bluuebunny/crossref_metadata_2025 huggingface dataset:
System identification approach application for evaluation of system properties degradation
Authors: Trajkovic Marina , Bruhns Otto , Meyers Albert , Igic Tomislav , Mijalkovic Marina
Published: August 2008

In respect to the subspace identification method as one of the possible variants of inverse dynamic analyses, behavior of real structural systems with real load and real noise contaminated input/output data was investigated in this work. A useful and non-destructive dynamic parameters evaluation tool - vibration monitoring of the structure - is proposed. The report of original investigation on real models excited by an impulse load in laboratory is also presented. A special contribution is a software program for experiment monitoring and for determination of relevant mechanical characteristics as well as of the location of a possible structural damage.
Dependence of the basic dynamic parameters on the disturbing force of the impact impulse type with different forms
Authors: Prolovic Verka , Bonic Zoran , Zivkovic Srdjan
Published: August 2008

In the modern civil engineering design, especially in the field of machine foundations, the dynamic actions in the form of the impulse load that is short-term, high intensity loads are very frequent. When an acting force during a short time interval remains constant, the impulse is of a rectangular form, as opposed to the trapezoid, triangular, parabolic and sinusoid form, with defined time of increase and decrease of the load. This paper considers the influence of the form of the impact impulse load on the dynamic response of the foundation structure, without changing the remaining parameters.
The influence of micro location on the air freezing index
Authors: Mazic Branko
Published: August 2008

In this paper are exposed research results of air freezing index values occurring in area of Bosnia and Herzegovina. Theoretic probabilities of air freezing index occurrence are calculated, based on data of 26 meteorological stations, in order to determine its return periods of appearing (the probability of air freezing index appearance average once in period considered). To this purpose five the most frequent in praxis theoretic distribution functions are used: GAUSS, GALTON, LOG-PEARSON, PEARSON and GUMBEL. As the most appropriate function for all meteorogic stations the LOG-PEARSON was selected because it on the best way approximates values of calculated air freezing index. Regarding to influence of micro location on the value of air freezing index some independent parameters of location which are measurable (variables) and have supposed influence, are took in analysis. To this purpose the mathematic model of multi variant regression analysis was used and the regression equation of the associated influence of independent parameters was determined. Using this discovered equation designers of road pavement can for each micro-location cutted by the road line, calculate the air freezing index and check the pavement structure on the harmful freezing effects.
Research of the structural, formal and aesthetic characteristics of the façade thermal insulation systems
Authors: Vasov Miomir , Bogdanovic Ivana
Published: August 2008

The elements of the structure of the fa?ade thermal insulation systems are exposed to various external actions and it is necessary to design and construct them in a manner which would make them resistant to the detrimental influence of the forces acting upon them. The fa?ade thermal insulation system, depending on the structure, may have various impact on the aesthetic and formal possibilities of a structure, in this way influencing the comprehensive impression of a space and its ambient value. This paper was done in the framework of the scientific-research project "Development of the fa?ade thermal insulation system" at the Faculty of Civil Engineering and Architecture of Nis, which is financed by the Ministry of Science, Technology and Environment Protection of the Government of Republic of Serbia.
Open and recreational spaces as the parameters of the dwelling quality
Authors: Mitkovic Petar , Bogdanovic Ivana
Published: August 2008

Open and recreational spaces represent the essential content of a residential zone, whose arrangement, equipping and maintaining affects the dwelling quality. The adequate arrangement and maintenance of the open and recreational spaces, environmental comfort and accessibility contribute to the transformation of the aesthetic identity of the functional-spatial unity of the housing ambient they belong to. This paper explores the content and the functional structure of the open and recreational spaces, categories of the said spaces in a housing zone and the basic principles of arrangement on whose basis an analysis and evaluation of the open and recreational space in the city of Nis territory was done. The conducted analysis has an aim of issuing recommendations and guidelines for the improvement and revitalization of the free and recreational spaces, which determine the dwelling quality.
Proposition of a model for the limit state of rupture of timber structures
Authors: Stojic Dragoslav
Published: August 2008

