November 2011
Evaluation and analysis on profitability – Efficiency in hospitals affiliated with the ministry of health
Measuring performances of the hospitals under Ministry of Health is a must for the efficient use of the resources. To serve this purpose, data envelopment analysis, capable of measuring relative effectiveness of decision units by processing more than one input and output, has been used. By means of data envelopment analysis technique, we have aimed to use the resources efficiently. For this reason, the model...
November 2011
Sensitivity of Schur stability of systems of linear difference equations with constant coefficients
In this work, sensitivity of the Schur stability and the -Schur stability of linear difference equation systems with constant coefficients have been investigated, and new results on the sensitivity problem have been given. The results have applied the scalar-linear difference equations with order and supported with numerical examples and also compared with the existing ones in the...
November 2011
Acute, subacute toxicity and cytotoxicity of Chrysophyllum perpulchrum
The total methanolic extracts of Chrysophyllum perpulchrum were used for toxicological (acute and subacute toxicity) and cytotoxicity studies. The experiment focuses on Swiss mice acclimatized in the animal cages at the University of Cocody-Abidjan. Each cage contains five mices of the same age (6 to 8 weeks), in much the same weight (20 ± 0.5 g) and same sex (male or female). The extract...
November 2011
Alteration of bus routes in large-scale networks
Route assignment and scheduling of buses are critical in network utilization and modification of bus routes should seek more efficient methods for operation. Ineffective operations would increase the average travel time and therefore decrease the level of service which yields increase in social cost. This paper presents an alteration method for increasing the efficiency of bus networks considering the...
November 2011
InP-based multi-quantum-well mole fraction variation effects on a double wafer-fused GaAs/InP LW-VCSEL
We analyze the effects of the mole fraction variation of III-V heterostructures employed as the active region in an InP-based multi-quantum-well (MQW), long-wavelength vertical-cavity surface-emitting laser (LW-VCSEL). The VCSEL model which utilizes an air-post design for electrical current confinement is equipped with GaAs/AlGaAs and GaAs/AlAs top and bottom distributed Bragg reflectors(DBR) mirrors...
November 2011
A study on thermal and electrical properties of high density polyethylene/high density polyethylene grafted maleic anhydride/ montmorillonite/ polypyrrole blend
Conducting polypyrrole (PPy) was synthesized by chemical polymerization method. The synthesized PPy was characterized by Fourier transform infrared spectrometer (FTIR) and its conductivity was measured by a resistometer. Then, PPy was incorporated into high density polyethylene/montmorillonite nanocomposites. PPy concentration varied in the range of 5 to 20% by weight in nanocomposites using melt mixing...
November 2011
The investigation of dynamic performance of induction generator in different operational conditions and improving its behaviour using proper FACTS devices
The object of this paper is to study the possibility of using of SVC and STATCOM in order to improve dynamic performance of induction generator. Also, these two devices have been compared with each other. Induction generators have many advantages in small wind-hydro power plants. On the other hand arising some problems including controlling of voltage and frequency oscillation due to dynamic oscillation of...
November 2011
Dynamic stratigraphy of upper cretaceous in Northwest zogros (Kermanshah)-Iran
Kermanshah is part of the structural zone of autochtone Zagros in the boundary of Arabian and Iran plates. Stratigraphy sequence of upper cretaceous in two structural blocks of Kouh-e-Sefid in south and Kouh-e-Nesar in southwestern of Kermanshah up to Campanian stage was observed as similar sequence. There is a function of existing faults in area with distinct sedimentary condition in every block...
November 2011
A critical review of nonlinear fuzzy multiple time-delay interconnected systems using the Lyapunov criterion
This paper reviews the development of fuzzy systems and the problem of time delay control in nonlinear systems. Based on this review, a fuzzy Lyapunov method defined in fuzzy blending quadratic Lyapunov functions is proposed from which to derive stability conditions. In the controller procedure, a parallel distributed compensation (PDC) scheme is utilized to construct a global fuzzy logic controller (FLC) by blending...
November 2011
Evaluation of the effect of nanohydroxyapatite on erosive lesions of the enamel of permanent teeth following exposure to soft beer in vitro
Consumption of carbonated acidic beverages is the main etiological factor in dental erosion. Studies have shown that nanohydroxyapatite has the potential to remineralise primary carious lesions. This experimental study was carried out on 18 permanent teeth. Following measurement of the primary micro hardness value of each tooth, the teeth were immersed in 40 ml soft beer, followed by measurement of secondary...
November 2011
Using state feedback control to stabilize unstable equilibrium points of the unified fractional-order chaotic system
In this paper, a state feedback controller is designed to stabilize a class of fractional order unified systems at their unstable equilibrium points. The fractional-order chaotic Chen system is chosen to get stabilized in two cases of commensurate and incommensurate orders. An observer based technique is used to identify an unknown parameter of the unified system. The system with identified parameter is...
November 2011
Edge Detection innovator based on wavelet coefficients for images corrupted by the white-gaussian noise
Denoising of images is one of the vital topics in image manipulating. Approaches for denoising a chain of images aims to attenuate additive noise to the lowest possible rates by using both spatial and temporal areas. Conversely, extracting the edges of images that affected by the White-Gaussian noise was the major dilemma faced by many researchers. Many of the denoising image methods based on wavelet have...
November 2011
A novel design and development of persistence layer for heterogeneous synchronous replication in data grid
Data grid provided a way to solve the problems of large-scale data management. Data-intensive applications such as high-energy physics and Bioinformatics required both computational and data grid features. Replication is a process to achieved efficient and fault-tolerant access in the data grid. Usually, data replication schemes maintain an entire replica in every site where a file is replicated. It provided...
November 2011
Prediction of nickel-based super alloy surface roughness in CNC end milling operation using connectionist models
This paper outlines a comparative study of different Artificial Neural Network models and ‘adaptive-networks-based fuzzy inference systems’ approach for predicting the surface roughness (Ra) using cutting speed (v), feed rate (fr) and cutting depth (d) when machining Nickel-based super alloys with uncoated carbide tool under milling conditions. Nickel-based super alloys are generally known to be...
November 2011
Microsatellite gene diversity within Philippines dwarf coconut palm (Cocos nucifera L.) resources at Port-Bouët, Côte d’Ivoire
Description and assessment of genetic resources are common preoccupations for their better management and utilization in breeding program. Progress made to date is still limited in view of assessment of coconut resources in the International Coconut Genebank for Africa and Indian Ocean (ICG-AIO) at Marc Delorme Port-bouët experimental station in Côte d’Ivoire. Using twelve microsatellite...
November 2011
Osteoma orbitalis: A case report and literature systematic review
Orbital osteoma is a very rare benign tumor in orbit, and its diagnosis and treatment were certain particularity. Therefore, we reported one case of osteoma orbitalis and reviewed relevant literature, in order to further understand clinical features of osteoma orbitalis. A 38-year-old female was hospitalized due to left exophthalmos after frontal trauma for 5 years. Physical examination: left exophthalmos...
November 2011
Proposed design of anaerobic wetland system for treatment of mining waste water at former tin mining catchment
This research provides an approach for designing a constructed wetland system for treatment of tin contaminated wastewater from mining catchment. Initially, physico-chemical characteristics and concentration of heavy metals in the soil and ponds were evaluated. It was found that the soil and water quality of the area is highly degraded. This study will help for the design of the wetland for...
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