Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2759

SRE Articles

Obtaining soil stiffness using WAK test and numerical methods

November 2011

  A study has been undertaken at musicale in the laboratory to simulate the densification of a sandy soil bed by dynamic compaction. This was achieved by allowing a tamper mass of 875 g to fall through 100 mm onto a stiff aluminium target having a mass of 268 g and a diameter of 100 mm. Since the frequencies generated by this process are very low, the dynamic stiffness derived approximately the static value...

Author(s):   Mansour Parvizi and Hossein Sharif  

Proposed methodology to enhance C4I systems security on architectural level

November 2011

  Command control, communication, computer and intelligence (C4I) systems are the back bone complex information and communication systems for modern information warfare (IW). Managing security in C4I systems is a challenge due to complexity and criticality of these systems. This paper elaborates design methodology to incorporate security in the C4I systems in systematic and consistent way instead of patching...

Author(s):   Abdullah Sharaf Alghamdi, Tazar Hussain, Gul Faraz Khan, Khalid Alnafjan and Abdul Haseeb

Three body abrasive wear of X12CrNiMo martensitic stainless steel laser alloyed with TiC

November 2011

  Martensitic stainless steels (MSSs) are often used for applications that require high wear resistance and hardness. A laser multi-track overlapping process was employed to fabricate TiC-reinforced metal matrix composite (MMC) coatings on X12CrNiMo steel substrate using a 4.4 kW continuous wave (CW) Nd: YAG laser. 50 and 75% overlap were produced. Comparative studies of the three-body abrasive wear...

Author(s):   A. P. I.  Popoola and D. I. Adebiyi

Effects of layer arrangements on bending strength properties of laminated lumber made of poplar (Populus nigra L.)

November 2011

  In this study, the effects of layer arrangements on bending properties of laminated wood products have been investigated. Poplar (Populus nigra L.) and polyvinyl acetate (PVA) were used as wood and adhesive, respectively. Bending static properties (MOE and MOR) of laminated products comprising various combinations of layer arrangements resulting in 5 combinations were measured. The results of this study...

Author(s):   Ali Bayatkashkoli, Mohammad Shamsian and Marjan Mansourfard

Technical efficiency and meta-technology ratios of regional firms in Bangladesh: A stochastic meta-frontier model

November 2011

  We examined the relative influence of preference of a stochastic metafrontier model to evaluate the technical efficiencies and meta-technology ratios of firms that may be classified into different regions but not have the same technology. The empirical application of the model used panel data set of six different regional firms in Bangladesh. We observed low mean technical efficiency scores 17.7%, 15.9, 13.4...

Author(s):   Kanis Fatama Ferdushi, Anton Abdulbasah Kamil, Md. Azizul Baten and Adli Mustafa

In-vitro anti-bacterial activities of crude n-hexane extracts of Garcinia kola (Heckel) seeds against some Vibrio bacteria isolated from wastewater effluents

November 2011

  Crude n-hexane extracts of the seed of Garcinia kola were screened for their in-vitro anti-Vibrio activities against 50 Vibrio bacteria isolated from wastewater final effluents in the Eastern Cape Province of South Africa. The extract at a screening concentration of 10 mg/ml resulted in zones of inhibition ranging from 10 to 14 mm against the susceptible isolates and the...

Author(s):   Okoh AI and Penduka D

Analysis of possibility for traffic safety improvement based on Serbian traffic violation database analysis

November 2011

  In order to improve traffic safety, both reactive and proactive approaches are used. Unlike the reactive, the proactive approach ’does not wait’ for traffic accidents to happen to start analysing traffic safety conditions. The proactive approach implies traffic safety improvement based on the analysis of so-called indirect traffic safety indicators, like the behaviuor of traffic participants, and...

Author(s):   Dalibor Pesic, Milan Vujanic, Krsto Lipovac and Boris Antic

Investigation of flow and vacuum lifting force on a non-contact end effector for robotic handling of non-rigid material

November 2011

  This study identifies the need for a new range of end effectors suitable for non-rigid products and introduces a novel non-contact gripping device. The end effector operates on the principle of generating a high-speed fluid flow between the end effector and product surface thereby creating a vacuum which levitates the product. The lifting forces and conditions are discussed by using optimization methodology...

