Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2733

SRE Articles

August 2015

The time delayed feedback control to suppress the vibration of the autoparametric dynamical system

The response of a dynamical system of two-degree-of-freedom with parametrically excited pendulum is solved and studied. The delayed feedback control is applied to suppress or stabilize the vibration of the system. The case of 1:2 sub-harmonic resonances between pendulum and primary system is studied; the method of multiple scales is applied to obtain second-order approximations of the response of the system. It is shown...

Author(s): Yasser A. Amer and Samira M. Soleman

August 2015

Evaluation of agro-ecological approach to soil quality assessment for sustainable land use and management systems

Long-term cultivation of crops has been found to cause soil physico-chemical and biological quality (SQ) degradation for sustainable agricultural production practices in Akwanga, Nigeria. Understanding the dynamics of SQ change under different land use types is desired. The present study was carried out to assess soil physico-chemical indicators (based on land evaluation approach) and biological SQ (based on...

Author(s): Peter Ikemefuna Ezeaku

July 2015

Structural damping identification using a recursive Kalman filter

Much research has been done in developing techniques for identifying the structural damping of physical systems. Such techniques are always accompanied by the development of an analytical model of the ideal system and its comparison with experimental data obtained in laboratory. Also, flexible systems are difficult to be modeled, but the authors can use an approximation, supposing that a flexible system, composed by a...

Author(s): Bruna Tavares Vieira da Silva, Álvaro Manoel de Souza Soares, and João Bosco Gonçalves

July 2015

Impact analysis of front line demonstration of rice (Oryza sativa) on the yield, economics and farmer’s knowledge in temperate region of India

Impact analysis of Front Line Demonstrations (FLD’s) of rice on yield, economic returns, level of knowledge and adoption extent was conducted through a study in temperate region of northern India, in which 240 participating farmer respondents and 240 non-participating farmer respondents from 5 representative villages in four districts were selected through stratified random sampling method for the purpose. Based...

Author(s): Beigh M. A., Rufaida Mir S. Z. A., Matoo J. M. and Sibat F. K.

July 2015

Purification and biochemical characterization of extracellular manganese peroxidase from Ganoderma lucidum IBL-05 and its application

In this study an extracellular manganese peroxidase (MnP) was isolated from culture filtrate of an indigenous fungal strain Ganoderma lucidum IBL-05 under static conditions using wheat bran as substrate. The enzyme was purified by applying successively ammonium sulphate precipitation, dialysis, ion exchange and gel filtration chromatographic techniques. Purification procedure resulted in 3.43-fold purification with...

Author(s): Muhammad Bilal, Muhammad Asgher and Muhammad Ramzan

July 2015

Effect of magnesium fertilization on some plant nutrient interactions and nut quality properties in Turkish hazelnut (Corylus avellana L.)

Plant nutrient interactions and fertilization is one of the most important factors affecting the quality of hazelnuts. This study aimed to determine the relationships between some plant nutrients and some hazelnut quality criteria and yields. The trial was carried out at Tombul hazelnut orchards in Hazelnut Research Station between 2009 and 2011. The trial was designed as randomized complete blocks of magnesium nutrient...

Author(s): Nedim ÖZENÇ and Damla Bender ÖZENÇ

July 2015

Growth, optical, thermal and electrical properties of nonlinear optical -glycine single crystal

Single crystal growth of γ-glycine has been grown by solution growth technique. The lattice parameters and crystal system of the grown crystals were confirmed by single crystal X-ray diffraction analysis. The functional groups present in the grown crystal were identified by FT-IR spectral analysis. The optical property of the γ-glycine crystal is studied by UV-Visible spectrum. Optical constants such as band...

Author(s): N. Nithya, R. Mahalakshmi and S. Sagadevan

July 2015

Investigation of premature fracture of a tail pulley in the field

An unexpected (premature) failure happened in Tail Pulley during operation in field. Consequently, a complete analysis in terms of fracture and fatigue performed. The analysis aimed to determine the failure root-cause by the analysis of the project and materials. The analysis covered the tensions undergone by the pulleys under operation and the material´s mechanical strengths. The results showed the project...

