Network of Recurrent events - A case study of Japan

A recently proposed method of constructing seismic networks from 'record breaking events' from the earthquake catalog of California (Phy. Rev. E, 77 6,066104, 2008) was successfull in establishing causal features to seismicity and arrive at estimates for rupture length and its scaling with magnitude. The results of our implementation of this procedure on the earthquake catalog of Japan establishes the robustness of the procedure. Additionally, we find that the temporal distributions are able to detect heterogeneties in the seismicity of the region.Comment: 13 pages, 6 figures, 1 tabl

The discourses of doing science in English

In January 2003, Malaysia re-adopted the English language as a medium of instruction for science and mathematics. This change in the medium of instruction brings with it challenges of its own. What does it mean to 'do' science in the Malaysian context and to do so in English? How does the change in the medium of instruction from Bahasa Malaysia to English impinge upon current instructional and literacy practicesof teachers and learners? What kinds of change are required of the community that is invested in the teaching of science? This paper will address these questions by troubling some common-sense assumptions of 'doing' science in the Malaysian context in the light of findings of a qualitative case study conducted to investigate how one two teachers working in different contexts in a Malaysian school copes with the new medium of instruction and the myriad of issues that come with it

SYNTHESIS AND STRUCTURAL ANALYSIS OF COBALT OXIDE NANOPARTICLES

Cobalt (II, III) oxide is an inorganic compound with the formula Co3O4. It is a blackantiferromagnetic solid. As a mixed valence compound, its formula is sometimes written asCoIICo2 III O4 and sometimes as CoO.Co2O3. The XRD result confirmed the formation of simplecubic crystal structure of the Co3O4. The average crystallite size of the samples are found toincrease with increase in annealing temperature. The optical energy band gap values estimatedby UV-visible analysisreported that the energy band gap values are increased with increase incalcination temperature. So that Co3O4 nanoparticles are used as p-type semiconductor. ThePhotoluminescence sharp peaks shows a near and edge emission located at UV region and greenemissions

Asymptotic Properties of Solutions of Two Dimensional Neutral Difference Systems

In this paper we obtain sufficient conditions for the asymptotic properties of solutions of two dimensional neutral difference systems. Our result extends some existing results in the literature. An example is given to illustrate the result

Charity of Patinenkil Kanakku Nulkal

Voluntary help is the charity. Only by adding material. The doesn’t mean you have to help. The big charity is the one who uses what he does not need for his life and gives the rest to others. Eleven accounts best illustrate this equivalence of giving to the other side of receipt. But in our lives, we adhere to giving as soon as we receive something. the best quality is to give in advance to other as you would to point out what is being done in this world is for the hereafter our ancestors considered it unethical to expect that. Compassion makes a gift realizes that Mallam. In this world we are the glory off the charity that lasts after death

On the structural response of eukaryotic cells

textThe actin, microtubule and intermediate filament cytoskeletal polymer assemblies, along with their accessory proteins, govern the mechanical or structural response of an eukaryotic cell to an external stress. Using statistical mechanics tools, this dissertation investigates the molecular properties, such as mesh size, persistence length and filament length, that determine the structural strength of the in vivo polymer networks, with an emphasis on the actin network or the cortex of cells. Our study of actin shows how the wide range of shear moduli from 1 Pa to 1 kPa that spans the viscous sol-like state to the elastic gel-like state witnessed in eukaryotic cells can be achieved through transient crosslinking and the spatial distribution of actin and actin crosslinking proteins alone. Thus, this gel-sol transition is achieved without the action of any severing or capping proteins that depolymerize the actin network. In order to understand how the microscopic quantities controlling the structural properties of these in vivo polymers are related to the deformation of a cell observed experimentally, a cell model is created by us. It starts with modeling the actin cortex as a thick shell and increases in complexity to include microtubules and the nucleus. Our cell model predicts that the structural response of the cell amplifies changes in molecular properties such as the in vivo actin concentration. Hence, the sensitivity of the structural response to cytoskeletal changes can be used to distinguish between different cells such as normal and cancer cells and can serve as an indicator of disease.Physic

CCVD synthesis of carbon nanotubes from (Mg,Co,Mo)O catalysts: influence of the proportions of cobalt and molybdenum

Carbon nanotubes have been synthesised by catalytic chemical vapour deposition of a H2–CH4 mixture (18 mol% CH4) over (Mg,Co,Mo)O catalysts. The total amount of cobalt and molybdenum has been kept constant at 1 cat% and the proportion of molybdenum with respect to cobalt has been varied from x(Mo) = 0.25–1.0. This variation has important effects on both the yield and the nature (number of walls, straight walls or bamboo-like structures) of the carbon nanotubes. It also has an influence on the purity of the samples (amount of encapsulated metal particles, presence or not of amorphous carbon deposits). For x = 0.25, the nanotubes were mainly double- and triple-walled (inner diameter less than 3 nm); samples prepared from catalysts with higher molybdenum ratios contained larger multi-walled carbon nanotubes (inner diameter up to 9 nm), having up to 13 concentric walls. It is proposed that different growth mechanisms may occur depending on the initial composition of the catalyst