1,723,228 research outputs found
Yamuna revival should be seen as a sacred duty
Get PDFThe pollution of River Yamuna became a focal point during the Delhi elections 2025. The Arvind Kejriwal-led Aam Aadmi Party failed to fulfil its promise of cleaning the Yamuna and was voted out of power. This failure was highlighted by all other political parties, most notably the Prime Ministerled Bharatiya Janata Party (BJP), as symbolic of failure to deliver on many other promises made to the people
Alluvial river response to active tectonics in the Dehradun region, Northwest India: A case study of the Ganga and Yamuna rivers.
Get PDFIn environments characterised by active tectonics, it is widely accepted that river morphology will be affected by active fault displacement. For example, there is documented evidence of change in channel slope, channel width, channel braiding patterns, grain size distribution trends, and stream power in response to active faults. Therefore, river morphology can carry a measurable signature of tectonic activity. Furthermore, it can be hypothesised that fluvial systems are in fact more sensitive to local faulting than raw topographic expression. This would mean that young active faults will affect river morphology before they are expressed in the local topography. Therefore, detailed morphological measurements of rivers in tectonic settings could allow for an early detection of faulting which is not yet expressed in the landscape.
The Dehradun region of the Northwest Himalayan foothills is an ideal test case for this hypothesis. In this area, the Ganges and Yamuna rivers flow across an active thrust fault system, which is not yet clearly visible in the landscape. Therefore, longitudinal river profiles of the Ganges and Yamuna rivers from the Lesser Himalaya mountain front to ~35 km into the Gangetic Plain were extracted from a 90 m Digital Elevation Model and hydraulic features, including width of channel belt, channel slope, and geomorphic characteristics, were collected from IRS 23.5 m satellite images. Stream power was calculated by using channel slope and monthly discharge data. These data were complemented by field measurements of bed material grain sizes at ~5 km intervals. All data were analysed for the ~80 km Ganges and Yamuna reaches flowing from the Main Boundary Thrust, through the alluvial Dehra Dun valley and across the suspected active Himalayan Frontal Thrust, and ~35 km out into the Indo-Gangetic foreland.
The longitudinal profile, width of channel belt, channel slope, braiding relationship, pattern of stream power, and grain size distribution all indicate river response to active slip on the Himalayan Frontal Thrust. Most importantly, channel slope (0.063) increases in response to an uplifted bed, and elevation drop over the fault axis. The Yamuna channel slope shallows upstream of, and proximal to the HFT (~0.0025) and steepens across the fault axis to (~0.0035) in response to an uplifted bed and elevation drop. Width of channel belts narrow across the HFT in response to constriction by uplifted topography from ~1500 m upstream to ~500 m across the HFT. This is reflected in the braiding index as both rivers flow as one channel across the HFT and as many channels in the Dun and foreland. The grain size trend along the Ganges reflects downstream fining by selective entrainment throughout the entire study reach with no variation interpreted as having a high enough stream power to move all sediment. The Yamuna indicates downstream fining through the Dun valley, yet grain size increases immediately, upstream of the HFT. This is interpreted as being due to low stream power within the Mohand Anticline caused by a low discharge and shallowing channel slope.
This study concludes that the Ganges and Yamuna rivers are responding to active tectonic uplift of the HFT in the Dehradun basin, Northwest India
India, Yamuna Bridge on Yamuna River in Delhi
No full textBridge across Yamuna River, South Delhi.GrayscaleSorensen Safety Negatives, Binder: Asia
Yamuna Riverfront
No full textgeneral view, Hindu shrine along Yamuna River near Taj Mahal, with inscription plaque to Lord Ganesh and Hindu gods, dated 3-8-199
Yamuna, Vol. 13 (1923/1924)
Get PDFYamuna was a Bengali magazine in the 20th century. It was published by P. N. Pal
Yamuna, Vol. 13 (1923/1924)
No full textYamuna was a Bengali magazine in the 20th century. It was published by P. N. Pal
India, canal on Yamuna River in Delhi
No full textYamuna River dam in Okhla neighborhood.GrayscaleSorensen Safety Negatives, Binder: Asia
Health Monitoring of Electro-Mechanical Actuators for primary flight surfaces
Get PDFThis thesis has been developed under the funded project named REPRISE (Reliable Electromechanical actuator for PRImary SurfacE with health monitoring), which aims to design a novel Electro-Mechanical Actuator (EMA) to be used on primary flight surfaces of small aircrafts. The main feature of the enhanced system is a novel embedded Health Monitoring (HM) component, which aims at assessing the grade of deterioration of the specimen without resorting to additional sensing within the EMA, but by monitoring the indirect effects that the operating degradation of the mechanical transmission elements has on measurements not directly related to their status.
The entire work has been validated experimentally by the employment of a dedicated test bench to perform endurance tests, gradually leading the mechanical components to final failure. The deterioration has been evaluated also by visual inspection and screw thread profile measurements. The effectiveness of the CD algorithm has been proven despite there was no evidence of loss of ability in pursuing the EMA main function of position tracking.
This work delivers an important contribution to the More Electric Aircraft mission and lies the foundation for the development of an HM module able to estimate the Remaining Useful Life (RUL) of the specimen and thus allowing maintenance actions when the an upcoming failure is advised, in a Predictive Maintenance strategy
The Yamuna: Need for Inclusive Debate
No full textThe prevailing attitude is that ‘development’ is important, and that if people have to be pushed around for this, so be it. This a response to the views expressed by E Sreedharan on the Yamuna, ‘Restrict Yamuna with walls and develop low-lying areas: Metro chief’ (Times of India, May 20, 2009). It is published here in the interest of furthering debate.Yamuna, rivers, river waters, Delhi, development, pollution, river water management, India
A Comparison of the Bacterial Communities of the Yamuna River (India) and Mississippi River (USA)
Get PDFThis study compared the bacteria in the Yamuna River in India and the Mississippi River in the USA. Water samples were taken from 11 sites (2 in the Mississippi River and 9 in the Yamuna River). The bacteria were identified using 16S rRNA gene sequencing. Some phyla such as Proteobacteria and Bacteroidetes were seen in abundance regardless of country. However, principal-component analysis showed three distinct groupings: Mississippi/Ganga/Tons and other Yamuna River locations (7 sites), Yamuna River at Delhi (2 sites), Yamuna River below Glacier (2 sites) Additionally, the Yamuna River below Glacier had the highest bacterial diversity, with a Shannon index of 5.1 and a Simpson index of 0.986 when compared to both the Yamuna River below Glacier (Shannon p-value: \u3c0.0001, Simpson p-value: \u3c0.0001) and the Yamuna River at Delhi (Shannon p-value: \u3c0.0001, Simpson p-value: \u3c0.0001)
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