Author(s):   Ethem Toklu and Fehmi Erzincanli

Mobile data collector based routing protocol for wireless sensor networks

November 2011

  In the era of New Generation Networks (NWGN) many emerging and future enable technologies accomplish the requirements of ubiquitous communication networks. Mobile wireless sensor network (mWSN) is one of the rising and emerging technologies for various application of NWGN, the enormous concerns of these networks are data gathering with energy efficiency. Routing protocol act as middleware, which is...

Author(s):   Muhammad Arshad, Nasrullah Armi, Nidal Kamel and N. M. Saad

Impact of the new road traffic safety law on the number of traffic casualties in Serbia

November 2011

  In this research the analysis of the impact of the new road traffic safety law (new RTSL) in Serbia to the decrease of the number of killed in traffic accidents in Serbia is shown. The effects of a new legislation and larger enforcement made by new RTSL implementation to the decrease of the number of killed and injured in traffic have been analysed by comparing the number of killed and injured in traffic in...

Author(s):   Boris Antić, T. E., Milan Vujanić, T. E., Dragan Jovanović, T. E. and Dalibor Pešić, T. E.

Preparation, characterization and adsorption performance of the KOH-activated carbons derived from kenaf fiber for lead (II) removal from waste water

November 2011

  In this study, activated carbon was prepared from kenaf fiber (KF) by using physiochemical activation method consisting of potassium hydroxide (KOH) impregnation with carbon dioxide (CO2) gasification. Pore structure and physical characteristics of the prepared activated carbon were determined. Adsorption studies for divalent lead (Pb) were carried out to delineate the effect of contact time,...

Author(s):   Zaira Zaman Chowdhury, Sharifuddin Mohd. Zain, Rashid Atta Khan and Muhammad Aqeel Ashraf

A comparative study for electricity generation in microbial fuel cell reactor with and without mediators

November 2011

A microbial fuel cell (MFC) reactor with two compartments has been constructed from cheap materials and used for electricity generation from artificial mineral glucose medium (MGM) and test the adding or not adding  the mediators during four separate experiment. The maximum voltages yield at external resistance 30 Ω on the mediator - less experiments was 401 mV, while when the mediators have been methylene...

Author(s): Al-Shehri, A. N., Ghanem, K. M., and Al-Garni, S. M.

Flow injection spectrophotometric and spectrofluorimetric methods for the determination of candesartan cilexetil in pharmaceutical formulations

November 2011

  This article describes the development of flow injection methods for the determination of Candesartan Cilexetil using spectrophotometery and spectrofluorimetry in pharmaceutical formulations. The first method is based on the UV absorption at 270 nm in phosphate buffer containing cetyl trimethylammonium bromide (CTAB) and methanol at pH 6.5. The second method based on the fluorescence excitation and...

Author(s):   Ayisha Khalid, Amir Waseem, Iftikhar Afzal, Mohammad Yaqoob, Abdul Nabi and Mohammad Masoom Yasinzai

Co-integration analysis on all-variety Boro rice yields

November 2011

  The Boro rice is one of the most important rice in Bangladesh. It has three varieties namely: high yielding, local and Pajam. The all-variety Boro rice yield of Rajshahi and Rangpur districts have been selected for the period from 1985 to 2007 to measure the relationship between them. Our study shows a cointegrating relationship exist between the yields. The speed of adjustment coefficient of the error...

Author(s):   Provash Kumar Karmokar, and Mahendran Shitan,  

FPGA implementation of elliptic curve cryptography engine for personal communication systems

November 2011

  Elliptic Curve Cryptography (ECC), which allows smaller key length as compared to conventional public key cryptosystems, has become a very attractive choice in wireless mobile communication technology and personal communication systems. Any cryptosystem requires a very quick computation in very short time to get an optimal efficiency. One of the options could be to implement the overall cryptosystem into FPGA...

Author(s):   Md. Syedul Amin, Md. Mamun and Jubayer Jalil

The effect of semi-solid processing parameters on microstructure in Al-7wt.%Si alloy

November 2011

  In the present work, the effect of temperature and pressing time on the microstructure of a Al-7wt.%Si alloy was studied. Al-Si specimens were prepared by pre-shaping powder obtained with mechanical processing from Al-7wt.%Si alloy produced with ingot metallurgy under 800 MPa pressure. The prepared specimens were subjected to semi-solid processing at 100 MPa pressure and at different temperatures (580, 590...

