725 research outputs found
A Survey of Digital Systems Curriculum and Pedagogy in Electrical and Computer Engineering Programs
Digital Systems is one of the basic foundational courses in Electrical and Computer Engineering. One of the challenges in designing and modifying the curriculum for the course is the fast pace of technology change in the area. TTL chips that were in vogue with students building physical circuits, have given way to new paradigms like FPGA based synthesis with hardware description languages such as VHDL. However, updating a course is not as simple as just changing the book, and changing the syllabus. A large amount of work needs to be done in terms of selecting the book that will accommodate the course, the device that should be used, the laboratory content, and even how much time needs to be dedicated for every topic. All these issues, and many more makes it hard to take the decision of updating the course. For that reason, this paper surveys the pedagogy and methodology that is used to teach the digital systems curriculum at different universities. The goal is that it will serve as a resource for faculty looking to update or revamp their digital systems curricula. Within the document they will find a comparative study by electrical and computer engineering program, a list of textbooks, and the devices most commonly used.Cockrell School of Engineerin
Role of non-timber forest products in sustaining forest-based livelihoods and rural households' resilience capacity in and around protected area- a Bangladesh study
People in developing world derive a significant part of their livelihoods
from various forest products, particularly non-timber forest products. This
article attempts to explore the contribution of NTFPs in sustaining
forest-based rural livelihood in and around a protected area of Bangladesh, and
their potential role in enhancing households resilience capacity. Based on
empirical investigation our study revealed that, local communities gather a
substantial amount of NTFPs from national park despite the official
restrictions. 27 percent households of the area received at least some cash
benefit from the collection, processing and selling of NTFPs, and NTFPs
contribute as HHs primary, supplementary and emergency sources of income. NTFPs
also constituted an estimated 19 percent of HHs net annual income, and were the
primary occupation for about 18 percent of the HHs. HHs dependency on nearby
forests for various NTFPs varied vis-a-vis their socio-economic condition as
well as with their location from the park. Based on our case study the article
also offers some clues for improving the situation in PA.Comment: To appear in Journal of Environmental Planning and Management, 201
Removal of congo red dye from water using carbon slurry waste
A cheaper adsorbent has been prepared from carbon slurry waste obtained from National Fertilizer Limited (NFL), Panipat and investigated for the removal of congo red, an anionic dye. Its adsorption on prepared carbonaceous adsorbent was studied as a function of contact time, concentration and temperature. The results have shown that carbonaceous adsorbent adsorbs dye to a sufficient extent (272mgg-1). A comparative study of adsorption results with those obtained on activated charcoal shows that the carbonaceous adsorbent is ~95% efficient as compared to activated charcoal. Thus, it can be fruitfully used for the removal of dyes from wastewater
Analysis of dynamic stall development on a cross-flow turbine blade
This research computationally investigates the complex dynamic stall
phenomena of a cross-flow turbine blade utilizing modal analysis to identify
pertinent events within the cycle. The blade rotation perpendicular to the
freestream generates a curved relative flow, a non-sinusoidal variation of
relative flow speed and angle of attack, and the necessity of travelling
through its own wake. These complexities have challenged traditional predictors
of dynamic stall such as pitch rate, pitching moment, or relative angle of
attack. To investigate these phenomena, aerodynamic loads and flow fields on
the blade from large-eddy simulations are examined across two tip speed ratios.
Proper orthogonal decomposition of the velocity fields is employed to analyze
the spatio-temporal evolution of the dominant flow features. The modes' time
development coefficients reveal a stronger representation of the flow at the
higher rotation rate, capturing the trend of relative flow velocity magnitude
and lift generation on the blade, along with critical events such as vortex
formation and detachment. Additionally, mean power generation is enhanced by
40\% by applying a non-constant rotation rate (intracycle control or angular
velocity control). The flow fields, supported by corresponding changes in the
modal analysis, demonstrate that a delayed stall behavior is responsible for
the additional power extraction. Finally, flow curvature, history effects, and
induced flow are identified as significant factors that modify the dynamic
stall onset and resulting force and moment curves as compared to non-rotating
pitching or plunging foils
Communities in conservation: Protected area management and enhanced conservation in Bangladesh
In the last few decades, the natural resource base of most developing countries has decreased alarmingly because of enormous population pressure and extreme poverty. Bangladesh is no exception, having lost most of its forest in the last 30 years. The Government of Bangladesh (GoB) has adopted various approaches to conserve the country’s remaining biodiversity, including protected areas (PAs). However, the creation of PAs alone has not produced positive conservation results as expected, due to a purely ecological focus that excluded the needs of local forestdependent people. The introduction of community-based natural resource management (CBNRM) for nature conservation in PAs is relatively new for Bangladesh compared to other South Asian countries, but it seems to have effected significant changes. The GoB recently adopted CBNRM in five of its PAs as part of a pilot programme in collaborative management. This paper is a case study of the changing trends in PA management, people’s livelihoods and attitudes in and around one of these pilot sites. We observed that some changes have already taken place in forest resource collection patterns and in the attitudes of people in the locality. People’s income sources and dependency on protected forests have also noticeably shifted away from forest areas in the Communities in conservation: protected area management and enhanced conservation in Bangladesh last year. Although gradual, people’s participation seems to be changing the direction of future forest conservation in Bangladesh. We conclude that bringing a larger number of people under various income-generating schemes, clearly defining the rights and responsibilities of the local people in PAs and ensuring more effective governance should be the next steps for the future of participatory management in the country
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