Metabuscador

Filtrado por:

Temas

Idiomas

Inglés (30)
Más...

Año

2012 (30)
Más...

Aproximadamente 30 registro(s) hasta el momento: (journal)

Mostrar 10 | 50 | 100 resultados por página

Recurso libre

A Simple Alternative Method for the Synthesis of Aromatic Dialdehydes
Gamze KOZ - Demet ASTLEY - Stephen Thomas ASTLEY

Formato:
Enlaces:	Aromatic dialdehydes were synthesized from 5-t-butylsalicylaldehyde and o-vanilline in good yields using paraformaldehyde, hydrobromic acid and catalytic amounts of sulfuric acid in one step which was previously unavailable with present methods. Key Words: aromatic dialdehydes, bromomethylation, 5-t-butylsalicylaldehyde, o-vanilline.
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

Novel and Efficient Organocatalytic Biginelli Reaction Using 2-Ethylhexanoic Acid
Rahim HEKMATSHOAR; Alzahra University - Mojgan KARGAR; Alzahra university - Zahra HASHEMI - Fereshteh GOLI - Abdoljalil MOSTASHARI

Formato:
Enlaces:	A highly efficient synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones in 2-ethylhexanoic acid as green, low cost and recoverable catalytic medium, illustrates good synthetic utility of this method.  Key Words:  2-ethylhexanoic acid, 3,4-dihydropyrimidin-2(1H)-ones/thiones, organocatalyst.
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

Coincidence Points of Hybrid Functions on Cone Metric Spaces
KPR RAO; Acharya Nagarjuna University-Dr.M.R.Appa Row Campus,NUZVID-521 201,Andhra Pradesh, INDIA - K. Siva PARVATHI - Md. Mustaq ALI

Formato:	Peer-reviewed Article
Enlaces:	In this paper, we obtain a common coincidence point theorem for  two pairs of hybrid functions on cone metric spaces. Key words: Cone metric spaces,coincidence points, multi functions.2000 Mathematics Subject Classification : 47H10,54H25.
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

Zinc and Lead Content and Availability in Brazilian Soil Contaminated with Residue of a Secondary Smelting Lead Recycling Plant
Gustavo Rocha CASTRO; Universidade Estadual Paulista, UNESP Instituto de Biociências de Botucatu,SP Departamento de Química e Bioquímica - André R. SANTANA - Guilherme FERREIRA - Barbara M. HEIRAS - Felipe A. SANTOS - Laercio CAETANO - Pedro M. PADILHA - Marco Antonio U. MARTINES - Luciana C. OLIVEIRA - Renato C.F. NEVES - Gustavo R. CASTRO

Formato:
Enlaces:	The sequential extraction procedure of Zinc and lead performed in a Brazilian soil showed that it presents high pollution potential once over 90% of total lead is present in fractions where the metals can be easily mobilized. The fraction contents…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

A PVC Membrane Electrode for Zirconium Based on 4-Nitrophenylazo-n-(2-hydroxypropylamine) Salicylidine
Tayebeh - SHAMSPUR; university - Mahdieh SHEIKHSHOAIE - Mohammad Hossin MASHHADIZADEH - Samira SAEEDNIA

Formato:
Enlaces:	A potentiometric zirconium sensor based on the use of 4-nitrophenylazo-N-(2-hydroxypropylamine)salicylidine (NHPS) as an ion carrier in poly (vinyl chloride) (PVC) matrix, was developed. The best performance was observed for the membrane composition including 26.27% PVC, 65.67% N-POE, 5.43% NaTPB and…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

A Fourier Transform Infrared Spectrophotometry Method Used For Oseltamivir Determination in Pharmaceutical Formulations
Y ABOUL-ENEIN - Andrei A. BUNACIU - Sultana NITA - Serban FLESCHIN - Zeynep AYDOGMUS

Formato:
Enlaces:	A Fourier transform infrared (FT-IR) spectrometric method was developed for the rapid, direct measurement of oseltamivir phosphate (OP) in pharmaceutical formulations. Conventional KBr-spectra were compared for best determination of the active substance in pharmaceutical preparations. The Beer-Lambert law and two…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

Preconcentration of Zn(II) Using β-CyclodextrinButanediolDiglycidyl Ether Polymer Modified With 1-(2-Pyridylazo)-2-Naphthol) (PAN)
Sandeep JAGGI - Usha GUPTA - Poonam Preet KAUR