This paper deals with a general state of European norms for timber structures, according to "Eurocode 5: Design of timber structures, part 1.1 General rules and rules for buildings ", together with the following European norms EN. The concept of design of timber structures, according to limit states and Eurocode 5 (EC5). draft is briefly shown. In some areas a comparative analysis of EC5/JUS/DIN norm is given. The paper contains the proposition of the possible model for limit state of rupture of the timber structures during bending and eccentric stress.
The village of Kunovica in the sustainable development context
Authors: Turnsek Branko
Published: August 2008

Kunovica, is a typical mountain village, with large house density, and is situated on the slopes around the Kunovica river, surrounded by silence and tranquality of intact nature. It is the village of contrasts: on one hand there is the beautiful nature, great natural conditions for raising cattle and on the other hand it is a village with only a small number of mostly elderly people (101 inhabitants), few infrastructural systems and buildings it is far from the main roads (although it used to be near them) which very weak in economical terms. The most important problem faced by this village as well as by the other villages in this area, is the depopulation i.e. the migrations. This paper analyses the present situation of the sustenance elements on the level of the village, and of the relevant representative sample of the households employing the previously defined parameters. By definition, natural, economic, human and spatial resources analyzed in this way can describe present situation, its causes and consequences, but they also can define the level of sustenance, the capacities and the ways of its possible development. The obtained results and conclusions made were used as the basis for recognizing the further development and transformation of a village household, and particularly the transformation of the farmyard as the spatial household frame and place where all these processes are taking place.
Selection of the appropriate methodology for the deterministic seismic hazard assessment on the territory of the Republic of Serbia
Authors: Bulajic Borko , Manic Miodrag
Published: August 2008

This paper presents a discussion regarding the most common approaches to the deterministic seismic hazard analysis, as well as their relation with the probabilistic hazard analysis. Different methodologies for estimation of the strong earthquake ground motion at a site of interest on the territory of the Republic of Serbia are also discussed. When generation of the synthetic ground motion time histories on the territory of the Republic of Serbia is concerned, a method developed by Trifunac and his associates is suggested having in mind that this approach uses only those input parameters that can be easily and accurately defined while at the same time being able to model all properties of strong earthquake ground motion that are presently known as well as to consider the probabilistic nature of earthquake occurrence.
Civil engineering projects realization management
Authors: Mirkovic Slobodan
Published: August 2008

The paper treats the management of the realization of civil engineering projects or civil engineering buildings construction management, as a complex dynamic process, which entails a large number of strategic and operative decisions which are important for an efficient, cost effective, and economic construction. The management process execution is not possible without the functions such as planning, organizing, coordination and control. Planning as the initial function, important for the forecast of the future events tasks and goals, is rendered much simpler by the application of computers and software packages. Such software packages facilitate the integral management planning, realization, as well as control of the course of realization of civil engineering projects, that is the entire course of civil engineering buildings construction. The most frequent programs in this application are the Scheduler, Prima Vera and Project. The experience acquired in the application of these software packages has shown that the best results in civil engineering have been attained by the software package PROJECT 2003.
Selection of the appropriate methodology for the probabilistic seismic hazard analysis on the territory of the Republic of Serbia
Authors: Bulajic Borko , Manic Miodrag
Published: August 2008

This paper presents a review of the approaches to the probabilistic seismic hazard analysis as well as discussion regarding the selection of the appropriate methodology of probabilistic seismic hazard analysis for the territory of the Republic of Serbia. Use of the deductive approach has been suggested, as well as that the new Serbian seismic hazard maps should be expressed through the values of the peak ground acceleration, having in mind that the new hazard maps for the Republic of Serbia should be compiled in compliance with the recommendations of the Eurocode 8.
Function and organization of children playgrounds in the housing estates
Authors: Stoiljkovic Branislava
Published: August 2008