Author(s):   Dursun Özyürek

A new adaptive model for throughput enhancement and optimal relay selection in IEEE 802.16j MMR networks

November 2011

  Network deployment problem is one of the major issues when base stations and relay stations are jointly deployed. Deploying relay station at suitable position covers throughput enhancement and coverage extension problem in IEEE 802.16j MMR networks. In this paper we have proposed a new adaptive model for throughput enhancement and optimal relay selection in IEEE 802.16j MMR networks and studied about the...

Author(s):   D. Satish Kumar and N. Nagarajan

Evaluation of bone mineral density in hyperprolactinemic patients treated with dopamine agonists

November 2011

The purpose of this study is to evaluate the bone mineral density (BMD) of hyperprolactinemic women after at least one year treatment with dopamine agonists. A total of 24 patients and 24 healthy control women (mean age of 33 ± 8 and 33.8 ± 0.8 years, respectively, P = 0.74) were participated in this study. Measurement of fasting serum prolactin and estrogen level in the follicular phase was carried out...

Author(s): Hajieh Bibi Shahbazian, Karim Mowla and Sirous Zarei

Aboveground biomass and productivity of nitrogen-fixing tree species in the Philippines

November 2011

Aboveground biomass and productivity traits of two nitrogen-fixing exotic species (Acacia auriculiformis A. Cunn. ex Benth. and Acacia mangium Willd.) and one nitrogen-fixing native species (Pterocarpus indicus Willd.) were compared in this study using 10 and 20-year-old age classes. Parameters measured were stand density, basal area, importance value index, aboveground biomass and carbon, annual...

Author(s): Marilyn S. Combalicer, Don Koo Lee, Su-Young Woo, Pil Sun Park, Ki Woong Lee, Enrique L. Tolentino, Edwin A. Combalicer, Yong Kwon Leeand Yeong Dae Park

Effect of irrigation regime and method of strip irrigation system on yield, yield components and water use efficiency of cotton under drought stress conditions of Orzouiyeh region of Kerman province in Iran

November 2011

Deficit irrigation is one of the most important methods of management of irrigation to save irrigation water without much damage to plants. Field experiment was conducted in 2010 to study the effect of irrigation deficit and method of irrigation on yield and yield components and water use efficiency of cotton in Orzouiyeh region of Kerman province of Iran.  Treatments consisted of three levels of water...

Author(s): Rasoul Asadi, Nader Kohi and Abolfazl Tavassoli

A rule-based system for fixture design

November 2011

Modern market imposes stringent demands regarding the product quality/price ratio, with an ever decreasing time-to-market. Furthermore, products are increasingly manufactured in small batches and high varieties, which requires flexibility not only from manufacturing system but the entire manufacturing process. Such demands require manufacturing systems which are highly automated in the domain of preparation and...

Author(s): Djordje Vukelic, Branko Tadic, Ognjan Luzanin, Igor Budak, Peter Krizanand Janko Hodolic

Definition and prioritization of electronic solutions affecting environment: A case study on air pollution of Tehran

November 2011

Air pollution caused by highway traffic is one of the major problems of Iran’s capital, Tehran. Application of modern electronic systems and devices can reduce or even cut urban travels and the air pollution caused by vehicles. In this study, the main objective is to propose a pattern to prioritize electronic solutions (e-solutions) based on the respective air pollution reduction caused by each solution. After the...

Author(s): Javad Jassbi, Majid Abbaspour, Jamshid Nazemi and Zahra Veyseh

The effect of extracted bacterial LPS from Salmonella enteritidis on COX-2 in hepg2 cell line in induction and inhibition conditions

November 2011

Hepatocellular carcinoma is the fifth most common neoplasm and the most important cause of death in patients with liver cirrhosis in the world. lipopolysaccharide (LPS) stimulates the hepatocyte cells and increases the production of inducible cytokine with the high production of nitric oxide and ROS. Chronic inflammation caused by lipopolysaccharide directly activates immune system and indirectly, through COX-2...

Author(s): Hossein Rastegar, Hamid Reza Ahmadi Ashtiani,, Mehdi Hedayati, and Akram Mirzaei

Vegetative induced ground displacements: a comparison of numerical and experimental study

November 2011

A volume change was modeled as a result of matric suction change caused by vegetative induced moisture transfer. Theory of unsaturated soil mechanics and two stress state variables principles approach was used in the stress-deformation model. The negative pore-water pressures are estimated through governing partial differential equations for unsaturated soils. The results of the root water-uptake analysis are then used...

