| Title | A PREDICTION OF THE THERMAL CONDUCTIVITY OF SAPELLI |
| Authors | Joseph Albert Mukam Fotsing, Mbatene Takam |
| Category | Civil Engineering |
| Abstract | The measurement of the thermal conductivity of Sapelli is carried out. A comparison of the experimental and theoretical results is made from some calculation models available in the literature. Equations predicting the thermal conductivity according to the moisture content are proposed in the longitudinal, radial, and tangential directions. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part7/p3/index.htm |
| email | mukam_fotsing_j_a@fulbrightweb.org |
| Address | University of Yaounde I
Ecole Normale Supérieure
P. O. Box 3482
Yaounde CAMEROON |
| |
| Title | A Study on Complexation Equilibria and Spectrophotometric Determination
of CrIII, MnII and FeIII with Thiourea Monophosphazene Derivative |
| Authors | A.E. Arifien, G.M. Taha, A.A.M. Gad and M.Sh. Zoromba |
| Category | Chemistry |
| Abstract | The absorption spectra and acid-base characteristics of 1-phenyl-2,2-
(dianilino-N-phenylthiourea) monophosphazene, H2MPZ, were studied in
water-ethanol media . The equilibrium constants, molar absorptivities,
stability constants of the complexes of CrIII, MnII and FeIII with the ligand
H2MPZ have been determined spectrophotomerically in 10% ethanol at
250C and I = 0.1M NaNO3. The complexation equilibria in solution were
characterized using the graphical logarithmic analysis of the absorbance-pH
graphs. The micro-determination of the concerned metal ions was evaluated
by spectrophotometry based on the proposed complex formation M(H2MPZ)
and M(HMPZ)2 respectively. The effect of a number of interferent cationic
and anionic ions was also discussed. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/part2/p2/A Study on complexation.pdf |
| email | |
| Address | Chemistry Department, Faculty of Science at Aswan, South Valley University,
Aswan, A.R. Egypt. |
| |
| Title | Applications of the lattice Green’s Functions for One and Two Dimensional Lattices |
| Authors | A. Sakaji ,N. Shawaqfeh, J. Khalifeh, |
| Category | Physics, Astronomy |
| Abstract | An expression for the Green’s Function for one and two-dimensional lattices is evaluated analytically and analytically for a single impurity lattices of zero range potential. Also the S-phase shift, and scattering cross section are expressed in terms of Chebyshev polynomials and elliptic |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part4/p1/LGF12D.pdf |
| email | info@ajss.net |
| Address | Physics Department, Ajman University, UAE |
| |
| Title | Certain Improvements In Marshalling |
| Authors | G Sudha Sadasivam1 and Dr A Chitra2 |
| Category | IT and Computing |
| Abstract | The interaction between components and objects in a distributed environment should be highly efficient and transparent to the application programmer. High efficiency can be achieved by improving the inter-processor communication (IPC) mechanism in micro kernels, while transparency can be achieved through interface definition languages (IDLs). Different encoding mechanisms like Extended Data Representation (XDR), Network Data Representation (NDR) and Common Data Representation (CDR) facilitate inter-component communication transparently and efficiently. Marshalling procedures convert data in local machine representation into common network representations. … |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part5/p1/index.htm |
| email | sudhasadhasivam@yahoo.com |
| Address | Department of CSE
PSG College of Technology
Coimbatore –641 004
Tamil Nadu |
| |
| Title | Designing a Digital system with VHDL |
| Authors | Valentina Stoyanova Kukenska |
| Category | IT and Computing |
| Abstract | : In this paper a digital system designing with VHDL is presented. Here are exposed sequentially all the phases of the very digital system's designing. The main methods are also on show here. The project descriptions’ types are presented. The stress is put on the use of VHDL for synthesis of structural and behavioral models.
For creating the project of the chosen digital system an integrated system WebPack was used, as well as ModelSIm XE II for the model's simulation |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part5/p2/index.htm |
| email | vally@tugab.bg |
| Address | Dep. of Computer Systems and Technologies, TU of Gabrovo, Bulgaria |
| |
| Title | Experimental determination of the diffusion coefficients of wood in isothermal conditions |
| Authors | Joseph Albert Mukam Fotsing, Claude Wanko Tchagang |
| Category | Civil Engineering |
| Abstract | The diffusion coefficients of frake (Terminalia superba) was determined in the radial, tangential, and longitudinal directions at tree different temperatures: 30°C, 35°C an 40°C.
