Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2753

Table of Content: December; 4(12)

December 2009

Studies on the occurrence and quantification of phenolic endocrine disruptors in water

  Global climate change has resulted in increasing advocacy for sustainable development. With continuing decline in freshwater resources, our generation is confronted with challenges in the wise use of this important natural resource. Population growth, urbanization, industrial development and associated changes in agricultural and other land use practices are inevitable activities for economic growth....

Author(s): O. S. Fatoki and B. O. Opeolu

December 2009

Changes in elephant movement and home ranges in the Waza region, Cameroon

  Waza elephant began migrating after an ill-fated and partially remediate dam altered the hydrology and vegetation of the Waza National Park in 1980. Consequently, human/elephant clashes have been taking places. Before 1994, home ranges were 3066 km² for elephant migrating North of the park and 2484 km² for the Southern migrant cow, with the longest distance-movements computed at 80 km and 100 km...

Author(s):   Désiré Foguekem, Martin Ngankam Tchamba, Mathew LeBreton and Pierre Ngassam and Mike Loomis  

December 2009

Effect of wood moisture content on adhesion of varnish coatings

  In this research, experimental samples were prepared using Scots pine (Pinus sylvestris L.), Eastern beech (Fagus orientalis L.) and oak (Quercus petraea L.)with moisture content of 8, 12 and 15% and were coated with cellulosic (nitrocellulose), two-part polyurethane (urethanealkyd), and water-borne (self-crosslinked polyurethane) varnishes in order to determine the...

Author(s): Abdullah Sonmez, Mehmet Budakci and Mehmet Bayram

December 2009

Determination of the deflection of vertical components via GPS and leveling measurement: A case study of a GPS test network in Konya, Turkey

  Deflection of the vertical is used in reducing geodetic measurements related to geoid networks (vertical and horizontal directions observations and length measurement, etc.) to ellipsoid plane and in geoid modeling processes. Generally, it is obtained by Astro-Geodetic and gravimetric techniques. These techniques are very complex and time-consuming. Ellipsoidal coordinates of points are easily obtained thanks...

Author(s):   Ayhan Ceylan      

December 2009

Coastal legislation and administrative structure in Turkey

  Having coast on three distinct seas, Turkey is one of the rare countries in terms of its coastal length and natural, ecological and touristic richness. However, it is impossible to say that Turkey benefits this richness in the way Turkey adapts it to the future generation properly and consciously, due to the failures in legislation, frequently made changes and the incorrect and unconscious practices caused by...

Author(s): F. Ahmet Sesli, Aziz Sisman and A. Cagdas Aydinoglu

December 2009

Land use-cover change processes in Urban fringe areas: Trabzon case study, Turkey

  Urban settlements account for only two percent of the Earth’s land surface, however, over half of the world’s population resides in cities (United Nations, 2001). High population density in urban areas has resulted in a large-scale modification of the environment in urban fringe. Urbanization is a complex process of converting urban fringe and rural land to urban land uses and has caused various...

Author(s):   Cenap Sancar, Sanem Özen Turan and Ali Ä°hsan KadioÄŸullari  

December 2009

Polychotomous logistic model with missing values

  In health studies, we often face some variable missing. This missingness can happen in either response or other covariates. In this paper, the discussion focuses on missing covariates. A method is proposed for analysis of logistic regression models in which the response variable is polychotomous and some covariates’ values are missing at random. The maximum likelihood function of the model is derived...

Author(s): M. Karimlou, Gh. Jandaghi, K. Azam, A. Grami and K. Mohammad

December 2009

Macroinvertebrate-based index of biotic integrity (M-IBI) for monitoring the Nyando River, Lake Victoria Basin, Kenya

  A macroinvertebrate-based Index of Biotic Integrity (M-IBI) was developed to monitor ecological integrity of the Nyando River and its tributaries. Macro-invertebrates were sampled with a scoop net between September and December 1999 from 12 stations selected to correspond with different human activities in the catchment. The samples were hand sorted in the field, preserved in 70% alcohol before transportation...

Author(s): Phillip Okoth Raburu, J. B. Okeyo-Owuor and Frank Onderi Masese

December 2009

Stand dynamics of Kazdagi fir (Abies equi-trojani Ascher et Sinten) natural forests in Turkey

  This study has been carried out to investigate the natural distribution area of Kazdagı fir (Abies equi-trojani Ascher et Sinten) and stand dynamics of the forest in Karaköy district in the Turkey. Natural range area of this endemic species cover totally 3591.5 ha land formed by 282.5 ha pure fir stands and 3309 ha mixed with Black pine (Pinus nigra Arnold....

Author(s):   Halil Barış Özel and Mustafa Simsar  

December 2009

A novel and alternative in vitro method using microwave to study the epithelial-stromal interactions

  The goal of the present work was to obtain a simple and reproducible experimental model that would maintain the characteristics of the extracellular physiological environment of breast epithelial cells, both in factors as well as stromal structure, on which we could grow and evaluate changes of normal and tumor breast cells. 3T3-L1 pre-adipocytes (breast stromal cell model) were cultured and irradiated in a...

