Open Access Original Research Article

Modified Lee-Low-Pines Polaron in Spherical Quantum Dot in an Electric Field

A. J. Fotue, S. C. Kenfack, H. Fotsin, M. Tiotsop, L. C. Fai, M. P. Tabue Djemmo

Physical Science International Journal, Page 15-25
DOI: 10.9734/PSIJ/2015/15334

In this paper, we investigated the influence of electric field on the ground state energy of polaron in spherical semiconductor quantum dot (QD) using modified Lee Low Pines (LLP) method. The numerical results show the increase of the ground state energy with the increase of the electric field and the confinement lengths. The modulation of the electric and the confinement lengths lead to the control of the decoherence of the system.

 

Open Access Original Research Article

The Optical-Electro-Chemical Properties of CdS/CdSe/ZnS Co-Sensitized TiO2 Solar Cells

H. T. Tung

Physical Science International Journal, Page 26-34
DOI: 10.9734/PSIJ/2015/15227

Quantum dots solar cells (QDSSCs) based on the different CdS/CdSe/ZnS-TiO2 photo anodes were prepared by successive ionic layer adsorption and reaction (SILAR) processes. The CdS, CdSe and ZnS layers were considered by UV–Vis spectra for optical and the SILAR cycles of CdS, CdSe and ZnS show different impact on the performance of QDSSCs. With the deposition times of CdS increasing (from 1 to 5 cycles), the short circuit current density of the device is enhanced. On the contrary, the increasing deposition times of CdSe (from 1 to 5 cycles) has a negative effect for the generation and collection of photoelectron. In addition, the electrochemical impedance spectroscopy technology (EIS) was used to investigate the diffusion and recombination in QDSSCs. In addition, the dynamic resistances were discussed based on the EIS results.

 

Open Access Original Research Article

Cumulative Effects of the Temperature and Damping on the Time Dependent Entropy and Decoherence in the Caldirola-Kanai Harmonic Oscillator

M. P. Djemmo Tabue, A. J. Fotue, F. B. Pelap

Physical Science International Journal, Page 35-44
DOI: 10.9734/PSIJ/2015/15391

The time Dependence of probability and Shannon entropy of the specific damped harmonic oscillator systems is studied by using a prototypical Schrodinger cat state through the Feynman path method. By averaging the probability distribution over the thermal distribution of velocities, we show that, the temperature and the damped coefficient or dissipation as well as the distance separating two consecutive wave functions influence the coherence of the system.

 

Open Access Original Research Article

Investigations Microrelief of the Surface, Dielectric Properties and Fluorescence Spectrum of Natural Composite - Fish Scales

E. M. Gojayev, N. S. Nabiyev, M. A. Ramazanov, K. Sh. Kahramanov, Sh. V. Alieva, A. A. Ismailov

Physical Science International Journal, Page 45-53
DOI: 10.9734/PSIJ/2015/13299

In this paper, for creating highly sensitive and high-speed devices identified a new type of composite materials-fish scales, which are natural polymers. Fish scales are mineralized layer plates between which are collagen fibers. By the methods of Atomic - Force Microscope (AFM) were investigated surface microrelief in 2D and 3D scale. The frequency dependence of the dielectric constant, dielectric loss, surface density of space charges of natural composite - fish scales of Kutum studied  in the frequency range 0 -103 kHz. Discovered that the main mechanoreceptor units of the lateral line is neyromasty, this contains several sensitive hair cells. These hair cells are similar to the sensory cells of hearing on the receptor cells neyromasty end in the branching efferent nerve fibers. Irritants receptors are streams of water and low-frequency oscillations of the medium. It was also revealed that, in a narrow frequency range 0-1 kHz reduced and in a wide range 1-1000 kHz remains constant. Right and left side fish scales have the same dielectric characteristics.

Using a spectrofluorimeter Cary Eclipse fluorescence spectrum studied the fish scale in a wavelength 200-600 nm. It was revealed that, the excitation signal wavelength 396.96, 388, 265.93 and 253.64 of the fluorescence observed at a wavelength of 541.02, 528.96, 362.00, 495.97, respectively, and the intensity of the detected fluorescence peaks almost all comparable intensity of the exciting signal Kutum fish has fluorescent properties and can be successfully used in technology.