Playing is extremely important for the physical and mental health of children. As the outdoors playing is especially important, playgrounds, as the most favorable form of open spaces for children's playing, are of immense significance and they are necessary in the housing districts. Children need the playgrounds which challenge their faculties and capabilities and offer the possibility to develop the new ones. Planning and designing of children playgrounds should be performed by the teams of experts, which will honor in the process the numerous standards, recommendations and requirements which determine the location, quality and appearance of the equipment, arrangement of the equipment, kind of material used for the protective surfacing etc.
Design of connections in composite timber-concrete structures
Authors: Stojic Dragoslav , Cvetkovic Radovan
Published: August 2008

This work deals with composite timber concrete structures. By combining timber and concrete in new type of composite material and using the best properties both materials, the high tensile strength of a timber and the high compressive strength of a concrete, depending of different building conditions we can find a lot o reasons for decision to apply this type of the structure in comparison to concrete or steel structure. Here, design methods and procedures for determination of load bearing capacity bar shaped connectors (fasteners) very often used as element connecting timber and concrete in composite structures will be given. The procedure will be exposed and explained according to the new fashioned methods collected as set of Euro-norms in Eurocode 5. The design equations in Eurocode 5 derived from Johansen's work are based on a rigid plastic behavior of the fastener under bending moments and the timber under embedding stresses and take into account the plastic moment capacity of the fastener.
High quality concrete beams bending under the long and short term loads
Authors: Radojicic Vladimir
Published: August 2008

The paper deals with the analysis of different compounds for the production of high-quality concrete and an experimental research of the selected high quality concrete beams. The beams have been bent by both the short term and long term transverse loads. By a detailed analysis of experimentally determined stress-strain quantities and by their comparison with the results of computation according to BAB-87, a good agreement of the results could be established.
Most significant buildings of the moderne style multi-family housing in Nis 1920-1941
Authors: Kekovic Aleksandar , Cemerikic Zoran
Published: August 2008

The paper presents the buildings of multi-family housing which were designed and constructed in the spirit of the Moderne movement, in the period between two world wars, that is 1920 - 1941 in Nis. The Moderne movement which was dominant architectonic movement in Europe after the world war I, quickly gained followers in Serbia, and thus in Nis, both the architects and investors, because of its functionality and building cost-efficiency. The representative housing buildings in Nis, which were designed in the spirit of the Moderne, exhibit some aspects of development of these structures, that is, influences of the preceding styles and an inherited building model on the formation of Serbian, that is, Nis Moderne and its significance for the development of the city of Nis in the later period. .
Possibilities of applications of the rural development programs
Authors: Vasilevska Ljiljana
Published: August 2008

The problem researched in this paper refers to the possibilities of applications of the rural development programs in the framework of the regional development programs and regional policy. Namely, the rural areas are one of resources of a given region, its potential or limitation, and therefore actively participate in the process of endogen development of the region, and the reactivation of its developmental potential. The village restoration program is thus considered a plan element, of the integrated approach to the spatial planning, defined at a national and operationalized at a regional and a local level as a means of more regular and endogenously based regional and rural development. .
On Lynch's and post-Lynchians theories
Authors: Sidjanin Predrag
Published: August 2008

The researches in the field of spatial cognition have grown steadily since the sixties (XX century). Architects, urban planners, geographers, anthropologists and psychologists have attempted, from their different points of view, to characterize those attributes of spatial environments that constitute for them a great source of experience. These are highly multidisciplinary experiences dealing with the interaction between humans and their environment at many levels. The task of this paper is to give an overview of Kevin Lynch's theory of 'urban form', as set out in the book 'Image of the City' (1960). This book is crucial among all the literature about the look of cities. Lynch introduced the importance of human vision and our analysis has the task of elucidating this importance today. It is an important study, following on from which several new theories have been developed. More important, is the theory of cognitive perception of the urban environment and more specifically - cognitive mapping; in the domain between space representation and cognitive psychology. This paper explains concepts concerning cognitive maps, and provides some comments on them as an review of post-Lynchians theories and some related computer-based applications.
Psycho-developing needs of children and spatial features for children's stay
Authors: Stankovic Danica
Published: August 2008

