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Bilateral trade relationships in the international level between pairs of countries in the world give rise to the notion of the International Trade Network (ITN). This network has attracted the attention of network researchers as it serves as an excellent example of the weighted networks, the link weight being defined as a measure of the volume of trade… (More)

A Barabási–Albert scale-free network is constructed whose nodes are the Poisson distributed random points within a unit square and links are the straight line connections among the nodes. The cost function, which is the total wiring length associated with such a network defined on a two-dimensional plane, is optimized. The optimization process consists of… (More)

A new sandpile model is studied in which bonds of the system are inhibited for activity after a certain number of transmission of grains. This condition impels an unstable sand column to distribute grains only to those neighbours which have toppled less than m times. In this non-Abelian model grains effectively move faster than the ordinary diffusion… (More)

R ecentexperi m ents at the l evelofa si ngl e cel lhave show n that gene expressi on occurs i n abrupt stochasti c bursts. Further,i n an ensem bl e ofcel l s,the l evel s ofprotei ns produced have a bi m odal di stri buti on. In a l arge fracti on of cel l s, the gene expressi on i s ei ther o or has a hi gh val ue. W e propose a stochasti c m odelofgene… (More)

- S. S. Manna
- 1996

We relate the fractal dimension of the backbone, and the spectral dimension of Eden trees to the dynamical exponent z. In two dimensions, it gives fractal dimension of backbone equal to 4/3 and spectral dimension of trees equal to 5/4. In three dimensions, it provides us a new way to estimate z numerically. We get z = 1.617 ± 0.004. Dense branching patterns… (More)

The dynamics of intermittent granular flow through an orifice in a granular bin and the associated clogging due to formation of arches blocking the outlet, is studied numerically in two-dimensions. Our numerical results indicate that for small hole sizes, the system self-organizes to a steady state and the distribution of the grain displacements decays as… (More)

In this paper we present detailed simulation results on the wealth distribution model with quenched saving propensities. Unlike other wealth distribution models where the saving propensities are either zero or constant, this model is not found to be ergodic and self-averaging. The distribution statistics with a single realization of quenched disorder is… (More)

- Sigmund Mongstad Hope, Sumanta Kundu, Chandreyee Roy, Subhrangshu S. Manna, Alex Hansen
- Front. Phys.
- 2015

Desert roses are gypsum crystals that consist of intersecting disks. We determine their geometrical structure using computer assisted tomography. By mapping the geometrical structure onto a graph, the topology of the desert rose is analyzed and compared to a model based on diffusion limited aggregation. By comparing the topology, we find that the model gets… (More)

- Biplab Bhattacherjee, Kunal Bhattacharya, S. S. Manna
- Front. Physics
- 2014

A simple model of the two dimensional collective motion of a group of mobile agents has been studied. Like birds, these agents travel in open free space where each of them interacts with the first n neighbors determined by the topological distance with a free boundary condition. Using the same prescription for interactions used in the Vicsek model with… (More)

- Biplab Bhattacherjee, S. S. Manna, Animesh Mukherjee
- Physical review. E, Statistical, nonlinear, and…
- 2013

We present the results of a detailed numerical study of a model for the sharing and sorting of information in a community consisting of a large number of agents. The information gathering takes place in a sequence of mutual bipartite interactions where randomly selected pairs of agents communicate with each other to enhance their knowledge and sort out the… (More)