Disaster risk reduction measures n Bangladesh

Disasters damage the entire economy of the country when they predominantly take place in developing countries. While no country in the world is entirely safe, lack of capacity to limit the impact of hazards has made developing countries being the most vulnerable nations to natural disasters. Bangladesh is being identified as a country that is vulnerable to climate change and subsequent natural disasters every year. Dense population and poverty has reduced the adaptability of Bangladesh in disastrous situations thus further increasing severity of impact from disasters. Owing to geographical settings, Bangladesh is currently ranked as one of the world’s most disaster-prone countries in the world. The frequent natural hazards such as cyclones, storm surges, floods, droughts, tornados,riverbank erosions, earthquakes, arsenic contamination of groundwater and landslides account for significant losses in human lives and physical assets while effects are further reflected in social settings, ecosystems and the economic well-being of the country. This paper evaluates the types of natural disasters Bangladesh is subjecting to, how they have affected the Bangladesh community and existing disaster risk reduction strategies. Paper also evaluates four main domains of disaster vulnerability reduction measures namely physical, engineering, structural and organisational. Existing disaster risk reduction strategies adopted in Bangladesh are linked with the aforementioned four domains of disaster vulnerability reduction measures. A comprehensive literature review is used as the research method. Literature synthesis suggests that Bangladesh is being using a combination of disaster risk reduction measures ranging from technical to social measures

U.S. Airways Merger: A Strategic Variance Analysis of Changes in Post-Merger Performance

This case provides students the opportunity to apply strategic variance analysis (SVA) methodology in analyzing the performance changes realized in an airline merger. The U.S. Airways–America West merger provides an example of a complex, strategic action that simultaneously impacts firm size, unit pricing and costs, efficiency, and capacity for the combining airlines. This merger provides a rich example for the analysis since it combines U.S. Airways, a higher cost network airline that is geographically focused on the Eastern U.S., with America West, a low cost airline operating primarily along the Western U.S. The case includes merger and acquisition (M&A) theory discussing market power vs. efficiency motives for mergers and discusses the role of the U.S. Department of Justice and Federal Trade Commission in evaluating M&As and their impact on markets. The case asks students to serve as consultants applying the SVA methodology to the past U.S. Airways–America West merger and provide conclusions

Three-dimensional modulation instability of dust-ion-acoustic waves and rogue waves in warm nonthermal magnetized plasmas

A theoretical investigation has been made to study the modulation stability/instability of three-dimensional dust-ion-acoustic wave packets in the warm magnetized complex plasma system in the presence of nonthermal distributed electrons and positrons species. The set of equations describing our plasma system has been reduced to a (3+1)-dimensional nonlinear Schr\"odinger equation by using the reductive perturbation method that is valid for finite but small amplitude limits. It is observed that both nonlinear and dispersive coefficients of (3+1)-dimensional nonlinear Schr\"odinger equation are significantly modified by the external magnetic field and transverse velocity perturbation. The regions of stable and unstable for the modulated dust-ion-acoustic waves have been examined numerically. Moreover, the dependence of modulation instability and rogue waves on the relevant plasma parameters is discussed. The implications of our theoretical results in space and laboratories magnetized dusty plasma medium is briefly discussed.Comment: 7 pages, 9 figures, original articl

Design and development of a slot-less permanent magnet linear motor using permeance analysis method for spray application

Mostly in industrial spray applications pneumatic systems are utilized for operating the automatic spray gun. Linear motor can be one of the alternatives for triggering the spray gun instead of pneumatic systems due to its accuracy in valve positioning according to the required flow rate. From this point of view a tubular linear permanent magnet motor has been designed using Permeance Analysis Method (PAM) and developed. Three permeance models have been developed for PAM analysis. Among these three models, only one model is selected as a PAM model which can be produced the required amount of thrust for triggering the spray gun. After selecting the PAM thrust model, the size of the motor has been optimized by analyzing the effect of thrust constant, electrical and mechanical time constant. Finally based on the optimized data, the motor has been fabricated and tested that shows the good argument with the analysis result

