Science and Technology Studies Commons^™

Behaviour Of Hollow Core Square Reinforced Concrete Columns Wrapped With Cfrp With Different Fibre Orientations, Muhammad N. Hadi, T D. Le

Faculty of Engineering and Information Sciences - Papers

Results of testing twelve hollow core square reinforced concrete columns wrapped with Carbon fibre 33 reinforced polymer (CFRP) are presented. The effect of fibre orientation on the performance of specimens 34 under concentric and eccentric loads was investigated. Twelve specimens were divided into four groups with three 36 specimens each. The specimens in the first reference group were unwrapped, while the specimens in the 37 remaining groups were wrapped with CFRP of different wrap combinations of three fibre orientations.The specimens in each group were tested 39 under three eccentricities: 0 (concentric), 25, and 50 mm up to failure. Test ...

Kms States On C* - Algebras Associated To Higher-Rank Graphs, Astrid An Huef, Marcelo Laca, Iain Raeburn, Aidan Sims

Faculty of Engineering and Information Sciences - Papers

Consider a higher rank graph of rank k. Both the Cuntz-Krieger algebra and Toeplitz-Cuntz-Krieger algebra of the graph carry natural gauge actions of the torus Tk, and restricting these guage actions to one parameter subgroups of Tk gives dynamical systems involving actions of the real line. We study the KMS states of these dynamical systems. We find that for large inverse temperatures B, the simplex of KMS B states of the Toeplitz-Cuntz-Krieger algebra has dimension d one less than the number of vertices in the graph. We also show that there is a preferred dynamics for which there is a ...

Dem Simulation Of The Behaviour Of Geogrid Stabilised Ballast Fouled With Coal, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers

Geogrids are commonly used in railway construction for reinforcement and stabilisation. When railway ballast becomes fouled due to ballast breakage, infiltration of coal fines, dust and subgrade soil pumping, the reinforcement effect of geogrids decreases significantly. This paper presents results obtained from Discrete Element Method (DEM) to study the interface behaviour of coal-fouled ballast reinforced by geogrid subjected to direct shear testing. In this study, irregularly-shaped aggregates (ballast) were modelled by clumping together 10-20 spheres in appropriate sizes and positions. The geogrid was modelled by bonding a large number of small spheres together to form the desired grid geometry and ...

Coupled Hydro-Geochemical Modelling Of A Permeable Reactive Barrier For Treating Acidic Groundwater, Buddhima Indraratna, Punyama Pathirage, Kerry Rowe, Laura Banasiak

Faculty of Engineering and Information Sciences - Papers

This study focuses on coupling geochemistry with geo-hydraulics to enable time-dependent modelling of the remediation of acidic groundwater using an alkaline permeable reactive barrier (PRB). Chemical clogging due to secondary mineral precipitates reduces the porosity and hydraulic conductivity of the reactive medium. The governing equations are incorporated into commercial numerical codes, MODFLOW and RT3D. An original algorithm was developed for RT3D to simulate geochemical reactions occurring in the PRB. The results and the model predictions are in agreement, confirming that the hydraulic conductivity reduction due to mineral precipitation occurs at the start of permeation and continues until halfway through the ...

The Path Space Of A Directed Graph, Samuel B. G Webster

Faculty of Engineering and Information Sciences - Papers

We construct a locally compact Hausdorff topology on the path space of a directed graph E and identify its boundary-path space ∂E as the spectrum of a commutative C*-subalgebra DE of C*(E). We then show that ∂E is homeomorphic to a subset of the infinite-path space of any desingularisation F of E. Drinen and Tomforde showed that we can realise C*(E) as a full corner of C*(F), and we deduce that DE is isomorphic to a corner of DF. Lastly, we show that this isomorphism implements the homeomorphism between the boundary-path spaces.

Being Social, Going Global, Ali Symons

Journal of Professional Communication

This critical review compares two books that predict the future of global connectivity: The New Digital Age: Reshaping the Future of People, Nations, and Businesses (Knopf, 2013, 336 pages) and Rewire: Digital Cosmopolitans in the Age of Connection (W.W. Norton, 2013, 312 pages). The reviewer contrasts the pragmatic approach of The New Digital Age, which describes the current reality of political connection, and the more idealistic Rewire, which calls individuals to embrace global connectivity for the sake of innovation. The reviewer determines that both perspectives offer an essential reminder to communications professionals: unprecedented opportunities and challenges will arise as ...