Formato:
Enlaces:	In this study, a solid phase extraction method has been developed for the preconcentration of Zn(II) at trace level using β-cyclodextrin polymer modified with 1-(2-Pyridylazo)-2-Naphthol (PAN) reagent. After preconcentration, metal retained on the polymer was eluted with 5.0 mL of…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

Complete Lifts of Structures on Manifold to Vector Subbundle
Mustafa OZKAN; Department of Mathematics, Faculty of Sciences, Gazi University

Formato:	Peer-reviewed Article
Enlaces:	In this study, we studied the complete lift of almost product, almost complex, almost contact and almost paracontact structures on a given manifold  to vector subbundle  of vector bundle . Moreover, we studied a correspondence between the integrability conditions of…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

How to Test the Parametric Fit of the Complementary Log Log Model to the Data?
Ozge AKKUS; Muğla University

Formato:	Peer-reviewed Article
Enlaces:	In this study, commands written on the basis of Uniform Confidence Bands (UCB) in the new windows version of the XploRe package for testing the validity of the link function assumed for binary parametric complementary log log model were introduced.…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

10.

Performance Comparison of PWM Methods for 27-Level Hybrid Multilevel Inverters
Mehmet Emin MERAL; Asist. Prof. - Lütfü SARIBULUT; Research Asistant - Ahmet TEKE - Mehmet TUMAY

Formato:	Peer-reviewed Article
Enlaces:	Multilevel inverters have become more popular due to reduced switching losses, low costs, low harmonic distortion and high-voltage capability when compared to traditional PWM inverters. A new family of multilevel inverters that has decreased the number of separated DC sources…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

11.

Seismic Performance Evaluation of Various Passive Damping Systems in High and Medium-Rise Buildings with Hybrid Structural System
Ehsan NOROOZINEJAD FARSANGI; Researcher, Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES) - Azlan ADNAN; Full professor, Group Leader of Engineering Seismology and Earthquake Engineering Research Group (e-SEER), Universiti Teknologi Malaysia, (UTM)

Formato:	Peer-reviewed Article
Enlaces:	The main aim of this manuscript is to bridge existing knowledge gaps by undertaking comprehensive investigation of several high and medium-rise structures in Iran with different damping devices embedded within cut outs of shear walls. To further extend understanding of…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

12.

Seismic Response of Mass Irregular Steel Moment Resisting Frames (SMRF) According to Performance Levels from IDA Approach
Mohammad Hossein CHERAGHI AFARANI - Ahmad NICKNAM

Formato:	Peer-reviewed Article
Enlaces:	Mass irregular structures have stories with effective mass more than 150% of effective mass of adjacent storey. Seismic response of mass irregular structures are assessed by consideration of SMRF structures with 4, 6 and 8 stories, which  mass irregularity is…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

13.

Environmental Master Plans for Preserving Natural and Cultural Environment: The Zonguldak, Bartın and Karabük Planning Region
Arda YALCUK; Abant Izzet Baysal University Faculty of Architecture and Engineering Environmental Engineering Depth Gölkoy Campus-BOLU - Mehmet TUNCER; Abant Izzet Baysal University Faculty of Architecture and Engineering Architecture Depth Gölkoy Campus-BOLU

Formato:	Peer-reviewed Article
Enlaces:	This study discusses the scenario, strategies and policies to be developed for the preservation of the natural and the cultural/historical environments which are of significance in the 1/100000 scale Environmental Master Plans prepared by the Ministry of Environment and Forestry…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

14.

Comparison of Serum RSH, Immunoglobulin Levels and MPO Activity in Patients with Cystic Echinococcosis in Turkey
Kadriye YILMAZOGLU ATLIHAN - Emine Gülceri GÜLEC PEKER - Sule COSKUN CEVHER - Metin AKTAS

Formato:	Peer-reviewed Article
Enlaces:	The aim of this study was to elucidate the effect of larval form of Echinococcus granulosus on human serum antioxidant status and MPO activity and also serum immunoglobulin levels. For this research, sera of 361 patients were received who applied…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

15.

