Stochastic resonance with different periodic forces in overdamped two coupled anharmonic oscillators

We study the stochastic resonance phenomenon in the overdamped two coupled anharmonic oscillators with Gaussian noise and driven by different external periodic forces. We consider (i) sine, (ii) square, (iii) symmetric saw-tooth, (iv) asymmetric saw-tooth, (v) modulus of sine and (vi) rectified sinusoidal forces. The external periodic forces and Gaussian noise term are added to one of the two state variables of the system. The effect of each force is studied separately. In the absence of noise term, when the amplitude $f$ of the applied periodic force is varied cross-well motion is realized above a critical value ($f_{\mathrm{c}}$) of $f$. This is found for all the forces except the modulus of sine and rectified sinusoidal forces.Stochastic resonance is observed in the presence of noise and periodic forces. The effect of different forces is compared. The logarithmic plot of mean residence time $\tau_{\mathrm{MR}}$ against $1/(D - D_{\mathrm{c}})$ where $D$ is the intensity of the noise and $D_{\mathrm{c}}$ is the value of $D$ at which cross-well motion is initiated shows a sharp knee-like structure for all the forces. Signal-to-noise ratio is found to be maximum at the noise intensity $D=D_{\mathrm{max}}$ at which mean residence time is half of the period of the driving force for the forces such as sine, square, symmetric saw-tooth and asymmetric saw-tooth waves. With modulus of sine wave and rectified sine wave, the $SNR$ peaks at a value of $D$ for which sum of $\tau_{MR}$ in two wells of the potential of the system is half of the period of the driving force. For the chosen values of $f$ and $\omega$, signal-to-noise ratio is found to be maximum for square wave while it is minimum for modulus of sine and rectified sinusoidal waves.Comment: 13 figures,27 page

REVIEW OF INFECTIOUS AGENT IN CARCINOGENESI OF BRAIN

This study focuses on anatomically localized tumors in the head and neck areas. Brain cancers and head and neck cancers cause more than 873,000 cases worldwide each year, increasing every year. With late survival rates, brain and head and neck cancers are more likely to be serious conditions. Oncology is a multi-step process and the role of infectious agents in this development has not been fully identified. A major problem with such research is that the role of many infectious agents can be underestimated due to a lack or discrepancy in the experimental data obtained worldwide. As for brain cancer, no infection is directly accepted as cancer, although many viruses and parasites are associated with malignancies. Our analysis of the literature showed that human cytomegalovirus (HCMV) exists in different types of brain tumors, namely Cleoplastoma Multiform (GPM) and Meduloblastoma. In particular, GPM models have reports of up to 100% virus protein. Several epidemiological studies have reported links between brain cancer and toxoplasmosis seropositivity. In head and neck cancers, there is a distinct link between Epstein-Barr virus (EPV) and nasopharyngeal carcinoma (NBC). Considering that each undifferentiated NPC is EPV-positive, the virus titer size can be measured to show high risk people. In addition, there is an obvious link between the human papilloma virus (HPV) and head and neck squamous cell carcinoma (HNSCC); In particular, 26% of HNSCCs are positive for HPV. HPV type 16 is the most common type diagnosed in HNSCCs (90%) and its prevalence is higher than reported in cervical cancer. Despite numerous studies showing the association of infectious agents with cancer, there is a dearth of articles covering the role of infection in brain and head and neck cancers, with different levels of involvement and direct or indirect causal effects. We review recent studies on the infectious origin of these cancers and present our current understanding of mechanisms for cancer, thereby providing possible new approaches to cancer treatment.   &nbsp

Experimental evidence for vibrational resonance and enhanced signal transmission in Chua's circuit

