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Influence of Mica Content on Shear Strength, Shear Modulus, and Damping Response of Micaceous Sand
No full textIn the current study, a series of unconsolidated undrained triaxial tests, consolidated undrained triaxial tests, bender element tests, and cyclic triaxial tests were performed on micaceous sand specimens at different mica contents (0 to 30%). All the specimens were prepared at 95% maximum dry density of their respective mica-sand combinations to simulate the soil mass conditions in railway/road embankments. The experimental results showed a large reduction in the angle of internal friction as mica content increased from 0 to 30% in unconsolidated undrained tests (total stress). Consolidated undrained triaxial testing reported the decrease in shear strength with the increase in mica content (effective stress). A large decrease in shear modulus was observed with the increase in mica content from 0 to 30% in cyclic triaxial testing. The damping ratio increased with the increase in mica content. The small strain shear modulus obtained from bender element tests showed a significant decrease with the increase in mica content
X-Ray vision: a deep learning and grad-CAM powered web platform for chest disease diagnosis
No full textElectrical Tunability in Band-to-Band-Tunneling based Neuron for Low Power Neuromorphic Computing
No full textIn this work, we show the electrical control in the ultra-energy and area-efficient BTBT-based Si-neuron and the impact on network performance. We show the control of gate bias and current threshold on the spiking threshold and frequency. Finally, we show the impact of such design space on SNN performance and a 10-layer spiking Convolutional Neural Network (CNN). The result demonstrates that neurons' post-fabrication electrical tuning capability is essential for SNN performance improvement
Things unchanged: online and offline practice of an Indian first-year composition curriculum
No full textThe shape of classroom and learning in higher education has transformed during the COVID-19 pandemic in a way of increasing leaners' socialization and connectedness in the virtual setting. This paper examines four years' work of design, development, and refinement for a two-semester-long undergraduate first-year writing (FYW) course during and after the pandemic, throughout the transition from online to offline mode in India. Undergraduate FYW courses in India have multiple functions such as learning English as a second language and academic/social integration, and they were placed in an optimal position to compensate the lack of physical interactions and socialization during the pandemic. First, we discuss three designing principles that have been constant from the establishment of the curriculum: authentic learning with digital literacy, maximizing socialization, and empowering students' voice. Second, an online survey was conducted to measure students' perception and perspective on their adapted learning environments-online only, mostly online, mostly offline, and offline only conditions. The results indicate that the offline mode was overall more satisfactory for writing practice and learning while some functions in the online mode provided meaningful support for an interactive writing experience
m-Eternal domination and variants on some classes of finite and infinite graphs
No full textWe study the m-Eternal Domination problem, which is the following two-player game between a defender and an attacker on a graph: initially, the defender positions k guards on vertices of the graph; the game then proceeds in turns between the defender and the attacker, with the attacker selecting a vertex and the defender responding to the attack by moving a guard to the attacked vertex. The defender may move more than one guard on their turn, but guards can only move to neighboring vertices. The defender wins a game on a graph G with k guards if the defender has a strategy such that at every point of the game the vertices occupied by guards form a dominating set of G and the attacker wins otherwise. The m-eternal domination number of a graph G is the smallest value of k for which (G,k) is a defender win.
We show that m-Eternal Domination is NP-hard, as well as some of its variants, even on special classes of graphs. We also show structural results for the Domination and m-Eternal Domination problems in the context of four types of infinite regular grids: square, octagonal, hexagonal, and triangular, establishing tight bounds
Representative weather datasets for long-term temperature predictions in rigid pavements
No full textWinged Aerostat Systems for Better Station Keeping for Aerial Surveillance
No full textAn aerostat is a tethered balloon with an aerodynamically shaped envelope containing a lighter-than-air gas that generates bulk of the lifting force. Aerostats are used extensively as an aerial platform for many scientific and commercial applications. Conventional aerostats envelopes have an ellipsoidal shape, due to which they suffer from a large amount of horizontal displacement (called blowby) due to the ambient winds. If the drag force acting on aerostat is high, the resulting blowbyis higher and a longer tether is required to maintain the specified operating altitude; this results in lower payload capacity. Recent studies have shown that winged aerostats (which have an envelope with airfoil cross-section) can reduce blowbydue to a much higher lift/drag ratio. This paper presents a comparative analysis of the operational effectiveness of a winged and conventional aerostat for scientific data gathering in lower Himalayas at various ambient wind speeds. The winged aerostat is seen to be much smaller in size, and has a much lower reduction in operating altitude due to blowby. The paper also describes the design of a prototype winged aerostat currently under development
On-Demand Cueing Sensitive to Step Variability: Understanding Its Impact on Gait of Individuals With Parkinson’s Disease
No full textParkinson’s disease (PD) is characterized by gait disturbances with freezing of gait (FoG) being one of the most disabling symptoms. The FoG episode is often preceded by an increase in variability in Step Time. As the disease progresses, such gait impairment may become resistant to pharmacotherapy. Use of external cues is an alternative. Existing solutions deliver external cues in a continuous manner that might cause habituation effects, thereby emphasizing the need for on-demand cueing. Manual on-demand cueing upon freezing has been shown to be powerful in bringing an individual out of a freezing state. This can be achieved if one’s proneness to freeze before entering into freezing state can be sensed, and in-turn triggering an external cue on-demand. Motivated by this, we have developed a wearable device (SmartWalkVC) that can sense such proneness based on variability in Step Time to offer a visual cue on-demand. We conducted a study involving 20 age-matched healthy individuals and those with PD who walked overground while wearing SmartWalkVC operated in three modes with regard to offering visual cue, namely (a) On-demand cueing, (b) Continuous cueing and (c) No cueing. The results of our study showed that with on-demand cueing, those with PD had minimum variability of Step Time among all the three modes unlike healthy individuals whose gait remained majorly unaffected by different cueing modes. Also, walking speed increased along with a reduction in FoG episodes for those with PD in the on-demand cueing mode compared with the other two modes