The Review on Spectrophotometric Determination of Synthetic Food Dyes and Lakes
Aman Deep KAUR; Research scholar - Usha GUPTA; Senior Lecturer

Formato:
Enlaces:	Industrialization of the food systems, including a rise in food processing, has increased the use of food additives such as food dyes, preservatives and sweeteners. Scientists have long been concerned that synthetic food dyes and other additives may contribute to…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

16.

Validation of Rapid Gas Chromatographic Method for Determination of Seven Volatile Compounds in a Urinary Tract Antiseptic Soft Gelatin Capsules
Y ABOUL-ENEIN - Ekramy M. Seif ELDEEN - Mohamed A. ETMAN

Formato:
Enlaces:	A simple, rapid and precise gas chromatographic method has been developed for simultaneous determination of seven volatile compounds namely alpha pinene, camphene, beta pinene, cineole, fenchone, borneol and anethol in urinary tract antiseptic soft gelatine capsule. The seven compounds were…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

17.

Antimicrobial and Antioxidant Activities of Pseudevernia furfuracea (L.) Zopf var. furfuracea and Evernia prunastri Lichens Collected from Black Sea Region
Bahar BILGIN SOKMEN - Kadir KINALIOGLU - Sinem AYDIN

Formato:	Peer-reviewed Article
Enlaces:	The antimicrobial and antioxidant activities of the acetone extracts of lichen Pseudevernia furfuracea var. furfuracea (PF) and Evernia prunastri (EP) were investigated. Different antioxidant tests were applied such as ABTS (2,2'-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) radical scavenging activity and reducing power. Antimicrobial…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

18.

Effects of Resveratrol and Potassium Bromate on Cholesterol, Vitamin E and A Level in Lung, Liver and Kidney of Wistar Rats
Serhat KESER; Firat University Faculty of Science Chemistry Department - Okkes YILMAZ; Firat University Faculty of Science Biology Department - Mehmet TUZCU; Firat University Faculty of Science Biology Department

Formato:	Peer-reviewed Article
Enlaces:	In the present study, Wistar rats were randomly divided into three groups: 1. Control (C), 2. KBrO3 (K), 3. Resveratrol+KBrO3 (R). In tissues, cholesterol and vitamins analyses were performed by HPLC. According to our results, while the level of cholesterol…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

19.

Electrochemical Investigation of the Inhibitive Effect of a New Synthetic Schiff-base on the Corrosion of Mild Steel in Acidic Media
athareh DADGARINEZHAD; Material Science and Engineering Department, Shahid-Bahonar University of Kerman, Kerman, Iran - Fatemeh BAGHAEI

Formato:
Enlaces:	In this work the inhibition effect of a new synthetic Schiff base on mild steel corrosion in 1M HCl and 0.5 M H2SO4 was investigated using various electrochemical techniques (potentiodynamic polarization , AC impedance) and weight loss measurements. These measurements…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

20.

Reduced Transport Numbers of PolysulfoneMembranes From The Initial Time EMF Measurements
Aysel CIMEN; Karamanoglu Mehmetbey University Department of Chemistry, 70200 , Karaman, Turkey - Mustafa ERSOZ - Salih YILDIZ

Formato:
Enlaces:	Initial membrane potentials of polysulfone cation exchange membranes were measured with KCl, NaCl, LiCl CaCl2 and FeCl3 solutions by using Ag/AgCl electrodes. The measurements were carried out for KCl / unsupported polysulfone cation exchange membranes (SA3S) or polyester supported polysulfone…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

21.

The Power of Four Tests in Two Way Models with Interaction and No Replication
Hülya OLMUS - Semra ERBAS

Formato:	Peer-reviewed Article
Enlaces:	This article presents tests for the interaction in a two way table with one observation per cell. The conventional linear model theory cannot be used to check for the interaction when there is exactly one observation per cell (no replication)…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

22.

Multi Transformer Cell Inverter with Reduced DC sources
Mohamad Reza BANAEI; Azarbaijan University of Tarbiat Moallem, Tabriz, Iran - H. KHOUNJAHAN - E. SALARY - A. DEHGHANZADEH

Formato:	Peer-reviewed Article
Enlaces:	This paper proposes a new isolated multi transformer cell inverter employing low-frequency single-phase transformers and two DC voltage sources. This inverter includes several transformer cells. Some of cells contain two unidirectional switches that generate two voltage levels and only one…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

23.