Author(s): J. A. Martins, I. Kövesdy, E. C. Romão and I. Ferreira

June 2015

Seasonal incidence of major insect- pests and their biocontrol agents of soybean crop (Glycine max L. Merrill)

The major insect-pests observed attacking soybean variety JS 335 were girdle beetle, Obereopsis brevis; tobacco caterpillar, Spodoptera litura; green semilooper, Chrysodeixis acuta; whitefly, Bemisia tabaci and jassids, Empoasca kerri. The peak activity of girdle beetle (1.0 damaged plant per meter row) was observed during first week of October. Whereas the peak activity of caterpillar pests that is, S. litura (2.5...

Author(s): Rambihari Ahirwar, Payal Devi and Rajeev Gupta

June 2015

Comparative performance of some bivoltine silkworm (Bombyx mori L.) genotypes during different seasons

Twenty-six bivoltine silkworm (Bombyx mori L.) genotypes were tested along with two check varieties (NB4D2 and SH6) for their performance in respect of 14 metric traits during spring (E1) and summer (E2) seasons. No genotype displayed significantly superior performance vis-à-vis check breeds in all the metric traits under study. However, several genotypes registered higher performance in several subsets of...

Author(s): A. Maqbool, H. U. Dar, M. Ahmad, G. N. Malik, G. Zaffar and S. A. Mir and M. A. Mir

June 2015

Performance of summer sesame (Sesamum indicum L.) cultivars under varying dates of sowing in prevailing agro-climatic condition of North Bengal

To study the effect of dates of sowing and improved cultivars on growth and yield of summer sesame in North Bengal five different dates of sowing (10th February, 20th February, 2nd March, 12th March and 22nd March and three cultivars of sesame (Rama, Savitri and Tillotama) with three replications.  The highest (114.66 and 115.83 cm) plant height was recorded when sesame sown on 12th March (D4) and which was...

Author(s): Saikat Chongdar, Anando Singharoy, Ashok Saha and Binoy Chhetri

June 2015

Effect of pre-harvest foliar spray of calcium and potassium on fruit quality of Pear cv. Pathernakh

Growing costs of fertilizers and increasing concern about ground water pollution has resulted indiscriminate or excessive soil fertilization problem that may be solved by more efficient fertilizer application technologies. The availability of new promising oriental pear or Japanese pear [Pyrus pyrifolia (Burm) Nakai] cultivar like ‘Patharnakh’, pave an opportunity for extending its cultivation under tarai...

Author(s): B. Prasad, D. C. Dimri and L. Bora

June 2015

Analysis of cavitating flow through a venturi

A dynamical study of a bubbly flows in a transversal varying section duct (Venturi), is modeled by the use of the mass and momentum phases equations, which are coupled with the Rayleigh-Plesset equation of the bubbles dynamics. The effects of the throat dimension and the upstream void fraction on flow parameters are investigated. The numerical resolution of the previous equations set let us found that the...

Author(s): Mohammed ZAMOUM and Mohand KESSAL

June 2015

Genetic divergence in some bivoltine silkworm (Bombyx mori L.) breeds

Twenty-eight genotypes of bivoltine silkworm (Bombyx mori L.) were studied for genetic divergence using Mahalanobis D2 statistic. Based on fifteen important metric traits, D2 values were obtained and the genotypes were grouped into five clusters using Tocher’s method. The clustering pattern indicated a mixed trend. The silkworm genotypes originating/evolved from different geographical regions fell in the same...

Author(s): A. Maqbool, H. U. Dar, M. Ahmad, G. N. Malik, G. Zaffar and S. A. Mir

June 2015

Larval stage of trematodes obtained from brackish water snails in the central and east coast of the gulf of Thailand

Brackish water snail is one of the important intermediate hosts of trematode infections. This kind of snail along the Gulf of Thailand were examined for cercariae, the larval stage of trematodes. The aim of this study was to investigate cercarial infections in brackish water snails in the central and eastern side of the Gulf of Thailand. Snails were collected from 45 sampling sites (20 central areas, 25 eastern areas),...