Author(s): Paula Alejandra Sacca, Virginia Pistone Creydt, Amelia Julieta Tesone and Juan Carlos Calvo,

December 2009

A newly defined envelope function for nano particles - carbon nano tube

  Dangling bonds on CNT (Carbon NanoTube) surface induce the spurious surface states. These dangling bonds can be bonded by incoming nano particles which is associated wave function with different characters (localization at the surface) in respect to real quantized states. When the translational symmetry is broken, we can limit the calculation to an area like a ring or a super cell. This can be...

Author(s): F. M. Nakhaei and A. Bahari

December 2009

Bivariate lognormal distribution model of cutoff grade impurities: A case study of magnesite ore deposit

  One of the most important aspects of magnesite ore deposits is for assessment of the cutoff grade impurities. The impurities in the magnesite ore deposit with grade higher than cutoff grade is waste, which is sent to the waste dump; the impurities lower than the cutoff grade are sent to the processing plant. The bivariate lognormal distribution will serve as an important tool for analysis impurities. In this...

Author(s): Suheyla Yerel and Adnan Konuk

December 2009

Impacts of common components on production system in an uncertain environment

  In this paper, the authors have investigated the effects components commonality and uncertainty in lead time, machine breakdown, etc. in a manufacturing environment. The production is characterized by multiple end items for multi-period and multi-stage dependent demand. The delivery performances, throughput of the finished products and average production time in the system are examined for different...

Author(s): M. A. Wazed, Shamsuddin Ahmed and Nukman Yusoff

December 2009

Science students’ misconceptions about birds

  The aim of this study was to determine the misconceptions of science students attending the university on the classification and behaviour of birds, and their interaction with people. For this purpose, open questions, interviews and drawing methods were directed at 110 university science students. As a result of the analysis of data obtained, it was determined that the science students surveyed had various...

Author(s): Osman Cardak

December 2009

Evaluation of initiatives for spatial information system to support Turkish agriculture policy

  Turkish agricultural policy has long been affected by the European Common Agricultural Policy. In 1992, the European Union dramatically changed its policy and since then it has been engaged in finding feasible solutions for the management of related spatial data in this context. Turkey, as a candidate country, has initiated important projects for the management of agricultural and agri-environmental measures...

Author(s): Tahsin Yomralioglu, Halil Ibrahim Inan, Arif Cagdas Aydinoglu and Bayram Uzun

December 2009

Spatial analyst methods for urban planning

  In urban planning, the development of the city for the future must be controlled. Therefore, in the city planning phase, it is necessary to plan for all events, from meteorological conditions, weather pollution, and settling to traffic accidents, according to potential future requirements. Road maps produced using statistical methods must be the base products for city planning. This study develops...

Author(s): Ismail Bulent Gundogdu

December 2009

Peoples’ response to diminishing natural resource base in the Pare-Usambara area, North Eastern Tanzania

  In a geographical area consisting of varying potentials, naturally people will tend to exploit areas where they will gain more productivity with minimum investment. However, they will move towards the marginal areas as resources become depleted in the formally high potential areas. This study is aimed at establishing how communities have responded to diminishing resource base in the Pare-Usambara area of...

Author(s): Pius Z. Yanda and Elieho K. Shishira

December 2009

Does climate change have an effect on proline accumulation in pomegranate (Punica granatum L.) fruits?

  Pomegranate is one of the oldest subtropical fruits cultivated in Turkey and surrounding areas. The country has very rich pomegranate genetic resources mostly found in semi-arid and arid areas. In this study we examined change of proline content in three well known pomegranate cultivars namely Hicaz, Oguzeli and Devedisi in year 2007 and 2008. There were wide climatic differences between years and 2008 were...

Author(s): Hanim Halilova and Nesrin Yildiz

December 2009

The health-related quality of life of the health professionals working in the primary healthcare centers and its correlation with selected sociodemographic factors in Sivas, a central Anatolian city

  The aim of this study was to assess the HRQL of health professionals in primary healthcare centers in central county of Sivas, in Turkey. This study was conducted as a cross-sectional study and 248 employees working in 19 healhcare centers were taken into the sample. Two instruments were used in this study. The first instrument included questions regarding the demographic characteristics and working...

Author(s): Nuran Guler and Firdevis Kuzu

December 2009

Allelopathic effect of Tithonia diversifolia on the germination, growth and chlorophyll contents of maize (Zea mays L.)

  The allelopathic effects of fresh shoot aqueous extract of Tithonia diversifolia(Hemsl.) A. Gray was investigated on the germination of seeds and growth of young seedlings of Zea mays L. Although the fresh shoot aqueous extract did not show significant allelopathic effect on the germination of Z. mays, however, the radicle and plumule lengths of the seedlings were significantly...

Author(s): R. O. Oyerinde, O. O. Otusanya and O. B. Akpor