Evaluation of Geometric Effect on the Pseudo-Static Seismic Coefficient in Embankment Dams
Mahdi SHIRDEL - Ali GHANBARI - Mohammad DAVOUDI

Formato:	Peer-reviewed Article
Enlaces:	Selection of appropriate seismic coefficients considering the geometry, stiffness and damping of materials is the foremost part of analysis in Pseudo-static approach. So Masjed Soleiman dam for a case study has been selected. Finite Element model of Masjed Soleiman dam…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

24.

Assessing the Relationship between the Compressive Strength of Concrete Cores and Molded Specimens
Ali ERGUN - Gokhan KURKLU

Formato:	Peer-reviewed Article
Enlaces:	There is no universal relation between the compressive strength of cores drilled from concrete elements and molded cylinder and cube concrete specimens. The strength of concrete cores depends on several parameters. The strength correction factors account for these parameters. In…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

25.

Characterization of Mechanical Properties of Porcelain Tile Using Ultrasonics
Semra KURAMA; Anadolu University - Elif EREN

Formato:	Peer-reviewed Article
Enlaces:	Ultrasound affords a very useful and versatile non-destructive method, using a large application area, for evaluating the microstructure and mechanical properties of materials. In this study, porcelain tiles were sintered at different temperatures to change their porosity. Following this, the…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

26.

Compressive Strength of Scoria Added Portland Cement Concretes
Ali OZVAN; Yuzuncu Yil University Geology Engineering Department - Mücip TAPAN; Yuzuncu Yil University Civil Engineering Department - Onur ERIK - Tuba EFE - Tolga DEPCI; Yuzuncu Yil University Mining Engineering Department

Formato:	Peer-reviewed Article
Enlaces:	This paper presents the results of preliminary studies investigating the potential effects of using scoria as supplementary and its amount on compressive strength of concrete. Concrete mixtures containing 5, 10, 20, 30, 40 and 50 % scoria type natural pozzolan…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

27.

Investigation of Thermal Decomposition Behavior of Cerium (III) Acetate Hydrate
Aliye ARABACI; Istanbul University, Engineering Faculty, Department of Metallurgical and Materials Eng., 34320, Avcilar, Istanbul, Turkey - Nuri SOLAK; Istanbul Technical University, Department of Metallurgical and Materials Engineering, 34469, Istanbul, Turkey

Formato:	Peer-reviewed Article
Enlaces:	The thermal decomposition behavior of Cerium (III) Acetate Hydrate, Ce(CH3CO2)31.5H2O , was investigated by using in-situ  High Temperature FTIR Spectroscopy (in N2), High Temperature X-ray diffraction (HT-XRD) (in air) and TG/DTA - MS techniques ( Ar and dry air). Thermal decomposition of…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

28.

Biosorption of Copper (II) from Aqueous Solution by Saccharomyces cerevisiae : Kinetics and Thermodynamics
Muzaffer BALBASI - Ayse TOSUN - Oznur AKCELIK - Mubeccel ERGUN

Formato:	Peer-reviewed Article
Enlaces:	Biosorption equilibrium, kinetics, and thermodynamics of Cu ions onto S. cerevisiae  were studied in a batch system with respect to temperature and initial ion concentration. Biosorption efficiency  increased up to Cu ion initial concentration of 75 mg/L, and then decreased…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

29.

The Verification of the Payback Time for a Solar Driven Absorption Cooling System Depending on Technological Development and Design Data
Mustafa Zeki YILMAZOGLU - Ehsan AMIRABEDIN

Formato:	Peer-reviewed Article
Enlaces:	In this study a solar driven absorption cooling system is offered for a hotel. Solar energy is only used in absorption chiller. The payback time of the offered system with different scenarios are investigated. Solar collectors and absorption chiller price…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science

Recurso libre

30.

Investigation of the effects of different chip breaker forms on the cutting forces using artificial neural networks
hüseyin GURBUZ - Abdullah KURT - Ulvi SEKER

Formato:	Peer-reviewed Article
Enlaces:	This paper presents a new approach based on artificial neural networks (ANNs) to determine the effects of different chip breaker forms on cutting forces such as principal cutting force, feed force and passive force, in the machining of AISI 1050.…
Fecha:	2012-07-19
Recurso:	Gazi University Journal of Science