We consider a single Chua's circuit and a system of a unidirectionally coupled n-Chua's circuits driven by a biharmonic signal with two widely different frequencies \omega and \Omega, where \Omega >> \omega. We show experimental evidence for vibrational resonance in the single Chua's circuit and undamped signal propagation of a low-frequency signal in the system of n-coupled Chua's circuits where only the first circuit is driven by the biharmonic signal. In the single circuit, we illustrate the mechanism of vibrational resonance and the influence of the biharmonic signal parameters on the resonance. In the n(= 75)-coupled Chua's circuits enhanced propagation of low-frequency signal is found to occur for a wide range of values of the amplitude of the high-frequency input signal and coupling parameter. The response amplitude of the ith circuit increases with i and attains a saturation. Moreover, the unidirectional coupling is found to act as a low-pass filter.Comment: 15 pages, 12 figures, Accepted for Publication in International Journal of Bifurcation and Chao

DNA Intuitionistic fuzzy turing machine

The restriction enzymes of bacteria are used to cut and insert the two strands of double-stranded DNA at different positions that cause overhangs of single stranded DNA. We developed an encoding transition table of an intuitionistic fuzzy Turing machine that processes series of restriction(cut) and ligation of DNA fragments or oligonucleotides that can be used to find the Body Mass Index of human being.Publisher's Versio

Characterization of uniform and hybrid cellular automata with null boundary

In this article, we dispute about the characterization of Cellular automata with restricted vertical neighborhood and Von neumann neighborhood of null boundary conditions over the field Z₂ in uniform cellular automata and hybrid cellular automata. Transition rule matrix for uniform and hybrid cellular automara with null boundary condition is obtained and the reversibility of the uniform cellular automata studied.Publisher's Versio

Evaluation of serum anticardiolipin antibody levels in patients with chronic periodontitis and essential hypertension: A clinico-biochemical study

Abstract Background Periodontitis and hypertension, both of which are chronic inflammatory and asymptomatic in nature have a high prevalence in general population. Anti-cardiolipin antibodies are often directed against cardiolipin which is an important component of inner mitochondrial membrane. Anti-CL antibodies can increase in chronic infection and inflammation, thrombosis, stroke, myocardial infarction and atherosclerosis. Hence the study was aimed to elucidate a link between Periodontitis and systemic inflammatory status by estimating the serum Anti-CL antibodies in patients with chronic Periodontitis and essential hypertension.   Materials and Methods Sixty subjects who fulfilled the inclusion and exclusion criteria were selected and divided in to four equal groups-  1.Healthy controls, 2. Periodontally healthy-hypertensive, 3. Chronic Periodontitis-hypertensive and 4.Chronic Periodontitis-systemically healthy. Serum samples collected from the subjects were analysed for Anti-CL antibodies by using a specific ELISA kit. Statistical method; the data obtained were subjected to statistical analysis using t-test.   Results Anti-CL antibody levels were elevated in chronic Periodontitis- hypertensive patients (Group 3)  (3.7600±0.29665) compared with other groups, followed by (Group 2) Periodontally healthy-hypertensive(2.5200±0.22804)(p<0.001).   Conclusion Chronic Periodontitis results in increased systemic inflammatory burden that can further contribute to elevation of Anti-CL antibodies in hypertensive patients.   Key words; Anti cardiolipin antibodies, Chronic Periodontitis, Essential hypertension, Inflammatory markers  Serum,  Systemic inflammation.   Word count :188 words   Running title; Anti Cardiolipin antibodies and Periodontiti

Pd(II)-doping studies on tris(thiourea)zinc(II) sulphate crystals: Catalytic effect of Pd(II)-doping on SHG efficiency

Single crystals of Pd(II)-doped tris(thiourea)zinc(II) sulphate (ZTS) have been grown from an aqueous solution by conventional slow evaporation solution growth technique. The characteristic functional groups have been identified by FTIR analysis. Crystal stress has been indicated by powder XRD patterns and FTIR analysis. Incorporation of dopant into the crystalline matrix during crystallization process has been evidenced by energy dispersive X-ray spectroscopy and quantified by inductively coupled plasma technique. The surface morphological changes have been observed in the doped specimen. Mechanical stability of the as-grown specimen has been analyzed by Vickers microhardness analysis. Thermal studies reveal no decomposition up to the melting point. Lattice parameters determined by single crystal XRD analysis reveal only minor variations as a result of low doping. Pd(II) doping has a catalytic effect on the second harmonic generation efficiency improvement of zinc thiourea complex