The purpose of this study is to look for possibilities of more quality constructing, i.e. a better organization and materialization of pre-school premises, and also to deal with the problem which comes up considering children's developing needs, based on the psychological aspect and features such space has to have as children's residence. Here in the study has been done a systematization of the possible features of the space in pre-school premises where children can spend time considering the level of positive influence that space can have on their abilities development, as well as their cognition process and socialization.
Plastification process of steel frames through discretization of plastic zone
Authors: Mesic Esad
Published: August 2008

In the paper there is propose of numerical model for nonlinear analysis of steel frames with use of localized nonlinearity. Main concept of model consists of discreet ordering of series nonlinear finite elements - springs "zero length" in the areas of expected frames plastifikations. The frame elements between the sections with nonlinear elements behaved linear. On that way the forces in the elements of frames for the most degrees of freedom are linear in the relation of displacement, but nonlinear behaviour occurs in relatively small number degrees of freedom. This kind of model can be explicitly introduced in consideration of geometrical imperfection, backward stresses and etc. .
System for central monitoring, control, data acquisition, and automatic regulation for ARWQM
Authors: Markovic Natasa , Dzunic Jovana , Djordjevic Djordje , Gruber Günther
Published: August 2008

This paper deals with construction of device for water quality monitoring on open water flows and connection of devices on individual river basins into central system for monitoring and supervision through GPRS modem. The device was tested on the WWTP (Waste Water Treatment Plant) in coal mine Citluk, Sokobanja, and laboratory of the Faculty of Civil Engineering and Architecture Nis.
Effect of wind speed on accuracy of Turc method in a humid climate
Authors: Trajkovic Slavisa , Stojnic Vladimir
Published: August 2008

The Turc method is one of the simplest and most accurate empirical equations used for ETO estimation. The objectives of this study are: first, to investigate the effect of wind speed on accuracy of Turc method; second, to develop the wind speed adjustment factors for the Turc method. The adjusted Turc method provides the quite good agreement with the evapotranspiration obtained by the FAO-56 Penman-Monteith method. It gave reliable estimation at all the locations and it has proven to be the most adjustable to the local climatic conditions. These results recommend the adjusted Turc method for estimating reference evapotranspiration.
Gornja Studena village in the context of sustainable development
Authors: Turnsek Branko
Published: August 2008

The paper analyzes the present condition of the sustainability elements at the level of a village, and then on the relevant representative sample of the households, according to the parameters defined in advance. By definition, such analysis of natural, economic, human and spatial resources provides the picture of the present status, but also defines the sustainability degree, and the capacities and potential directions of development. The obtained results and drawn conclusions served as a platform for the analysis of the future development and transformation of the village, the households, that is, the courtyards as they are spatial frame of a household and a central stage where these processes take place. Gornja Studena belongs to the group of spontaneously formed, sparse/dense hill villages. It was formed in the upper part of the Jelasnica valley, on the slopes of Suva planina mountain, under the Mosor peak, along the way leading from Nisa to Bojanine Vode, on the east and west side of Studenica stream, flowing through the middle of the village, parallel to the road. The nature has been, as always, both generous and miserly taking on one side and giving on the other. There are rich complexes of forests and pastures, and favorable conditions for livestock keeping, mild climate, as well as many other natural and environmental values in the village locality, the ski resort and other tourist destinations of Bojanine Vode, which are nearby, did not help the village development. It is situated on the periphery of the region, and it is one of the most distant villages from the city, far away from the main traffic routes (though it has not always been like this) with poor public utilities and infrastructure systems and structures, with an elderly population which is economically weak., of small land resources and unfavorable terrain configuration f or an intensive development of agriculture. It is impoverished in demographic terms and the remaining young population is mostly oriented towards the city. .
Composite timber-concrete road bridge structure
Authors: Stojic Dragoslav , Kajganovic Toma
Published: August 2008