The longitudinal diffusion coefficient is larger than the transverse diffusion coefficient. In addition the radial coefficient is larger than the tangential coefficient. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part7/p2/index.htm |
| email | mukam_fotsing_j_a@fulbrightweb.org |
| Address | University of Yaounde I
Ecole Normale Supérieure
P. O. Box 3482
Yaounde CAMEROON |
| |
| Title | Geometric images of simple and complex chemical objects in the space of chemical structures VM(3). Studying the relationship between the languages of chemistry and geometry |
| Authors | Valentin Tzvetanov Penev
Ludmil Lubomirov Konstantinov |
| Category | Chemistry |
| Abstract | We define and analyze the notions chemical point, free and bonded chemical point and chemical graph, which are geometric images in VS(6) of free simple chemical objects, bonded simple chemical objects and complex chemical objects. It is shown that: (?) these notions are sufficient for geometrical representation of arbitrary set of chemical objects; (b) the role of chemical figures in the space of chemical structures VS(6) is played by chemical points and graphs, while that of transformations in this space is played by translations and rotations in the ordinary physical space VE(3) and in Mendeleev's space VM(3); (c) from a geometrical point of view, the study of various chemical processes is a study of the transformation of the corresponding sets of chemical figures in VS(6); (d) chemistry is a science for chemical figures in VS(6), for their mutual disposition and for the size of their parts as well as for the transformations of chemical figures. Using the developed mathematical formalism and the introduced basic notions an entirely geometric criterion for equivalency of chemical objects (i.e. of chemical figures in VS(6)) is formulated in a general form. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/part2/p6/index.htm |
| email | vpenev@bas.bg |
| Address | Central Laboratory of Mineralogy and Crystallography
Bulgarian Academy of Sciences |
| |
| Title | Geometrization of the language of chemistry:
Mathematical representation of the complex chemical objects |
| Authors | Valentin Tzvetanov Penev
Ludmil Lubomirov Konstantinov |
| Category | Chemistry |
| Abstract | The space and the coordinate system, necessary to construct entirely mathematical representations of the complex chemical objects, are introduced. It is proved that using the method proposed in [1] one can construct entirely mathematical and unique representations of arbitrary complex chemical objects. It is shown that using this method an exactly defined "chemical charge" is in fact ascribed to each point of the ordinary three-dimensional physical space. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/part2/p3/index.htm |
| email | vpenev@bas.bg |
| Address | Central Laboratory of Mineralogy and Crystallography
Bulgarian Academy of Sciences |
| |
| Title | Mathematical representation of chemical processes:
Part II. Representation of the free physical particles and of the laws for preservation of electric charge and preservation of mass in chemical reactions. |
| Authors | Valentin Tzvetanov Penev
Ludmil Lubomirov Konstantinov |
| Category | Chemistry |
| Abstract | The method for an entirely mathematical representation of chemical processes, based on the physical conceptual scheme is analyzed. The notion "free operator" is introduced. It is shown that the type and number of free physical particles in the chemical reactions is represented entirely mathematically through the corresponding three types of operators in Mendeleev's space VM(3). The application of the proposed conceptual and mathematical formalism is demonstrated on the example of an entirely mathematical representing of a particular simple chemical process. The laws of preservation of the electric charge and mass in chemical reactions are formulated in terms of the developed conceptual and mathematical formalism. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/part2/p5/index.htm |
| email | vpenev@bas.bg |
| Address | Central Laboratory of Mineralogy and Crystallography
Bulgarian Academy of Sciences |
| |
| Title | Mathematical representations of chemical processes:
Part I. Conceptual schemes for representing changes; space and coordinate system; method. |
| Authors | Valentin Tzvetanov Penev
Ludmil Lubomirov Konstantinov |
| Category | Chemistry |
| Abstract | Two main conceptual schemes for representing changes, physical and geometrical, are formulated and discussed. The space VP(7) and the coordinate system KP(7) of the chemical processes are introduced. Formulated and analyzed is the method for constructing of entirely mathematical and unique representations of arbitrary chemical processes. Part of the missing mathematical apparatus (mathematical formalism) is defined and constructed. It is shown that the processes of absorption and emission of different kinds of physical particles (i.e. electrons, protons and neutrons) of the simple chemical objects are mathematically represented in VP(7) via the action of the corresponding three kinds of operators on the mathematical images of the simple chemical objects in the Mendeleev's space VM(3). |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/part2/p4/index.htm |
| email | vpenev@bas.bg |
| Address | Central Laboratory of Mineralogy and Crystallography
Bulgarian Academy of Sciences |
| |
| Title | OPTICAL PROPERTIES OF CHEMICAL BATH DEPOSITED FeCdS3 THIN FILMS |
| Authors | F. I. EZEMA |
| Category | Chemistry |
| Abstract | Multi-component thin film of FeCdS3 was deposited on glass slide from aqueous solutions of Fe(NO3)3.9H2O, CdCl2.2½H2O and thiourea in the which ammonium solution and EDTA were employed as complexing agents. The film was studied for its optical properties using spectrophotometers. The optical characterization shows that the band gap of the film is 2.30eV and this is a band gap between the band gap of FeS2 (2.16 -2.18 eV) and CdS (2.37-2.40 eV). This obtained band gap was found to be very close to that of CdS which shows that the film is rich in cadmium. The average transmittance of film is greater than 50% in the VIS-NIR regions and high reflectance of greater than 12% in the same regions, and exhibits poor transmittance in the UV regions. Hence, they could be effective as coatings for poultry houses and as well a good material for solar cell fabrication |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/part2/p1/index.htm |
