12,806 research outputs found

    Utilizing rapid prototyping 3D printer for fabricating flexographic PDMS printing plate

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    Recently printed electronic field is significantly growth. Printed electronic is to develop electrical devices by printing method. Conventional printing method that has been studied for this kind of printed electronic such as flexographic, micro contact printing, screen printing, gravure and ink jet. In flexographic and microcontact printing, a printing plate is used to transfer the designed and desired pattern to substrate through conformed contact. Therefore printing plate is play a big role in this area. Printing plate making by photopolymer which used in flexographic have limitation in achieving a micro-scale of pattern size. However, printing plate of microcontact printing have an advantages in producing micro, even nano-scale size by PDMS (Polydimethylsiloxane). Hence, rapid prototyping 3D printer was used for developing a PDMS micro-scale printing plate which will be used in reel to reel (R2R) flexographic due to high speed, low cost, mass production of this type of printing process. The flexibility of 3D printer in producing any shape of pattern easily, contributed the success of this study. A nickel plating and glass etching master pattern was used in this study too as master pattern mould since 3D printer has been reached the micro size limitation. The finest multiple solid line array with 1mm width and 2mm gap pattern of printing plate was successfully fabricated by 3D printer master mould due to size limitation of the FDM (Fused Deposition Modeling) 3D printer nozzle itself. However, the micro-scale multiple solid line array of 100micron and 25micron successfully made by nikel platting and glass etching master mould respectively. Those types of printing plate producing method is valueable since it is easy, fast and low cost, used for micro-flexographic in printed electronic field or biomedical application

    On entropy, specific heat, susceptibility and Rushbrooke inequality in percolation

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    We investigate percolation, a probabilistic model for continuous phase transition (CPT), on square and weighted planar stochastic lattices. In its thermal counterpart, entropy is minimally low where order parameter (OP) is maximally high and vice versa. Besides, specific heat, OP and susceptibility exhibit power-law when approaching the critical point and the corresponding critical exponents α,β,γ\alpha, \beta, \gamma respectably obey the Rushbrooke inequality (RI) α+2β+γ≥2\alpha+2\beta+\gamma\geq 2. Their analogues in percolation, however, remain elusive. We define entropy, specific heat and redefine susceptibility for percolation and show that they behave exactly in the same way as their thermal counterpart. We also show that RI holds for both the lattices albeit they belong to different universality classes.Comment: 5 pages, 3 captioned figures, to appear as a Rapid Communication in Physical Review E, 201

    Scale-free network topology and multifractality in weighted planar stochastic lattice

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    We propose a weighted planar stochastic lattice (WPSL) formed by the random sequential partition of a plane into contiguous and non-overlapping blocks and find that it evolves following several non-trivial conservation laws, namely ∑iNxin−1yi4/n−1\sum_i^N x_i^{n-1} y_i^{4/n-1} is independent of time ∀ n\forall \ n, where xix_i and yiy_i are the length and width of the iith block. Its dual on the other hand, obtained by replacing each block with a node at its center and common border between blocks with an edge joining the two vertices, emerges as a network with a power-law degree distribution P(k)∼k−γP(k)\sim k^{-\gamma} where γ=5.66\gamma=5.66 revealing scale-free coordination number disorder since P(k)P(k) also describes the fraction of blocks having kk neighbours. To quantify the size disorder, we show that if the iith block is populated with pi∼xi3p_i\sim x_i^3 then its distribution in the WPSL exhibits multifractality.Comment: 7 pages, 8 figures, To appear in New Journal of Physics (NJP

    Database independent Migration of Objects into an Object-Relational Database

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    This paper reports on the CERN-based WISDOM project which is studying the serialisation and deserialisation of data to/from an object database (objectivity) and ORACLE 9i.Comment: 26 pages, 18 figures; CMS CERN Conference Report cr02_01

    Emergence of fractal behavior in condensation-driven aggregation

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    We investigate a model in which an ensemble of chemically identical Brownian particles are continuously growing by condensation and at the same time undergo irreversible aggregation whenever two particles come into contact upon collision. We solved the model exactly by using scaling theory for the case whereby a particle, say of size xx, grows by an amount αx\alpha x over the time it takes to collide with another particle of any size. It is shown that the particle size spectra of such system exhibit transition to dynamic scaling c(x,t)∼t−βϕ(x/tz)c(x,t)\sim t^{-\beta}\phi(x/t^z) accompanied by the emergence of fractal of dimension df=11+2αd_f={{1}\over{1+2\alpha}}. One of the remarkable feature of this model is that it is governed by a non-trivial conservation law, namely, the dfthd_f^{th} moment of c(x,t)c(x,t) is time invariant regardless of the choice of the initial conditions. The reason why it remains conserved is explained by using a simple dimensional analysis. We show that the scaling exponents β\beta and zz are locked with the fractal dimension dfd_f via a generalized scaling relation β=(1+df)z\beta=(1+d_f)z.Comment: 8 pages, 6 figures, to appear in Phys. Rev.
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