This work presents preliminary design of the road bridge made of laminated timber. The supporting system of the main bearing elements is made of the laminated timber in the system of arch with three joints; the bridge slab is designed as continuous slab, made of nine equal fields; each pair is made as composite timber-concrete beam, where the road slab is made of concrete and the needle pieces are made of timber. Fundament is based on HW piles. All the elements are designed to Eurocode.
Spatial perception ability from two-dimensional media
Authors: Hie Ksenija , Stulic Radovan
Published: August 2008

Deterioration in the spatial visualization ability of students entering University, being much researched in other countries has also been detected in Serbia. The Department of Architecture entrance exam includes a geometric exercise in spatial forms testing the students' capability to rotate, cut and frame objects drawn in axonometric projections and the design of a free form geometric composition. The results vary from poor solutions deprived of three-dimensionality to extremely rich three-dimensional free forms. Based on numerous pieces of research on the topic, and on the results of both entrance and subjects exams we felt that the traditional course of descriptive geometry had to be reformed. We carefully reviewed all the topics of the existing course by closely analyzing the connections with most other subjects. The reforms are based on the characteristic views as well as characteristic elements of the structure of geometric forms, releasing the course from all unnecessary planimetric constructions and details. Therefore, a successful geometric understanding (from two-dimensional drawing to three-dimensional thinking) of the examined spatial form became possible only on the basis of the minimal information. This paper presents the concept of geometric problems' at the entrance exam and reformed course of geometry and perspective at our Faculty.
Application of hydrodynamic models in reducing the indeterminacy of the input parameters for underground streams simulation
Authors: Djuric Dusko
Published: August 2008

The key issue which arises during the preparation of the input data at modeling of all the hydraulic systems is the one of the sufficient and optimal number of input data. Here, the answer to the question has been found by using the existing research in this field, with the application of GROW software package which simulates the two-dimensional streaming of ground water in the aquifer strata. Thus, the subject of this paper is: N Analysis of the required number of measuring points in order to reduce the indeterminacy down to the level where the further increase of the number of measuring points would not result in the higher quality. N Analysis of the input data indeterminacy propagation through the simulation models. The sample used for the analyses is a part of the water resource system in the aquifer of Semberija, Bosnia and Herzegovina, in the surrounding area of the town of Bijeljina. Apart from the separate analysis of aquifer as a source of groundwater, the paper specially addresses the analysis of the dominant influence of individual indeterminacies and potential for their reduction Initially, the existing data were used, and then the additional existing and input data were collected, and afterwards the results were compared. Since each new quality piece of input data contribute to the reduction of the model and system indeterminacy, for the purpose of this study, the additional observations and field research were organized. On the basis of the additional measuring and observation, groundwater flow analysis model was calibrated.
Outbreaks of health-care-associated infections in the province of Vojvodina
Authors: Cosic Gorana , Stefanovic Slavica
Published: August 2008

