Kapilanjan Krishan

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Surfactants at air/water interfaces are often subjected to mechanical stresses as the interfaces they occupy are reduced in area. The most well characterized forms of stress relaxation in these systems are first order phase transitions from lower density to higher density phases. Here we study stress relaxation in lipid monolayers that occurs once chemical(More)
We use a quantitative topological characterization of complex dynamics to measure geometric structures. This approach is used to analyze the weakly turbulent state of spiral defect chaos in experiments on Rayleigh-Bénard convection. Different attractors of spiral defect chaos are distinguished by their homology. The technique reveals pattern asymmetries(More)
For crystalline materials, the microscopic origin of plasticity is well understood in terms of the dynamics of topological defects. For amorphous materials, the underlying structural disorder prevents such a description. Therefore identifying and characterizing the microscopic plastic events in amorphous materials remains an important challenge. We show(More)
We characterize the kinematics of bubbles in a sheared two-dimensional foam using statistical measures. We consider the distributions of both bubble velocities and displacements. The results are discussed in the context of the expected behavior for a thermal system and simulations of the bubble model. There is general agreement between the experiments and(More)
Id2 cDNA was isolated from a subtractive screen of stage-12 quail caudal somites. In situ hybridisation analysis identified the previously un-described expression of Id2 mRNA in distinct medial and lateral domains of the somitic dermamyotome in both quail and chick embryos. Id2 expression in somites was highly dynamic being first initiated in the lateral(More)
A fundamental difference between fluids and solids is their response to applied shear. Solids possess static shear moduli, while fluids do not. Complex fluids such as foams display an intermediate response to shear with nontrivial frequency-dependent shear moduli. In this paper, we conduct coordinated experiments and numerical simulations of model foams(More)
Age estimation is an important aspect of forensic investigation and is considered as one of the "Big Four" of Forensic Anthropology. One hundred and twenty (120) cephalograms of individuals aged 7-20 years were examined with reference to mandibular body length (distance between Gonion and Gnathion) mandibular length (distance between Co and Gn) and(More)
In equilibrium systems, time and ensemble averages of physical quantities are equivalent due to ergodic exploration of phase space. In driven systems, it is unknown if a similar equivalence of time and ensemble averages exists. We explore effective limits of such convergence in a sheared bubble raft using averages of the bubble velocities. In independent(More)
ACKNOWLEDGEMENTS A number of people have guided and participated in the efforts that has resulted in this thesis. As an advisor, Mike has been an inexhaustible source of optimism, no matter how far the experiments might seem from the desired results. Much of the experimental development on laser actuation would not have progressed as long without his(More)
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