Information And Communication Technologies And The Digital Divide In Africa: A Review Of The Periodical Literature, 2000-2012, Susan E. Russell, Tom Steele

Electronic Journal of Africana Bibliography

The digital revolution has transformed much of the global economy. Information and communication technologies (ICTs) play a key role in this revolution. However, not everyone has equal access to these technologies. This gap exists on multiple levels, whether between individuals, small segments within a population, countries, or global regions. The term used to refer to this inequality is the digital divide. This bibliography focuses on recent literature written to describe the digital divide on the African continent.

Wireless Networks: Technological Challenges And Policy Implications, Christopher S. Yoo

Faculty Scholarship

Since June 2012, mobile wireless has emerged as the largest and fast growing medium for broadband service. At the same time, mobile wireless networks have proven considerably more difficult to manage than wireline networks. The primary causes are the rapid growth in demand for wireless bandwidth and the greater susceptibility of wireless networks to poor quality of service because of the omnidirectional propagation of wireless signals, bad handoffs, local congestion, and the susceptibility to complex interference patterns caused by multipath propagation. Moreover, the central inference underlying the primary form of congestion management is not valid for wireless networks. As a ...

Patent Value And Citations: Creative Destruction Or Strategic Disruption?, David S. Abrams, Ufuk Akcigit, Jillian Popadak

Faculty Scholarship

Prior work suggests that more valuable patents are cited more and this view has become standard in the empirical innovation literature. Using an NPE-derived dataset with patent-specific revenues we find that the relationship of citations to value in fact forms an inverted-U, with fewer citations at the high end of value than in the middle. Since the value of patents is concentrated in those at the high end, this is a challenge to both the empirical literature and the intuition behind it. We attempt to explain this relationship with a simple model of innovation, allowing for both productive and strategic ...

Mitigation Of Rooftop Solar Pv Impacts And Evening Peak Support By Managing Available Capacity Of Distributed Energy Storage Systems, Mohammed J. Alam, Kashem Muttaqi, Darmawan Sutanto

Faculty of Engineering and Information Sciences - Papers

A high penetration of rooftop solar photovoltaic (PV) resources into low-voltage (LV) distribution networks creates reverse power-flow and voltage-rise problems. This generally occurs when the generation from PV resources substantially exceeds the load demand during high insolation period. This paper has investigated the solar PV impacts and developed a mitigation strategy by an effective use of distributed energy storage systems integrated with solar PV units in LV networks. The storage is used to consume surplus solar PV power locally during PV peak, and the stored energy is utilized in the evening for the peak-load support. A charging/discharging control strategy ...

Flight Energy Management Training: Promoting Safety And Efficiency, Juan R. Merkt

Journal of Aviation Technology and Engineering

Poor aircraft energy management can lead to unsafe and inefficient operations. Despite their impact on safety and economy, energy management skills are not adequately taught or evaluated in civilian pilot training. This paper 1) addresses the need for better energy management training, 2) provides a conceptual and pedagogical framework for later curriculum development, and 3) suggests key attributes of an effective training program. To make the case, the study uses energy management to link safety and efficiency. It then synthesizes energy principles across disciplines and illustrates how such principles, once simplified, become powerful instructional tools. Finally, it suggests that an ...

Flight Skill Proficiency Issues In Instrument Approach Accidents, Richard O. Fanjoy, Julius C. Keller

Journal of Aviation Technology and Engineering

Despite procedural modifications and advanced technology instrumentation, instrument approach phase accidents continue to be an issue in general aviation. This exploratory study details an analysis of instrument approach phase accidents that occurred between 2002 and 2012. Particular attention was focused on instrument proficiency check (IPC) currency for pilots involved in accidents during the approach phase of flight. An analysis suggests that more than half of instrument approach accidents evaluated during this study happened within three and half months of the last IPC. A leading cause of these accidents was failure to control the aircraft. Instrument training issues and potential follow-on ...