Author(s): Suluck Namchote, Supatta Sritongtae, Siriphon Butnin, Paporn Wongwain and Duangduen Krailas

May 2015

The mating behaviour of the banana weevil, Cosmopolites sordidus Germar (Coleoptera : Curculionidae)

The banana weevil, Cosmopolites sordidus Germar mates repeatedly in its lifetime. No elaborate courtship behavior was seen before mating in the laboratory. However, ‘sniffing’ (an activity by which male weevils used their antennae to contact the abdominal tip of the female, as if to perceive some stimulus), often preceded mating. This observation may be an indication of a chemical pheromone involved in the...

Author(s): Richard P. Uzakah and Johnson A. Odebiyi

May 2015

Etio-pathological investigations to study the gross and histopathological lesions affecting gastrointestinal tract of sheep

Thirty sheep/lambs were brought for post mortem in Teaching Veterinary Clinical Complex, LUVAS and Central Sheep Breeding Farm, Hisar, which were investigated for gastrointestinal tract pathology in laboratory of Department of Veterinary Pathology. Mortality was maximum in sheep/lambs of age group 6 months to 1 year and higher in males than females. Gross pathological changes in gastro intestinal system noticed were...

Author(s): S. Kumar, K. K. Jakhar and A. D. Singh

May 2015

Investigations on the photoconductivity studies of ZnSe, ZnS and PbS thin films

Zinc selenide (ZnSe), zinc sulphide (ZnS) and lead sulphide (PbS) thin films were prepared by chemical bath deposition (CBD) method. In this paper we report results on the photoconductivity behaviour of ZnSe, ZnS and PbS thin films. Photoconductivity measurements were carried out at room temperature by connecting it in series with a picoammeter (Keithley 480) and a dc power supply. Photoconductivity processes may be the...

Author(s): S.Thirumavalavan, K. Mani and S. Sagadevan

May 2015

Evaluation for nutritive values and antioxidant activities of dried seablite (Suaeda maritima)

The aims of these studies were to evaluate nutritive values of dried seablite (Suaeda maritima) and investigate its biological characteristics on health promotion, such as, antioxidant activities. Edible parts were collected, dried with solar stove, determined nutritive values, including proximal analysis of water content, crude protein, crude fat, dietary fiber, total ash content, carbohydrate, total calories,...

Author(s): Yuttana Sudjaroen

May 2015

Regression analysis of pavement surfaces textures on noise pollution

Noise is one of the physical environmental factors affecting human health in today’s world. Pavement surface texture affects many vehicle and road characteristics; therefore, efforts are needed to develop more advanced techniques for evaluating pavement texture. The selection of an appropriate pavement as the best method to control the main cause of road noise, the sound absorption resulting from contact wheel...

Author(s): Ali Mansour Khaki, Amir Esmael Forouhid, Mehdi Zare and Amirali Pirbastami

May 2015

Agriculture germplasm resources: A tool of conserving diversity

Three major physical resources in the world comprise land, water and the biological diversity. Agricultural biodiversity is an important component of biodiversity, which has a more direct link to the well being and livelihood of mankind than other forms of bio¬diversity. In fact, it is one of our most fundamental and essential resources, one that has enabled farming systems to evolve since the birth of agriculture...

Author(s): Rukhsar Ahmad Dar, Mushtaq Ahmad, Sanjay Kumar and Monica Reshi

May 2015

Approximate solution to three point bending equation for a simply supported beam

In this work, the authors present an approximate solution to three point bending equation for a simply supported beam of rectangular section. The deflection of the beam due to a perpendicular point – wise load is estimated for high rates of its curvature. After the deformation of the beam, the shape of its cross sectional area is assumed to remain as is. The proposed solution consists of binomial power series and...