| email | fiezema@yahoo.com |
| Address | DEPT OF PHYSICS & ASTRONOMY / SCHOOL OF GENERAL STUDIES, NATURAL SCIENCE UNIT, UNIVERSITY OF NIGERIA, NSUKKA. |
| |
| Title | PREPARATION AND OPTICAL PROPERTIES CADIMUM CHLORIDE THIN FILMS PREPARED BY SOLUTION GROWTH TECHNIQUE |
| Authors | F. I. EZEMA |
| Category | Chemistry |
| Abstract | Cadmium chloride (CdCl2) thin films were prepared by solution growth technique from chemical baths containing solutions of cadmium acetate, ammonia and potassium chloride with NH3 as complexing agent. The effects of varying dip times on the optical properties of the film and the influence on the growth rate were studied. Our reasonably inexpensive and simple solution growth technique has been found suitable in obtaining halide thin films with reasonably satisfactory properties. The film properties studies are chemical composition and absorbance/transmittance. Other properties deduced from absorbance/transmittance include refractive index (n), which has been obtained in the average range between 2.15 and 2.70, extinction coefficient (k) ranges between 1.40 x 10-2 and 5.50 x 10-2 and optical conductivity (s) ranges between 2.13 x 1013S-1 and 8.07 x 1013 S-1. Thickness in the range between 0.150 and 0.611mm has been deposited. Some of the films were found to have very high absorbance in UV- VIS- NIR regions while the films absorbance increases as thickness increases hence they could find applications in solar radiation absorbers for solar cell fabrications. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/part2/p7/index.htm |
| email | fiezema@yahoo.com |
| Address | DEPARTMENT OF PHYSICS AND ASTRONOMY,
UNIVERSITY OF NIGERIA, NSUKKA, ENUGU, NIGERIA. |
| |
| Title | Raising the coeficientof technological use of the measure instruments by increase of thear controlling interval in metrological laboratory |
| Authors | Tania Pehlivanova |
| Category | Electronics, Electrotechnics |
| Abstract | In the article a methods for reorganization of the technical regulations for controlling intervals of the working measure instruments and diagnostics of aviation and radioelectronic appliances is proposed. The substance of the methods is comprised in raising of the controlling intervals for verification in the control-measuring labs, validity on the use of the apriori information for the technical condition of measure instruments, received in leading of the control verification in the exploit organizations during the time of the controlling limit. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part1/p1/index.htm |
| email | |
| Address | TRAKIA UNIVERSITY STARA ZAGORA
BULGARIA
http://www.uni-sz.bg/ |
| |
| Title | RISK MANAGEMENT IN A BULGARIAN COMPANY |
| Authors | Snezhanka Ovcharova |
| Category | Economics |
| Abstract | The present paper examines the application of risk management in the conditions of a Bulgarian company. Analysis of risk in company’s activities is carried out as well as a risk management program is elaborated, which is an intrinsic part of the strategic company management and ensures its sustainable functioning and development within market economy. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part6/p1/index.htm |
| email | sn_ovcharova@yahoo.com |
| Address | Varna Free University
Bulgaria |
| |
| Title | Some properties of mappings in the model VH |
| Authors | Gokhan Çuvalcioglu |
| Category | Mathematics |
| Abstract | In this paper we study the basic decomposition theorem for mappings in VH that is the model of intuitionistic set theory which is an extension of fuzzy set theory |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part3/p1/index.htm |
| email | gcuvalcioglu@mersin.edu.tr |
| Address | University of Mersin,
Faculity of Arts and Science
Department of Mathematics |
| |
| Title | THE EFFECT OF DENSITY AND WATER CONTENT UPON THE DYNAMIC PROPERTIES OF RECONSTITUTED MORAINE SAMPLES IN THE SMALL STRAIN RANGE |
| Authors | Stanislav Lenart |
| Category | Civil Engineering |
| Abstract | The deformation characteristics of reconstituted moraine samples were investigated in a resonant column test at IST, Lisbon. Material from a landslide that had occurred in a seismically very active area in Slovenia was used in the test.
It was assumed that the behaviour of material with a grain size of 4 mm or less could indicate the general behaviour of the landslide. Particular attention was paid to the behaviour of this material at very small strains, and to the effect of different water contents and densities of the material. Showing the influence of the water content and confining stress an empirical equation defining the small strain modulus in terms of the void ratio and confining stress has been proposed for different water contents |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part7/p1/index.htm |
| email | stanislav.lenart@zag.si |
| Address | Slovenian National Building and Civil Engineering Institute (ZAG)
Dimiceva 12, SI-1000 Ljubljana, Slovenia |
| |
| Title | Validity a checking in technological modules |
| Authors | Vencislav Ananiev, |
| Category | Electronics, Electrotechnics |
| Abstract | The technological modules TM with high degree of automation ATM have particular place in modern production. Work under difficult ways and conditions- unceasing production and temples of requirement. The Amortization and refusals more intensive than usual machines and productions. |
| Issue | 11 |
| Date_posted | 2/14/2004 |
| URL (full text) | http://www.acadjournal.com/2004/v11/Part1/p2/index.htm |
| email | ananievi@abv.bg |
| Address | Burgas "prof. d-r. As. Zlatarov" University, Burgas, Bulgaria |
| |