Author(s): Mu’azu Mohammed Abdullahi, Nazri Bin Ali and Kamarudin Bin Haj Ahmad

The use of factorial design for proliferation assay of hFOB cells on different TiO2 nanotube arrays

November 2011

The ordered TiO2 nanotubes on titanium substrate were fabricated by anodization. The nanotubes are well aligned and organized into uniform arrays. The effects of anodization voltage on the oxide layer of morphology were investigated. The average diameter pore size is 20 and 88 nm at 5 and 20 V, respectively. In surface wettability, these TiO2 nanotubes showed hydrophilic behavior by sessile drop technique. In...

Author(s): Yi-Hsien Huang, Kuan-Chen Kung, Tzer-Min Lee and Ching-Cheng Wang

Evaluation of methylation status in glutation S-transferase P1(GSTP1) gene promoter in human breast cancer and its relation to tumor grade and stage

November 2011

Glutation S-transferase P1 (GSTP1) gene methylation in promoter CpG islands has been described as a specific biomarker for many types of cancer including breast cancer as a tumor suppressor gene. At the present study we found that the GSTP1 gene promoter to be methylated in breast cancer tissues. For studying the difference of sequence in hypermethylated GSTP1 promoter in cancer tissues and non methylated status in...

Author(s): Shohreh Alizadeh Shargh, Zahra Mostakhdemin Hosseini and Meral Sakizli

The role of sulphur dioxide and gas flare particulates on the corrosion of galvanized iron roof sheets in south-south region of Nigeria

November 2011

The failure of galvanized iron roofs is one of the problems suspected to be associated with environmental pollution in the south- south region of Nigeria often called Niger Delta. In this study, two parameters, sulphur dioxide and particulate matters linked to gas flaring were examined in an outdoor exposure test to determine their relative contributions to the corrosion impact. The experiment involved the exposure of...

Author(s): Obia, Ajah Ekpeni, Okon, Hanson Effiong, Ekum, Samuel Aji, Onuegbu, Anyanso Edede and Ekeng, Patricia Orok

A comparative analysis of the virtual reference stations (VRS)

November 2011

The concept of network Real Time Kinematic (RTK) method has enlarged the possible applications of precise positioning. While other network concepts are available, virtual reference stations (VRSTM) is by far the most popular choice for the nationwide networks. On the other hand, the available Network RTK methods are frequently questioned due to their location-dependent nature. This study introduces Turkish RTK Network...

Author(s): Ömer YILDIRIM

Protection of an archaeological site: A case study of Chiremba balancing rocks, Epworth, Harare, Zimbabwe

November 2011

Chiremba balancing rocks, Epworth, Harare, Zimbabwe was declared a national monument in 1994 on the basis of its unique physical rock formations, magnificent scenery and archaeological and scientific richness, comprising a rich corpus of biodiversity and rock paintings. Both direct and indirect human impacts leading to different levels of degradation or even destruction of this archaeological site have been witnessed in...

Author(s): Alfred Maroyi

Implications of environment regulations on industrial development, under the conditions of adopting the EU-ETS scheme in Romania: An analysis

November 2011

The growing interest in limiting the negative effects of pollution on the European level led to the development and implementation of a European mechanism, beginning with 2003, voluntarily assumed by all the member states aiming at reducing the greenhouse gases, besides the mechanism required by the Kyoto Treaty. The effects of this mechanism on the industry development inside the community as well as on each member...

Author(s): Ion Ioniţă, Jean Andrei and Florin Aurelian Popescu

A novel shape optimization method using knot insertion algorithm in B-spline and its application to transonic airfoil design

November 2011

A new method using the cubic B-spline curves with nominal uniform knot set to parameterize the geometry is proposed to deal with shape optimization problems. In the method, the control points of the B-spline curves are set to be the design variables in the optimization scheme. A knot insertion algorithm has been introduced in order to keep the geometry unchanged whilst increasing the number of...

Author(s): P. A. Sherar, C. P. Thompson, B. Xu and B. Zhong

Anomaly detection and prediction of sensors faults in a refinery using data mining techniques and fuzzy logic

November 2011

Like all manufacturing companies, refineries use many sensors to monitor and control the process of refining, therefore it is very crucial to detect any sensor faults or anomalies as early as possible, and to be able to replace or repair a sensor well in advance of any fault. Objective of this paper is to present a method for detecting anomalies in a sensor data, as well as to predict next occurance of a sensor failure....