Author(s): J. C. Venetis and E. P. Sideridis

April 2015

Alterations on the plasma concentration of hormonal and non hormonal biomarkers in human beings submitted to whole body vibration exercises

Vibration is a mechanical stimulus that is characterized by an oscillatory motion. When there is a direct contact of a person, in general standing on the base of this type of platform, the vibration that is produced in these machines is transmitted to the body of the subject producing whole body vibration (WBV) exercises. Biological effects can be associated with the WBV exercises with desirable and undesirable...

Author(s): Danúbia da Cunha Sá-Caputo, Eloá Moreira Marconi, Rebeca Graça Costa-Cavalcanti, Laisa Liane Domingos, Paula Mantilla Giehl, Dulciane Nunes Paiva, Nasser Ribeiro Asad, Pedro Jesus Marin and Mario Bernardo-Filho

April 2015

Enhancing germination and seedling vigour in cluster bean by organic priming

The experiment was conducted at Department of Seed Science and Technology, Agricultural College and Research Institute, Madurai during 2014-2015, to find out the effect of organic seed priming with cow urine at different concentrations. The cluster bean seeds were soaked for 3 h with different concentrations viz., 2, 4, 6, 8 and 10% along with water and control (no treatment). The seed quality parameters viz., speed of...

Author(s): S. Ambika and K. Balakrishnan

April 2015

Group balanced block design for comparisons among oilseed Brassicae

The brassica genus contains the most genetically diverse collection of agriculturally important plant species, including oilseed, mustard and cruciferous species. Comparisons for seed yield and its components were drawn among brown (Brassica rapa var. brown sarson), gobhi (Brassica napus) and yellow sarson (B. rapa var. trilocularis). Brown sarson was found high yielder by virtue of its high siliquae number per plant...

Author(s): A. B. Shikari, G. A. Parray, N. R. Sofi, A. Hussain, Z. A. Dar and A. M. Iqbal

April 2015

Genotype-environment interaction and stability analysis in Wheat (Triticum aestivum L.) for protein and gluten contents

Genotype-environment interaction and stability performance were investigated on protein and gluten contents in three environments. Genotypes showed important differences in quality values as reflected in the AMMI (additive main effects and multiplicative interaction) analysis biplot result. The protein content showed the similar trend of GE interaction as that of grain yield. The genotype G1 was tightly grouped with E3...

Author(s): N. Saleem, M. Ahmad, S. A. Wani, R. Vashnavi and Z. A. Dar

April 2015

Fertigation through trickle and micro sprinkler on flowering characters in cocoa (Theobroma cacao L.)

An experiment was conducted during 2010 and 2011 to investigate the impact of fertigation on flowering characters of cocoa at Tamil Nadu Agricultural University, India. The study was laid out in randomized block design with thirteen treatment combinations replicated thrice. The study shown that, fertigation with 125% recommended fertilizer dose as water soluble fertilizer through fertigation by micro sprinkler...

Author(s): C. Krishnamoorthy, K. Rajamani, S. Mekala and S. Rameshkumar

April 2015

Production of particleboards from licorice (Glycyrrhiza glabra) and European black pine (Pinus Nigra Arnold) wood particles

In this study particleboards were manufactured from mixtures of licorice (Glycyrrhiza glabra) and European Black Pine (Pinus nigra Arnold) wood particles at several ratios. The suitability of licorice (Glycyrrhiza glabra) chips for particleboard production was examined. Urea formaldehyde resin was used as a binder in 3-layers particleboards. The manufactured boards were tested according to European (EN) standards. The...

Author(s): Cengiz GULER

April 2015

An enhanced requirements elicitation framework based on business process models

Requirements elicitation is a central and critical activity in the requirements engineering process. Completeness is among the most difficult challenges facing requirements engineers. Missing requirements is one of the major causes of software failure; they often result from the lack of anticipation of all possible relations between elements of the system-to-be. In this paper, we propose a requirements elicitation...