Impact Of Leather Industries On Groundwater In Tamil Nadu With Special Reference To Vellore District

Tanning industry is a one of the traditional business industry in India. The leather and leather based industries can emphasize to be the world’s one of the largest industrial sector based upon a by-product. Leather and leather goods are vital role in the foreign exchange earnings. Tannery process unit is very important factor for enhancing the quality in leather production. On the other side, during this processes large quantum of toxic waste is disposed into the nature which invites vital threat to the environment at large. It leads to the contamination of water resources (both surface and ground water), soil resources and other flora and fauna. The rate of environmental degradation reflected by the decline of agricultural productivity and the quality of natural resources like water, soil, etc has decline at very high rate. The main focus of this paper is to emphasize the impact of leather industry on groundwater source in the study area. This study is descriptive in nature, simple statistical tools are used and the major finding will be addressed in this paper

Intermittency in Two-Dimensional Turbulence with Drag

We consider the enstrophy cascade in forced two-dimensional turbulence with a linear drag force. In the presence of linear drag, the energy wavenumber spectrum drops with a power law faster than in the case without drag, and the vorticity field becomes intermittent, as shown by the anomalous scaling of the vorticity structure functions. Using a previous theory, we compare numerical simulation results with predictions for the power law exponent of the energy wavenumber spectrum and the scaling exponents of the vorticity structure functions $\zeta_{2q}$ obtained in terms of the distribution of finite time Lyapunov exponents. We also study, both by numerical experiment and theoretical analysis, the multifractal structure of the viscous enstrophy dissipation in terms of its R\'{e}nyi dimension spectrum $D_q$ and singularity spectrum $f(\alpha)$. We derive a relation between $D_q$ and $\zeta_{2q}$, and discuss its relevance to a version of the refined similarity hypothesis. In addition, we obtain and compare theoretically and numerically derived results for the dependence on separation $r$ of the probability distribution of \delta_{\V{r}}\omega, the difference between the vorticity at two points separated by a distance $r$. Our numerical simulations are done on a $4096 \times 4096$ grid.Comment: 18 pages, 17 figure

Configuration Detection of Grounding Grid: Static Electric Field Based Nondestructive Technique

Grounding grid configuration which, is key to its fault diagnosis, changes continuously with the extension in a substation. Furthermore, older substations grounding grid configurations are unknown. Existing literature regarding configuration detection mainly accounts for the magnetic field that required a gradient to locate the grounding conductor. The gradient of raw measurement in the substation vicinity enhances electromagnetic noise and distorts the results. Therefore, in this paper, we have developed a new algorithm, Configuration Detection of Grounding Grid (CDGG) based on the static electric field and the concept of ordered pairs to draw the configuration of the unknown grounding grid. Unlike, the practiced magnetic field, the electric field does not require a gradient. The maximum electric field value indicates the location of a grounding conductor. The connection between nodes is verified by measuring the electric field on the circle. Furthermore, the proposed algorithm also locates any diagonal conductor in the configuration. Mathematical reasoning and simulation results illustrate that our proposed algorithm is feasible to draw the configuration of the unknown grounding grid

Portable Device for Continuous Sensing with Rapidly Pulsed LEDs – Part 1: Rapid On-the-fly Processing of Large Data Streams using an Open Source Microcontroller with Field Programmable Gate Array

We designed a portable system using an open source microcontroller (μC) with built-in field programmable gate array (FPGA) for on-the-fly data acquisition and processing of optical data generated from rapidly pulsed infrared light emitting diodes (IR LEDs) for optical sensing of gases. The system is used for rapid pulse generation (ca. 2 μs short pulses with a typical repetition rate of 1 kHz) to drive the IR LED, as well as for the optical sensing data acquisition and processing on-thefly large data streams of ca. 2 Gbit/s. The flexibility and performance of the system is demonstrated. Each of the digitally processed signal pulses yielded one data point of analytical signal in time as a quasi-continuous data stream produced at a rate of between 1000 and 0.1 Hz. This microcontroller-based portable open source platform is then implemented in on-the-fly data acquisition and processing, of analytical signals enabling continuous gas sensing