 

Open Access Original Research Article

Petrophysical Analysis and Volumetric Estimation of Otu Field, Niger Delta Nigeria, Using 3D Seismic and Well Log Data

T. N. Obiekezie, E. E. Bassey

Physical Science International Journal, Page 54-65
DOI: 10.9734/PSIJ/2015/15320

Petrophysical analysis and volumetric estimation was carried out using 3D seismic and well log data to evaluate the reservoir potentials of Otu Field in the Niger Delta of Nigeria. Three hydrocarbon bearing reservoirs (C10, D10 and D31) were mapped out of several identified sands. The tops of these reservoirs were tied on the seismic section using checkshots and were traced throughout the seismic volume. Faults were mapped and structure maps for the three reservoir tops were produced. For C10 reservoir mapped at the depth of about 4512 feet, gas-down-to (GDT) was picked at 4525 feet and Oil-water contact (OWC) was picked at 4592 feet. For D10 reservoir mapped at the depth of about 5337 feet, oil-water contact was picked at 5404 feet and D31 reservoir which was mapped at depth 5536 feet has oil-water contact at 5675 feet. The gross thickness of the C10 reservoir sandstone formation ranges from 45 ft to 78.5 ft. Since the reservoir was intercalated with shale, the net thickness varied between 11.5ft and 54.5ft. The gross thickness of the D10 reservoir varied between 55.5 ft and 103 ft; while the net thickness varied between 13 ft and 51 ft. The gross thickness of D31 reservoir varied between 127.5 ft and 273 ft and the net thickness varied between 11 ft and 114 ft. The petrophysical parameters obtained were porosity (ϕ) ranging from 0.32 to 0.34, water saturation (Sw) ranging from 0.23 to 0.29, hydrocarbon saturation (SH) varies between 0.71 and 0.77 and net to gross (N/G) which ranges from 0.21 to 0.47. The volume of the closures (GRV) gotten from the structure maps were combined with the relevant petrophysical parameters to estimate the volume of hydrocarbon in place. The estimation of the volume of hydrocarbon revealed that C10 contains 45.98b ft3 of gas and 95.18 million stock tank barrels of oil. The D10 and D31 reservoirs have oil with the volume estimated at 21.41 million stock tank barrels and 54.32 million stock tank barrels respectively. The study revealed that the field is prolific and the estimated volumes of hydrocarbon in the closures are satisfactory for further exploration work.

 

Open Access Review Article

Synergistic Use of Passive and Active Remote System Imagery: Review on Bangladesh Perspective

Subaran Chandra Sarker, Masum A. Patwary

Physical Science International Journal, Page 1-14
DOI: 10.9734/PSIJ/2015/13991

Background: Remote sensing data are widely used in different sectors in all over the world. Remote sensing data are two types; one is active while another is passive remotely sensed data. In Bangladesh recently remote sensing data are widely used in different filed of applications while the application of remote sensing has started in the early 1970s. However, its uses are limited because lack of expertise and required financial support to obtain updated information and logistics support. The major users are SPARRSO (Bangladesh Space Research and Remote Sensing Organization), LGED (Local Government Engineering Department), Universities and CEGIS (Center for Environmental and Geographic Information Services). The main objective of this paper is to explore the different uses of remote sensing data in different applications of Bangladesh.

Methodology: Study was done by accumulation of secondary published data through desk based literature review.

Results: Remote sensing data have mainly used in the environmental application, river dynamics, flood monitoring, coastal zone monitoring, wetland monitoring, agricultural monitoring, forestry and urban applications. In these above applications are mainly used Landsat, SPOT, IRS-LISS, Ikonos and Radarsat remote sensing data. At present the researches with remote sensing data are emerging slowly within two major organizations such as SPARRSO and CEGIS while the universities are lagging behind.

Conclusion: This study has revealed that if the government of Bangladesh will take the initiative to provide logistics support, remote sensing data applications area will be increased in near future which would be helpful to develop different infrastructural plan.