Author(s): Rana Yousef and Tamara Almarabeh

March 2015

Evaluation of pavement noise emission model: A case study in Tehran

Noise pollution and its influence on environment and life quality of human beings may be considered as a hot topic in scientific research. Since there are no sufficient studies on noise pollution in Tehran, this study was carried out to determine noise levels of pavement in Tehran City. SMM1 (The first standard of noise measurement method) model is one of the most common models used in calculating noise emission in...

Author(s): Ali mansour khaki, Amir Esmael Forouhid and Hootan Chegini

March 2015

The -expansion method and the exp -expansion method with applications to a higher order dispersive nonlinear Schrödinger equation

In this article, we study the connection between the -expansion method and the exp -expansion method with the aid of a suitable transformation. We employ these two methods to derive families of exact solutions for a higher order dispersive nonlinear Schrödinger equation describing the propagation of the optical pulse in a medium. Comparison between these two methods is presented. We show that the two methods as...

Author(s): Elsayed M. E. Zayed, Yasser A. Amer and Reham M. A. Shohib

March 2015

Antifungal activity of aqueous and ethanol extracts of seaweeds against sugarcane red rot pathogen (Colletotrichum falcatum)

The study was carried out to evaluate the effect of seaweed extracts of Sargassum myricocystum (brown alga) and Gracilaria edulis (red alga) against the mycelial growth of Colletotrichum falcatum with different extraction methods of aqueous and ethanol at concentrations of 5 and 10% along with control by poison food technique. The result revealed that extract of S. myricocystum (ethanol extract) showed significant...

Author(s): S. Ambika and K. Sujatha

March 2015

Improved production of β-galactosidase and β-fructofuranosidase by fungi using alternative carbon sources

The influence of alternative carbon sources as inducers of -galactosidase and -fructofuranosidase by filamentous fungi (that are, Aspergillus aculeatus, Chrysonilia sitophila, Gliocladium virens, Aspergillus fumigatus and Trichoderma longibrachiatum), recently isolated from Brazil’s Atlantic Forest biome has been investigated. The greatest levels of intracellular β-galactosidase activity were obtained using...

Author(s): Diandra de Andrades, Vanessa Cristina Arfelli, Alesandra Oriente, Caroline Henn, Veridiana Araujo Alves da Costa Pereira, Rita de Cássia Garcia Simão, Jose Luis da Conceição Silva and  Marina Kimiko Kadowaki

March 2015

Algorithm for wavelength assignment in optical networks

Wavelength division multiplexing (WDM) is a technology which multiplexes many optical carrier signals onto a single optical fiber by using different wavelengths. Wavelength assignment is one of the important components of routing and wavelength assignment (RWA) problem in WDM networks. In this article, to decrease the blocking probability, a new algorithm for wavelength assignment- Least Used Wavelength Conversion...

Author(s): Gulzar Ahmad Dar, Ifrah Amin and Hardeep Sing Saini

March 2015

The law of symmetry and its application

In this paper, the content of the law of symmetry and its application in science and production is introduced. It emphasizes the law`s effect on scientific law.   Key words: Symmetry principle, scientific law, translation variant, symmetry, geometrical, rotational.

Author(s): Yang Hongyu, Huang Chunyi, Wang Zhiyang, Lin Ying and Zhang Shue

March 2015

Evaluation of potential application of micromagnetic techniques for detection of corrosion in reinforced concrete

Despite the constant development of new materials, reinforced concrete is still widely used in civil engineering. Corrosion of the steel armour in reinforced concrete structures has historically been one of the main causes of damage and early failure. The development of a reliable method of non-invasive corrosion inspection and evaluation has been a challenge for many years. This paper focused on magnetic inspection of...

