GPON, the Ultimate Pertinent of Next Generation Triple-play Bandwidth Resolution, Journal of Telecommunications and Information Technology, 2011, nr 2

Optical transmission is getting more popular in the access network due to the increasing demand for bandwidth. New services like IP television (IPTV) transmission, video on demand (VoD) etc. over Internet together along high speed Internet access are confronting the demand of higher bandwidth at the customer end in today’s Ethernet network backbone. Even though today’s well deployed XDSL (i.e., VDSL/VDSL2+, SHDSL) solutions can satisfy bandwidth demand but are limited to the restriction regarding distance. Hereby, the suitable solution for high bandwidth demand with a long reach can be met by reaching optical cable to customer end directly. One of the possible ways would be to install passive optical network (PON). Gigabit PON (GPON) is the far-most advanced PON solution used by European and US providers while providers in Asia predominantly use EPON/GePON. This GPON is the basic technology to support the structure of the next-generation fiber to the home (FTTH) system. This paper provides an overview of such GPON solution associating its network architecture, transmission mechanisms and some key services

Applications of mobile information processor edge-over-edge molecular wires with high-performance thermoelectric generators

If high-efficiency organic isotherm models for mobile processors can be found, a variety of energy harvesting devices, such as Peltier coolers composed of flexible and transparent thin-film materials, might be manufactured. The thermoelectric characteristics of three zinc porphyrins (ZnP) were studied. Theoretical analyses of electron transport across a potassium (Zn-Diphenyl porphyrin: Zn-DPP) molecular sandwiched between electrode surface with three distinct connections were investigated. The contribution of this research is to see what happens because once pyridine is added above the surface of the zinc-porphyrin skeleton, the "edge-over-edge"dimer created from stacked formed rings has a high electrical conductance, minimal exciton thermal conductance, and a large thermal diffusivity on the order of 300 V K1. At room temperature, these variables add up to a projected ZT 4 figure of merit, the greatest ZT for a single organic molecule ever seen. The stacked arrangement of the porphyrin rings causes low phonon thermal conductance, which delays phonon transport across the edge-over-edge molecule and increases the Seebeck coefficient, resulting in a higher ZT value

Study on the correlation of prevalence of ocular disease to psoriasis and other concomitant diseases in patients with psoriasis in Saudi Arabia

Objective: Ocular diseases are chronic type associated with multiple factors. This research investigates correlation of prevalence of ocular disease to different demographic variables, medical history and psoriasis as well as other concomitant diseases in patients with psoriasis.Design: A survey-based study was conducted.Setting: The research was conducted among patients with ocular diseases in a hospital of Saudi Arabia.Participants: The study was approached to be conducted among 120 patients with psoriasis and age≥ 18 years. 101 patients admitted to participate.Intervention: Questionnaire was prepared to get information from patients. Observations of Ophthalmologists and dermatologists were recorded. Statistical package for social sciences (SPSS version 22) was used for data entry and analysis. Odd ratios and Chi-square test were used to analyze the correlations.Results: Our study has found significant correlation of prevalence of diabetes mellitus and ocular complication and significant correlation of prevalence of diabetes mellitus and cataract. We also observed significant correlation between the prevalence of hypoparathyroidism and ocular complication and significant correlation between the prevalence of having hypoparathyroidism and cataract. Having dyslipidemia and ocular complication was found to be significantly correlated. Our study found association between presence of cataract and topical steroid use. Our findings have focused on the treatment modalities commonly used in Saudi Arabia. Conclusion: Our research findings indicate that proper management of the correlated diseases can prevent the occurrence and severity of ocular diseases

Determination of creep behaviour of concrete made by brick chips in Bangladesh

Concrete made of brick chips as coarse aggregate are extensively used in Bangladesh for construction of different types of structures from residential and commercial buildings to industrial complex. As creep is influenced among many factors including the constituents’ materials, relative humidity and temperature, it is essential to examine the creep behavior for Bangladeshi brick chips made concrete in Bangladeshi environment. In this work, investigation on the behaviour of creep in concrete of same grade made with brick chips collected from various locations under single stage loading was done. With these investigations, a formula was derived to get theoretical creep values for 24 MPa brick chips made concrete in Bangladeshi environment

Fluid structure interaction (FSI) simulation of the left ventricle (LV) during the early filling wave (E-wave), diastasis and atrial contraction wave (A-wave)

In this paper, the hemodynamic characteristics inside a physiologically correct three-dimensional LV model using fluid structure interaction scheme are examined under various heart beat conditions during early filling wave (E-wave), diastasis and atrial contraction wave (A-wave). The time dependent and incompressible viscous fluid, nonlinear viscous fluid and the stress tensor equations are coupled with the full Navier-Stoke's equations together with the Arbitrary Lagrangian-Eulerian and elasticity in the solid domain are used in the analysis. The results are discussed in terms of the variation in the intraventricular pressure, wall shear stress (WSS) and the fluid flow patterns inside the LV model. Moreover, changes in the magnitude of displacements on the LV are also observed during diastole period. The results obtained demonstrate that the magnitude of the intraventricle pressure is found higher in the basal region of the LV during the beginning of the E-wave and A-wave, whereas the Ip is found much higher in the apical region when the flow propagation is in peak E-wave, peak A-wave and diastasis. The magnitude of the pressure is found to be 5.4E2 Pa during the peak E-wave. Additionally, WSS elevates with the rise in the E-wave and A-wave but the magnitude decreases during the diastasis phase. During the peak E-wave, maximum WSS is found to be 5.7 Pa. Subsequent developments, merging and shifting of the vortices are observed throughout the filling wave. Formations of clockwise vortices are evident during the peak E-wave and at the onset of the A-wave, but counter clockwise vortices are found at the end of the diastasis and at the beginning of the A-wave. Moreover, the maximum magnitude of the structural displacement is seen in the ventricle apex with the value of 3.7E-5 m

Data on COVID-19 Positive Frontline Workers in Bangladesh

From July 26 to August 12, 2020, we used a qualitative approach to conduct ten interviews, utilizing a semi-structured interview guide. The participants were recruited via a social media campaign and purposive sampling. All interviews were conducted via telephone and online and were transcribed and analyzed using Colaizzi's phenomenological method.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV