Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2748

Table of Content: 30 September; 6(21)

September 2011

Routing in wireless sensor network based on soft computing technique

Wireless sensor networks consist of a large number of sensor nodes having limited power. The most important feature of these networks is the presence of dynamic topology which will lead to the mobility of the nodes. This mobility requires a routing capable of adapting to these changes. Despite the power restriction in these networks, the purpose in routing algorithm is not to find the shortest route; rather it is the...

Author(s): Samira Kalantari, Mohsen Amiri besheli, Zeinab Sam Daliri, Shahaboddin Shamshirband and Liang Shing Ng        

September 2011

Probabilistic stability analysis of Naien water transporting tunnel and selection of support system using TOPSIS approach

Tunnel stability analysis is a geotechnical engineering problem characterized by many sources of uncertainty. In such cases, rock and soil characteristics could not be defined by deterministic values and probabilistic technique would be as a suitable alternative. Naien water transporting tunnel is a circular tunnel with 6 m in diameter which is being excavated in such conditions and it is almost impossible to analyze...

Author(s): R. Rafiee, M. Ataei and M. Kamali        

September 2011

Mechanical properties of interlaminer Kevlar29 and Al2O3 powder/epoxy composite plates using an analytical approach

In this study, the behaviour of laminated composite plates, fiber Kevlar29, Al2O3powder/epoxy and the suggested analytical solution for static analysis of composite plates were presented using general classical laminated plate theory. The Navier solutions are limited to simply support rectangular plates using static analysis. The results show that the effect of the deflections and stresses on the plate...

Author(s): A. R. Abu Talib, L. H. Abbud, Aidy Ali, F. Mustapha        

September 2011

The effects of phosphoric acid and pyrolysis temperature to the formation of flaky graphite from lignite

The flaky graphites were prepared from lignite. The effects of phosphoric acid ratios and pyrolysis temperatures on flake formation were studied by SEM, TEM and XRD. The results showed that the flaky graphite occurred at a pyrolysis temperature of 600°C with a 1.0:1.0 ratio of carbon to phosphoric acid. The flaky formation was almost completed by pyrolysis at 800°C and with a 1:2.0 ratio of carbon to phosphoric...

Author(s): Sumrit Mopoung    

September 2011

Meteorological drought analysis using artificial neural networks

Droughts may be classified as meteorological, hydrological or agricultural. When meteorological drought appears in a region, agricultural and hydrological droughts follow. In this study, the standardized precipitation index (SPI) was applied for meteorological drought analysis at five stations located around the Lakes District, Turkey. Analyses were performed on 3-, 6-, 9- and 12-month-long data sets. The SPI drought...

Author(s): M. Erol Keskin, Özlem Terzi, E. Dilek Taylan and Derya Küçükyaman        

September 2011

The interdependence of electronic energy, period of time, mass and internuclear distance displayed by any object, Part 2: Molecular derivation and application to chemically alike molecules

This study, based on mere considerations induced by the Special Theory of Relativity, has previously established the following relationship between the “minimum electronic energy” , and the related “classical vibration frequency” , in regards to electronic states of a given diatomic molecule: . Where  is the reduced mass of the molecule,  the “internuclear...

Author(s): Tolga Yarman, Faruk Yarman and Fatih Özaydın        

September 2011

Usability of sand-bentonite-cement mixture in the construction of unpermeable layer

The aim of this study is to prepare a mix that can be used in impermeable fill as an alternative to clay which can sometimes be difficult to find. In the study, bentonite and cement were chosen as admixtures and sand was chosen as the main material. The main reason for choosing bentonite and cement as admixtures is that they are impermeable and easy to find. Sand was chosen as the main material in the experiments to...

Author(s): Devrim Alkaya and A. Barış Esener        

September 2011

Abdominal pain: The black box. Retrospective evaluation of patients administered to the emergency department due to complicated lymphocyt

Lymphocyst is mainly observed following extraperitoneal surgery. In this retrospective study, we aimed to determine the results of patients treated with percutaneous catheter drainage who referred to the emergency department due to lymphocyst complications. The examined group was consisted of 17 patients. All patients admitted to the emergency were suffering from abdominal pain. Ultrasonography (USG) was performed to...

Author(s): Meltem AkkaÅŸ, Türkmen Çiftci, Devrim Akınci, Nalan Metin Aksu, Müge Günalp, Figen CoÅŸkun , Erhan Akpınar , Mehmet Mahir Özmen  and Okan Akhan        

September 2011

Productivity analysis of an electronics re-manufacturing system through stochastic Petri nets and artificial neural networks

This paper provides Petri net (PN) modeling and performance analysis of a surface mount device (SMD) electronics manufacturing assembly line for an automated remanufacturing of printed circuit boards. Concentrating on the operational aspects, PN models for an automated assembly stations were constructed. These models enable designers to have a better understanding of the system control and analysis from the graphical...

Author(s): Mehmet Ali Arslan and Ismail Fidan      

September 2011

Physicochemical properties of chemically modified starches from different botanical origin

Starches from various botanical origins (rice, maize and potato starches) were cross-linked in the presence of epichlorohydrin (EPI), respectively. Then, the cross-linked starches were further oxidized with sodium hypochlorite (NaOCl, 2.5% w/w) to obtain oxidized cross-linked starches (OCS). The chemically modified methods on the physicochemical properties of different starches were investigated. It was found that...

Author(s): Huaxi Xiao, Qinlu Lin, Gao-Qiang Liu, Yue Wu, Wei Tian, Wei Wu and Xiangjin Fu        

September 2011

Neuroendocrine regulatory role of Merkel cells in the pathogenesis of psoriasis

It has been confirmed that neuroendocrine regulation involves in the pathogenesis of psoriasis, but the association between neuroendocrine and skin immune is still unknown. The present study aimed to explore the relationship of Merkel cells in the skin lesions and the pathogenesis of psoriasis. The ultrastructure of Merkel cells was observed under an electron microscope and immunohistochemistry was performed to detect...

Author(s): Taihua Liu, Defang Liu, Xiaoxiang Wang, Jun Wang, Xiaojun Wang and Zhongkui Zhang        

September 2011

Injection moulding temperature and powder loading influence to the metal injection moulding (MIM) green compact

The influence of temperature and powder loading on the Metal Injection Moulding (MIM) green compact is presented. The feedstock used is a mixture of stainless steel (SS316L) powder and a composite binder system consisting of polyethylene glycol (PEG) and polymethyl methacrylate (PMMA). The bi-modal particle size distribution powder has a composition of 30 and 70% by weight of fine and coarse SS316L powder respectively...

Author(s): Khairur Rijal JAMALUDIN, Norhamidi MUHAMAD, Sufizar AHMAD, Mohd Halim Irwan IBRAHIM, Nor Hafiez MOHD NOR and Yusof DAUD        

September 2011

Acid treatment of platelets for removal of class I human leukocyte antigen (HLA) antigens

Acid elution of platelets class I human leukocyte antigen (HLA) antigens is considered as a strategy for production of HLA-eluted platelets for clinical use. In this study, we investigated the effects of acid treatment for the removal of class I HLA antigens on platelet activation, apoptosis and aggregation, and to evaluate the optimal elution condition and the feasibility of clinical application of the acid-elution...

Author(s): Yong Zou, Xiangfu Liu, Sihong Liao, Wenda Liu, Ying Lu, Xueling Tan, Fang Li, Qing Yuan, Guilian Liu, Zhesheng Lin, Jiefang Li and Dongjun Lin,        

September 2011

Study on differences between Chinese and Western sciences and their causes

Science constitutes the theoretical foundation of technological innovation. And science develops on the basis of specific philosophical thoughts and cultural gene. The differences between Chinese and western philosophies and cultures determine the differences of their sciences. Some inspirations are offered based on profound analysis of the differences and the root cause of the development of Chinese and Western...

Author(s): Wang Xiuhong, Qian Zhaohua and Su Gengsheng        

September 2011

Engineering properties of Turkish travertines

The usage of Turkish travertines is becoming increasingly popular as a natural building and facing stone in construction and engineering sector all over the world. Chemical, physical and mechanical properties of travertine play an important role on deciding their application area as a construction stone. In this study, the travertine samples were obtained from 15 different provinces and 23 different quarries in the...

Author(s): Y. ErdoÄŸan      

September 2011

Prediction of subgrade resilient modulus for flexible pavement design

Resilient modulus of subgrade soils is an important input in mechanistic pavement design. The primary objective of this work is to investigate the resilient modulus of four typical Victorian fine-grained subgrade soils under traffic-like repeated loading and to suggest empirical predictive models incorporating physical properties and/or strength of the soils along with the stress state. A repeated load...

Author(s): Mehmet Ridvan Ozel and Abbas Mohajerani      

September 2011

Strengthening of reinforced concrete (RC) beams with prefabricated reinforced concrete (RC) plates

Reinforced concrete (RC) beams which are insufficient in terms of shear and flexural capacities are strengthened by various methods. Steel and fibre reinforced polymer (FRP) plate bonding methods are very widely used in strengthening of beams. Strengthening methods such as bonding steel and FRP plates have deficiencies as corrosion, fire and buckling. In this work, it is aimed strengthening of damaged RC beams using...

Author(s): A. Demir and M. Tekin        

September 2011

Hybrid strategies of enumeration in constraint solving

Enumeration strategies (that is, selection of a variable and a value of its domain) are crucial components of Constraint Programming: they significantly influence the performances of the solving process, sometimes of several orders of magnitude. In this paper, we propose to use Local Search in order to help and guide enumeration: we extend the usual variable selection strategies of constraint programming and we perform...

Author(s): Eric Monfroy, Broderick Crawford, Ricardo Soto, and Fernando Paredes        

September 2011

Effects of water and salt stresses on germination and seedling growth in two durum wheat (Triticum durum Desf.) genotypes

To evaluate durum wheat (Triticum durum Desf.) tolerance to osmotic stress at the water potential levels induced by polyethylene glycol 6000 and NaCl solutions at an early stage of plant growth. Each, on germination and early seedling stages, were investigated for two durum wheat genotypes differing in drought tolerance (boefi and leucurum) at laboratory, in Iran in 2010. This investigation was performed as...

Author(s): Majid Khayatnezhad and Roza Gholamin        

September 2011

Nutritional status in school children: Deficiencies in iron, folic acid and Vitamin B12

This study was conducted to assess deficiencies in iron, folic acid and Vitamin B12as well as nutritional status in a sample of school-age children in Turkey. The study was conducted on 172 children (boys: 80; girls: 92) aged 6 to 13 years from two different primary schools in the capital city of Turkey, Ankara. Data were obtained on children anthropometry, 24 dietary recalls, hematological and biochemical parameters of...

Author(s): Eda Koksal, Aylin Ayaz, Ozge Kucukerdonmez and Naile Bilgili        

September 2011

A thermosolar nursery for tilapia (Oreochromis niloticus L.)

A thermosolar nursery development for rural producers was built and tested in three different operational conditions. The system consisted of a solar collector connected to a coiled heat exchanger inside a fish culture tank. A pump activated by two thermostats was used to circulate water throughout the heating circuit. A short-term pilot test was performed to probe the maximum heating of the system. Two more tests...

Author(s): Oscar Alatorre-Jácome, Enrique Rico-García, Genaro M. Soto-Zarazúa, Fernando García-Trejo and Gilberto Herrera-Ruiz      

September 2011

A case study about the experimental works on the production of repair mortars to be used in the restoration of Anemas Dungeons

In this paper, the experimental studies conducted to produce repair mortars with local materials for the restoration of Anemas Dungeons located in Ayvansaray-Halic site of Istanbul Land Walls were explained and the results were evaluated. Before these studies, characterization studies of original mortar samples collected from the structure were conducted in detail, then the repair mortar samples were produced in...

Author(s): Seden Acun Ozgunler    

September 2011

Role of time-density curve of ct enhancement in combination with pathological examination in the diagnose of lung cancer

The study aimed to investigate the relationship between the expressions of cyclooxygenase-2 (COX-2), vascular endothelial growth factor (VEGF), microvessel density (MVD) and the appearances on enhanced CT scan in lung cancer patients. Findings on dynamic CT scan were evaluated respectively in 35 patients without lung cancer (control) and 25 lung cancer patients receiving chemotherapy or radiotherapy followed by complete...

Author(s): Fei Wang, Bailu Liu, Linyou Zhang, Dazhong Liu, Yiping Zhao, Shengjie Shu, Yinglin Guo and Yanming Zhao        

September 2011

Gastrojejunocolic fistula after gastroenterostomy with Billroth II reconstruction for duodenal ulcer: Report of a case

Gastrojejunocolic fistula is a late, rare and severe complication of gastroenterostomy with Billroth II reconstruction for peptic ulcer and is associated with inadequate gastric resection and incomplete vagotomy. The fistula is thought to be due to perforation of a marginal ulcer into the transverse colon. In the past, attempted primary repair had high mortality and staged operations were normally performed. We herein...

Author(s): Yin-Lu Ding, Yong Zhou and Jian-Liang Zhang        

September 2011

Computer aided analysis of phase to ground fault for generators operated in parallel with networks

Maximum and minimum short circuit currents must be calculated before installing an electric system. The maximum short-circuit current corresponds to a short-circuit in the immediate vicinity of the downstream terminals of the protection device. It must be calculated accurately and used within a safety margin. A minimum short-circuit current is essential when selecting a time-current curve for the circuit breakers and...

Author(s): Nuran Yörükeren and Musa Uçan        

September 2011

Assessment effect of granulocyte colony-stimulating factor in experimental models of liver injury

Previous investigators have suggested that granulocyte colony-stimulating factor (G-CSF) may accelerate the healing process of liver lesions. This hypothesis has been discussed by some researchers. The action mechanisms remains unclear and further studies are needed to clarify this mechanism. To test this, we establish a rat model of liver injury using dimethylnitrosamine (DMN), transplanted the G-CSF into the rats. To...

Author(s): Durdi Qujeq, Roya Abassi, Farideh Faeizi, Hadi Parsian, Alieh Faraji, Maryam Elmei, Mohsen Tatar, Sohrab Halalkhor  and Hassan Tahhery        

September 2011

Bibliographic and citation analysis of publications from a Thai Research Institute with a defined lifespan: The Institute of Molecular Biology and Genetics, 1999 to 2009

This study sought to explore the research output of a single research institute in Thailand with a defined life span (1999 to 2009) and to assess the impact of this research through the use of citation analysis. A total of 228 primary research articles met the inclusion criteria (indexed primary research publication) with a combined total of 1696 published pages. Average article length was 7.43 pages. The average impact...

Author(s): Anchalee Nirachanon and Duncan R. Smith        

September 2011

A decision support model to incorporate public and expert opinions for assessing the privatization of public bus transit system: Application of ELECTRE for the bus system in Eskisehir, Turkey

This paper proposes a multicriteria model for assessing public bus operation systems based on the ELECTRE method in the city of Eskisehir, Turkey. In this specific problem, public and expert opinions towards the privatization of urban bus lines were collected through a comprehensive survey to determine the best operation system; either by the local authority or private operators. The data collected include the opinions...

Author(s): Nadir Yayla and Murat Karacasu