Author(s): Carlos Henrique de Carvalho, Carlos Otávio Damas Martins, Sandro Griza, Thomas Gabriel Rosauro Clarke and Ledjane Silva Barreto

March 2015

Front line demonstrations on need based plant protection in pulses for enhancing productivity and profitability under farmer’s condition

Pulses have high nutritional value and worldwide commercial importance because these are rich source of protein and fibers. The productivity of pulses is lower in comparison to potential yield due to several biotic and abiotic stress. To show the productivity potential and profitability of need based plant protection in pulse crops (Black gram, Pigeonpea, Gram, pea and Lentil) total 74 front line demonstrations (FLDs)...

Author(s): A. K. Tripathi, K. S. Yadav & V. P. Srivastava

March 2015

A study on current status of herbal utilization in Bulgaria: Part 1 - Application of herbal medicines

Despite increasing interest in phytotherapy, little is known about patterns of herb utilization in modern society. Ethnobotanical studies are useful tool to evaluate the dynamics of traditional knowledge. To our knowledge, there is no study focused on collection of information about herbal utilization from a wide range of people in Bulgaria. 1) the attitudes toward benefits of medicinal plants; 2) the most popular...

Author(s): Asya Pencheva Dragoeva, Vanya Petrova Koleva, Zheni Dimitrova Nanova, Teodora Veselinova Koynova and Pavlina Kalcheva Jordanova

March 2015

Antimicrobial activity and phytochemical screening of crude water extract of the stem bark of Ficus glumosa.

Water and methanol extracts of the stem bark of Ficus glumosa were screened for their antimicrobial properties against Salmonella species. Preliminary results showed that the active compound was in the water extract. Therefore, the water extracts (hot and cold) were subjected to column chromatographic fractions and antibacterial screening. The most active fraction was subjected to phytochemical screening and finally Gas...

Author(s): H. A. Kwazo, U. Z. Faruq, S. M. Dangoggo, B. S. Malami and D. O. Moronkola

March 2015

Sharing healthcare information based on privacy preservation

The evolution and development of information technology have facilitated greater sharing of data and knowledge management for the collection of electronic information by data owners such as governments, corporations, and individuals. Therefore, they have created huge opportunities for knowledge management and information retrieval. Recent develoments have helped improve decision making especially in the fields of...

Author(s): Asmaa Hatem Rashid and Norizan Binti Mohd Yasin

March 2015

A review on cashew research and production in Nigeria in the last four decades

Cashew (Anacardium occidentale L.); a tropical nut tree crop, is a source of food, income, industrial raw materials and foreign exchange for many countries of Africa, Asia and Latin America. In Nigeria, current cashew trading and exports is worth 24 billion naira ($160 million) and over one million people depend on the industry. Commercial cultivation of cashew in Nigeria dates back to more than 60 years, while research...

Author(s): Adeigbe O. O., Olasupo F. O., Adewale B. D. and Muyiwa A. A.

February 2015

High sensitive C-reactive protein (hs-CRP) level and lipid profiles of healthy volunteers with prehypertension

Coronary atherosclerosis still represents one of the main causes of death. Efficacious prevention should focus on early control of cardiovascular risk factors, including lipid profiles, which unable detect on sub-clinical cases. High-sensitive C-reactive protein (hs-CRP) can prove to be an early cardiac risk predictor. Aims of this study were to compare hs-CRP levels between healthy volunteer with normal blood pressure...

Author(s): Yuttana Sudjaroen

February 2015

Production of laccase from a white rot fungi isolated from the Amazon forest for oxidation of Remazol Brilliant Blue-R

The purpose of this study was to investigate the production of laccase from a white rot fungi isolated from the Amazon forest for oxidation of Remazol Brilliant Blue-R (RBB-R). Initially, a small screening was carried out aiming to find laccase producers. The next step was to investigate, using factorial design and Response Surface Methodology (RSM), the influence of the content of glucose, peptone and CuSO4 in the...

Author(s): Yago Vinícius Serra dos Santos, Davi Almeida Freire, Silviane Bezerra Pinheiro, Luciane Fontão de Lima, Joao Vicente Braga de Souza and José Renato Pereira Cavallazzi

February 2015

Investigations on optimum possibility of replacing cement partially by redmud in concrete

Red mud is an industrial waste material generated during production of alumina from bauxite by Bayer process. These industrial wastes hold some heavy metals which are hazardous in nature. The aim of the paper is to investigate the possibility of partially replacing Portland cement in concrete by red mud and evaluating its compressive and splitting tensile strength. This study examines the effect of red mud on the...

