Noise (AWGN) Avoidance in CDMA Systems Using the Mechanism of Spread Spectrum

In today communication systems the most probable problems are that of channel capacity, jamming and interference or noise. The channel capacity can be maximized by multiplexing the channel. While the jamming problem and for noise reduction the most important technique that we can apply is spread spectrum. That by spreading the spectrum of the original message signal, the impact of noise upon the message signal can be reduced. For that purpose, two different techniques that is DSSS(Direct Sequence Spread Spectrum) and FHSS (Frequency Hoping Spread Spectrum) can be applied. Since the two approaches are core ideas upon which CDMA system is based, so in this paper we have analyzed both the techniques to observe that h up to what extent they are efficacious in removing AWGN in CDMA systems communication. IndexTerms:DSSS, FHSS, Code Division Multiple Access (CDMA), Additive White Gaussian Noise (AWGN), spread spectrum

Integration of surfactants and time release nutrients with pneumatic fracturing process

The objective of this laboratory study was the development of two novel improvements to the pneumatic fracturing process which would extend its present application. The first involved use of surfactant during pneumatic injection, and the second was subsurface injection of time-release dry nutrient pellets for enhancement of in situ biodegradation. Bench scale tests demonstrated that pneumatic fracturing can be successfully performed with air containing a surfactant solution (foam fracturing). The results showed that foam fracturing followed by increased the rate of surrogate contaminant removal from 8% to 10% compared with regular pneumatic fracturing. These increases were attributed to enlarged fracture networks and increased airflow. Commercially available anionic surfactants, which are biodegradable, were used for the process. Recommendations for field scale applications were also developed. It was also shown that injection of time release nutrient pellets into subsoil during pneumatic fracturing is feasible. Bench scale equipment for this process was developed and tested. Mechanical damage of the nutrient pellets during pneumatic injection was evaluated by different methods, and it was determined that serious damage was sustained above 75 psi. These results suggest pellets with higher mechanical strength characteristics are necessary for successful field integration with pneumatic fracturing process

Increasing employee job satisfaction as well as organizational performance through effective HRM practices in private commercial banking sector of Bangladesh.

Private commercial banking sector in Bangladesh is booming in recent times with higher number of potential customers from the local market due to rapid industrialization. New private commercial banks are also opening in every five year times.  But this sector is facing challenges in achieving management efficiency one of which leads to experience high level of competition. In order to achieve sustainable growth in this competitive market, and to achieve higher organizational performance, special emphasis should be given to improve HRM practices in this sector. The relationships among HRM practices, Job satisfaction and business performance have been an integrated issue for business and operational environment. HRM practices are also considered as major contributory factor for higher organizational performance through higher job satisfaction. This study has been conducted to explore the influence of HRM practices on job satisfaction and how job satisfaction brings higher organizational performance. Since, the HRM practices are mostly responsible for the achievements of business strategy and success; particular attention has given in this paper to focus the importance of HRM practices. Key Words: HRM Practices, Job Satisfaction, Organizational Performance, Private Commercial Bank

STATUS OF “KUAKATA” A NEGLECTED NATURAL SCENIC RESOURCE OF BANGLADESH

There are many years since we have independent from the foreign ruling. But we are now in the least developed country because of lacking of the integration and inter-coordination among the different political, economical and social sectors. Though we are in the loaded position with the vast population, it would be the most resourceful by the proper nourishment and proper adoption with education, knowledge and training for the sustainable utilization of the God- gifted enormous natural resources. Kuakata the second largest Sea-beach is another one of the natural scenic resource of our country which is still now under negligence and mismanagement including its demographic development. By the proper planning and inter-sectoral coordination Kuakata can be turned into a most effective and largest economical source of the national revenue and common people livelihood. There has been tried to present the present demographic, educational, Hospitalization, transportation, present and potential resources and other tourism facilities in this study. Here is tried to highlight what have in this tourism place and what are to be needed in kuakata