at Case Western Reserve University and Distinguished Honorary Professor of History at the Australian National University. He held faculty positions at the University of California at Santa Barbara and served as the Andrew W. Mellon Distinguished Professor of the Humanities at Lehigh University. Pursell is a fellow of the American Association for the Advancement of Science (AAAS), and former president of both the International Committee for the History of Technology (ICOHTEC) and the Society for the History of Technology (SHOT), which also awarded him its Leonardo da Vinci Medal for outstanding contributions to the history of technology.Toru Iiyoshi is professor and director at the Center for the Promotion of Excellence in Higher Education at Kyoto University. Previously, he was a senior scholar and director of the Knowledge Media Laboratory at the Carnegie Foundation for the Advancement of Teaching. He also served as senior strategist in the Office of Educational Innovation and Technology at Massachusetts Institute of Technology. Iiyoshi is a member of the World Economic Forum's Global Agenda Council on Technology and Education and past recipient of the Outstanding Practice Award in Instructional Development and the Robert M. Gagne Award for Research in Instructional Design from the Association for Educational Communications and Technology.HEQ Policy Dialogues are, by design, intended to promote an informal, free exchange of ideas between scholars. At the end of the exchange, we offer a list of references to readers who wish to follow up on sources relevant to the discussion.


Author(s):  
H. M. Mazzone

Chromosome banding procedures commonly employ treatment steps in order to visualize the bands. In various cases, band-positive regions of chromosomes are observed after the latter are exposed to, e.g., acids, bases, salts, heat, or enzymes. Recently, mouse chromosomes treated with the antibiotic actinomysin D and the dye acridine orange demonstrated high resolution G-banding patterns by light microscopy. However, occasionally, banding can be produced with little or no treatment of the chromosomes. The present report describes the presence of bands in chromosomes of cultured cells whereby no treatment steps, as noted above, were employed. It is interesting that the history of the cells included their transformation by polyoma virus.Maintenance of virus-transformed Syrian hamster cell lines and their examination in the transmission electron microscope (TEM) was done in the Department of Biology of the Massachusetts Institute of Technology.


2014 ◽  
Vol 52 (1) ◽  
pp. 236-237

Anne L. Murphy of University of Hertfordshire reviews, “Prometheus Shackled: Goldsmith Banks and England's Financial Revolution after 1700” by Peter Temin and Hans-Joachim Voth. The Econlit abstract of this book begins: “Explores the history of goldsmith banks and their role in the growth of England's economy after 1700. Discusses earning and spending in eighteenth-century London; the financial revolution; goldsmith banks; borrowers, investors, and usury laws; the South Sea Bubble; the triumph of boring banking; and finance and slow growth during the Industrial Revolution. Temin is Elisha Gray II Professor Emeritus of Economics at the Massachusetts Institute of Technology. Voth is ICREA Research Professor at the Universitat Pompeu Fabra.”


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