Author(s): D. Linora Metilda, C. Selvamony, R. Anandakumar and A. Seeni

February 2015

Proposition of a low cost field assay to determine antiproliferative properties of indigenous plants using Dugesia dorotocephala (brown planaria)

Cancer is a major health problem, not only in developed countries, but also in developing countries where the number of cancer-related ailments is growing. Chemotherapy is the most commonly used treatment option but side effects associated with its use necessitates the search for alternatives. Over 80% of the population in developing countries relies on ethnomedicinal plants for primary healthcare including cancer....

Author(s): Florence Dushimemaria and Davis R. Mumbengegwi

February 2015

Tracheal relaxant effect of aqueous-methanol leaf extract of Rumex vesicarius L. in rabbits

Rumex vesicarius L. has traditionally been used in folkloric medicine to manage respiratory disorders. The present study was designed to evaluate the effect of aqueous-methanol extract of R. vesicarius on isolated rabbit tracheal preparations, an attempt to validate its folkloric use in traditional medicine for respiratory ailment. The application of the extract to isolated rabbit tracheal preparations relaxed...

Author(s): Imran Ahmad Khan, Khalid Hussain Janbaz, Abdul Aziz, Muzammal Sattar, Shaukat Hussain Munawar, Zahid Manzoor, Muhammad Asif Raza, Ghayoor Fatima and Abdul Hannan

February 2015

Investigation of resonance characteristics and effective parameters of a metamaterial structure with split rings

This paper presents a new metamaterial, based on SRR structure and systematically investigate the various properties of the metamaterial structure. The resonant frequency of the proposed metamaterial structure is first estimated using its equivalent circuit model and the estimated value thus obtained is then compared with the values obtained by High Frequency Structure Simulator (HFSS) simulations. The negative...

Author(s): R. Singh, N. Kumar and S. C. Gupta

February 2015

Exact solutions for the nonlinear KPP equation by using the Riccati equation method combined with the G'/G - expansion method

The improved Riccati equation method combined with the improved  - expansion method is an interesting approach to find more general exact solutions of the nonlinear evolution equations in mathematical physics. The objective of this article is to employ this method to construct exact solutions involving parameters of a nonlinear Kolmogorov-Petrovskii-Piskunov (KPP) equation. When these parameters are taken to be...

Author(s): Elsayed M. E. Zayed and Yasser A. Amer

February 2015

Effects of a Tabebuia avellanedae extract and lapachol on the labeling of blood constituents with technetium-99m

Tabebuia avellanedae extract has been used in folk medicine in the treatment of some clinical disorders. Lapachol is an active compound from this medicinal plant. The procedure of labeling of blood constituents with technetium-99m (99mTc) could be used as an in vitro assay to evaluate some properties of natural and synthetic drugs. The aim of this work was to evaluate the effect of a T. avellanedae extract and lapachol...

Author(s): Ana Cristina da Silva Braga, Maria Luisa Gomes, Joelma Fonseca de Oliveira Fernandes, Nasser Ribeiro Asad, Sebastião David Santos-Filho, Carlos Alberto Sampaio Guimarães, Eric Heleno Freire Ferreira Frederico, and Mario Bernardo-Filho

February 2015

Determination of the priority areas for the rehabilitation of degraded forest lands

Turkey has more than 21.67 million ha forest areas and 10.11 million ha of these forest areas are still degraded or highly degraded in 2012 year. These areas can only be transformed into a productive state with implementation of rehabilitation treatments. Determination of the priority of degraded forest areas for the rehabilitation is important issue and affected by many parameters in Turkey. Some important indicators...

Author(s): Ali İhsan KADIOĞULLARI and İbrahim TURNA

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