Author(s): Mahmoud Reza Saybani, Teh Ying Wah, Amineh Amini and Saeed Reza Aghabozorgi Sahaf Yazdi

Power system damping using GA based fuzzy controlled TCSC device

November 2011

In introduction, this paper investigates the application of TCSC hybrid controller for improving damping inter-area modes of oscillations. The proposed controller comprised fuzzy logic proportional and derivative controller with the conventional proportional and integral controller (FUZZY PD + PI) turn by genetic algorithm techniques. Approaching the proposed control scheme implements the characteristics of the...

Author(s): N. Magaji, M. W. Mustafa and Z. Muda

Life cycle impact assessment (LCIA) using EDIP 97 method: An analysis of potential impact from potable water production

November 2011

Life cycle assessment (LCA) is a method to analyze a particular product or service; from the beginning of the process it is extracted until it is no more in use or much to be known as ‘cradle to grave analysis’. The LCA analysis includes collection of inventory that is all types of emissions and also waste products. After that, this inventory would be translated or transformed to show the impact on...

Author(s): Amir Hamzah Sharaai, Noor Zalina Mahmood, and Abdul Halim Sulaiman

Promotion of household renewable energy technologies in rural communities: Challenges and experiences in Sub-Saharan Africa

November 2011

It has been recognised that renewable energy technologies have an important role to play in an effort to achieve sustainable livelihoods and socio-economic development in rural communities. Several technologies ranging from wood/charcoal stoves, bio-gas digesters to solar photovoltaic’s for electricity generation are used in households and rural communities in the Sub-Saharan Africa. This paper highlights the...

Author(s): Simalenga T. E. and Maliwichi L. L.

Proposed design of anaerobic wetland system for treatment of mining waste water at former tin mining catchment

November 2011

  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...

Author(s): Muhammad Aqeel Ashraf, Mohd. Jamil Maah, Ismail Yusoff and Mohamadreza Gharibreza

Evaluation and analysis on profitability – Efficiency in hospitals affiliated with the ministry of health

November 2011

  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...

Author(s):   Yıldız AyanoÄŸlu Pekcan, Murat Atan and Umut Beylik  

Sensitivity of Schur stability of systems of linear difference equations with constant coefficients

November 2011

  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...

Author(s): A. Duman and K. Aydın

Acute, subacute toxicity and cytotoxicity of Chrysophyllum perpulchrum

November 2011

  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...

Author(s): Bidié Alain Dit Philippe, Djyh Bernard Nazaire, Yapo Adou Françis, Yapi Houphouet Félix, Zirihi Guédé Noël, N’guessan Jean David and Djaman Allico Joseph

Alteration of bus routes in large-scale networks

November 2011

  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...

Author(s): Murat Ergun and A. Sercan Kesten

InP-based multi-quantum-well mole fraction variation effects on a double wafer-fused GaAs/InP LW-VCSEL

November 2011

  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...

Author(s): P Susthitha Menon and Sahbudin Shaari

A study on thermal and electrical properties of high density polyethylene/high density polyethylene grafted maleic anhydride/ montmorillonite/ polypyrrole blend

November 2011

  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...

Author(s): Khatereh Abron, Mat Uzir B. Wahit and Sobhan Bahraeian

The investigation of dynamic performance of induction generator in different operational conditions and improving its behaviour using proper FACTS devices

November 2011

  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...

Author(s): Javad Safaee and Hamed Goodarzian

Dynamic stratigraphy of upper cretaceous in Northwest zogros (Kermanshah)-Iran

November 2011

  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...

Author(s): Mostafa Yousefi Rad

Osteoma orbitalis: A case report and literature systematic review

November 2011

  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...

Author(s): Jianyang Gong and Yehuan Sun

Prediction of nickel-based super alloy surface roughness in CNC end milling operation using connectionist models

November 2011

  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...

Author(s): Vedat TOPUZ, Mustafa AY and Gültekin BASMACI

Microsatellite gene diversity within Philippines dwarf coconut palm (Cocos nucifera L.) resources at Port-Bouët, Côte d’Ivoire

November 2011

  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...

Author(s): Konan K. Jean Noël, Koffi K. Edmond, Konan K. J. L. and Konan K.Eugene

Evaluation of the effect of nanohydroxyapatite on erosive lesions of the enamel of permanent teeth following exposure to soft beer in vitro

November 2011

  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...

Author(s): Roza Haghgoo, Farid Abbasi and Mohammad Bagher Rezvani

A critical review of nonlinear fuzzy multiple time-delay interconnected systems using the Lyapunov criterion

November 2011

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...

Author(s): Cheng-Wu Chen

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