Indian Institute of Technology Guwahati

About: Indian Institute of Technology Guwahati is a education organization based out in Guwahati, Assam, India. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 6933 authors who have published 17102 publications receiving 257351 citations.

“On Water”: Efficient Iron‐Catalyzed Cycloaddition of Aziridines with Heterocumulenes

Abstract: In suspension: the reaction of aziridines with heterocumulenes in the presence of Fe(NO(3))(3)⋅9H(2)O in aqueous suspension provides access to functionalized five-membered heterocycles in good to high yields. This protocol has a wide substrate scope, is simple, and uses a nontoxic and cheap catalyst.

Dynamics of reorientations and reversals of large-scale flow in Rayleigh–Bénard convection

Abstract: We present a numerical study of the reversals and reorientations of the large scale circulation (LSC) of convective fluid in a cylindrical container of aspect ratio one. We take Prandtl number to be 0.7 and Rayleigh numbers in the range from 6 � 10 5 to 3 � 10 7 . It is observed that the reversals of the LSC are induced by its reorientation along the azimuthal direction, which are quantified using the phases of the first Fourier mode of the vertical velocity measured near the lateral surface in the mid plane. During a “complete reversal”, the above phase changes by around 180 0 leading to reversals of the vertical velocity at all the probes. On the contrary, the vertical velocity reverses only at some of the probes during a “partial reversal” with phase change other than 180 0 . Numerically we observe rotation-led and cessation-led reorientations, in agreement with earlier experimental results. The ratio of the amplitude of the second Fourier mode and the first Fourier mode rises sharply during the cessation-led reorientations. This observation is consistent with the quadrupolar dominant temperature profile observed during the cessations. We also observe reorientations involving double cessation.

Superabsorbent hydrogel (SAH) as a soil amendment for drought management: A review

Abstract: Drought is one of the worst natural disasters that affect the economic, social, and environmental status of any country. The long-term drought affects the soil ecosystem and can initiate desertification and deterioration of soil health. This leads to severe water distress, which is further aggravated by improper water management, poor irrigation practice, degradation of soil quality, and low water holding capacity of soil. Effective land management is the most feasible solution during drought. It is established that the utilization of superabsorbent hydrogel (SAH) as a soil amendment can improve soil structure, water-holding capacity, and plant available water content because of its hydrophilic three-dimensional network. However, there are contrasting observations in the existing literature related to the absorption capacity of SAH under different conditions, which may have an impact on drought management. This study purports to critically review the findings reported in the literature to reveal the influence of SAH addition for solving water stress conditions. The influence of SAH application on the physical properties of soil, such as water retention capacity, plant available water content, hydraulic conductivity, and infiltration, was investigated. This study brings out the discrepancies associated with the influence of SAH application in different textured soil, presence of salinity, and biodegradation of synthetic SAH. It was found that the application of SAH can reduce the evaporation loss and deep percolation, thereby increasing the plant growth and survival time in drought despite some reduction in swelling capacity under saline condition. The need for further studies for the development of biodegradable SAH and its performance evaluation under various environmental conditions has been summarized.