Measuring Intensity Of Laser Light Penetrating Flight Decks In Laser Illuminations, Randal J. Demik, Stanley Harriman, Ryan S. Phillips, Charles Crowder, Jennifer A. Pfeifer, Shane F. Mchugh, Steven J. Foster, Elizabeth R. De Waard, Michael Streit, Richard B. Antoniolli, Ernest W. Knight, David S. York, Jacob Luedtke

Journal of Aviation Technology and Engineering

Since 2005, reported laser attacks from people on the ground directed towards arriving and departing aircraft have increased over 300%. A laser aimed at the windshield of an aircraft startles a pilot and may cause injury. This study determined empirical evidence of laser intensity in the flight deck and the potential for harm to the human eye at various distances. Results of this study revealed that relatively low-powered lasers had measured intensity levels through cockpit windshields at the 200 and 500 feet distances that may cause damage to crewmembers’ eyes according to standards established by the federal government. At longer ...

Conversion Of Greenhouse Gasses Into Energy, Sarah C. Rippe

Social Sciences

No abstract provided.

A New Hybrid Reality For Libraries, Pin Pin Yeo

Research Collection Library

Parag Khanna explored the different trends that have brought us to what he terms the “Hybrid Age”, which is digital, global, and as well as social. Libraries continue to play an important role in this because they are uniquely positioned.

The Taxation Of Cloud Computing And Digital Content, David Shakow

Faculty Scholarship

“Cloud computing” raises important and difficult questions in state tax law, and for Federal taxes, particularly in the foreign tax area. As cloud computing solutions are adopted by businesses, items we view as tangible are transformed into digital products. In this article, I will describe the problems cloud computing poses for tax systems. I will show how current law is applied to cloud computing and will identify the difficulties current approaches face as they are applied to this developing technology.

My primary interest is how Federal tax law applies to cloud computing, particularly as the new technology affects international transactions ...

Assistive Technology (At): Opportunities For Interdisciplinary Research, Education, And Service Delivery, Alkim Akyurtlu, Deirdra Murphy, Alexandra Bonardi, Tom Mercier, Craig Armiento

UMass Center for Clinical and Translational Science Research Retreat

The World Health Organization has estimated that 10% of the world’s population (650 million people) has a disability. Assistive Technology (AT) has the potential to improve function for individuals with disabilities. Research and development must to focus both on universal design approaches for the population, as well as customization to meet individual functional demands. This mini-symposium will present the trends driving the need for AT, case studies demonstrating solutions to functional challenges, and evidence-based policy measures that are being implemented to meet the needs of people with disabilities living in the community.

Since 1991, UMass Lowell has operated an ...

The Effects Of Parallax Scrolling On User Experience And Preference In Web Design, Dede M. Frederick

Department of Computer Graphics Technology Degree Theses

Parallax scrolling is becoming an increasingly popular strategy in web design. In addition to its ability to engage users with a website, advocates of the technique argue that it also improves the overall user experience. This study was therefore conducted to investigate whether parallax scrolling can support these claims.

Researchers have attributed a pleasurable user experience to the fulfillment of the following variables: usability, satisfaction, enjoyment, fun and visual appeal. The goal of this study was to establish whether or not parallax scrolling can influence these variables and subsequently the user experience.

Eighty six individuals were randomly selected and assigned ...

The Umass Boston Bachelors Of Science In Information Technology, Deborah Boisvert, Ricardo Checchi, William Campbell, Jean-Pierre Kuilboer, Roger Blake, Robert Cohen, Oscar Gutierrez

Office of Community Partnerships Posters

The BSIT is a 21st Century degree that supports and extends the BATEC vision of curriculum – advanced in content and pedagogy, regionally-coordinated, and industry-linked. Every exercise assigned throughout the BSIT emphasizes collaboration, competence, and outcomes assessment. Faculty and business partners regularly participate in professional and curriculum development to ensure the program’s continued industry relevance.

Gendered Jobs And The New Gender Gap, George K. Thiruvathukal, Jon Ross

Computer Science: Faculty Publications & Other Works

This presentation discusses how to address 21st Century employment challenges by dismantling gender-specific barriers to entry. We take an interdisciplinary approach by focusing on areas such as education, public policy, culture, and media (among others).