Introduction. The goal is to investigate epidemiological characteristics of outbreaks of health-care-associated infections in health care institutions such as hospitals, nursing homes and ambulatory care settings. Material and methods. Relevant data associated with outbreaks in health-care settings in the period from 1980 to 2004 were retrospectively collected from epidemiological annual reports of infectious diseases in Vojvodina. Descriptive statistics were applied to the data. Results. The mean number of outbreaks is 7 per year (ranging from 0 to 13 outbreaks) involving 22 cases per outbreak (ranging from 2 to 74 cases). The most frequently involved settings (51%) were nursing homes and most (31%) of the patients were more than 60 years old. This surveillance documented that wards for children less than 12 months of age were the most frequently (57.5%) associated with nosocomial outbreaks in hospitals. The leading diseases were gastrointestinal tract infections with case fatality rale of 1.8%, that is 10-100 fold higher than rales in general population. The leading transmission route in 70% of outbreaks was contact, demonstrating the association between infections and poor general and hand-hygiene policies. Conclusion. The proportion of nosocomial outbreaks in total number of out?breaks is 9%. The most frequent are gastrointestinal outbreaks transmited in long-term-care facilities by contact route, involving elderly patients. Introducing proper environmental and hand hygiene policies in health-care settings with strict imple?mentation of procedures may significantly decrease the number of nosocomial infections and prevent nosocomial outbreaks. .
Distribution of HLA antigens in families of patients with leukaemias
Authors: Vojvodic Svetlana
Published: August 2008

Introduction. Since the discovery of major histocompatihility complex influence on manse leukaemia in 1964, an HLA association with leukaemia in humans has been considered as a possible genetic risk factor that contributes to development of leukaemia. In addition to associations of several IILA antigens with leukaemias, it has been observed that patients with leukaemia have an increase in the frequency of HLA identical siblings, higher degree of HLA compatibility with their parents as well as higher parental HLA sharing rate in comparison to the families without patients suffering from leukaemia. Material and methods. To test hypothesis that susceptibility to leukaemia can be caused bv influence of a recessive genes associated with the major histocompatibilily complex in man, we analyzed the distribution of I class HLA antigens in 77 families of patients suffering from different types of leukaemia. In the affected families and in 72 families of healthy controls, we investigated HLA identical sibling frequency, parental sharing of one, two or three HLA antigens and degree of compatibility of parents and off springs: existence of haploidentity, compatibility in l' and 4/4 HLA antigens of A and B loci. Results We have found that in families with affected persons there is a statistically significant difference in number of HLA identical siblings in comparison to the group of healthy controls (t=2,63). Also the results have shown that among the parents of affected persons there is a statistically significant difference in mutual compatibility in one (t=3,012) and two ft= 2,4) HLA antigens. In addition, we observed an increase in the frequency of higher rate of compatibility between patients and their parents (t=3,88) in l' HLA antigens, to their mothers (t=2,83) and to their fathers (t=2,55), respectively, in comparison to the healthy control group. Conclusion The results of this study show that in families with persons suffering from leukaemia there are possible recessive factors associated with HLA system which could cause distorsion of HLA antigens segregation and as a possible genetical risk factor contribute to development of leukaemia. .
Surgical treatment of temporal lobe epilepsy
Authors: Kelemen Ana , Bozic Ksenija , Halasz Peter
Published: August 2008

Introduction. The surgical treatment of epilepsy is a therapeutic procedure aimed at removal of the brain tissue responsible for seizures. Neurological examinations are performed to delineate the epileptic zone, which is then removed, without causing a functional deficit. In order to fulfill these goals, it is essential to localize accurately and lateralize the epileptogenic zone and the surrounding eloquent cortex. Material and Methods. Ninety-four adult patients were included in the study of the Epilepsy Center, National Institute of Psychiatry and Neurology, Budapest. All patients underwent a standard anterior temporal lobectomy between 1989 and 2001, whereas their preoperative evaluation consisted of detailed history of epilepsy, interictal EEC (awake and asleep), video EEG monitoring of seizures, magnetic resonance imaging, all according to the epilepsy protocol and neuropsychological investigations. The mean follow up was 6.1 years (range: 2-17 years). Seizure outcome was assessed annually, using Engel's classification. Seventy-two percents of patients were seizure-free 1 year after surgery. Results The percentage of seizure-free patients two, five and ten years after the surgery was 67%, 59%, and 61%, respectively. Discussion and Conclusion According to cost analysis, epilepsy surgery is considered to be cost effective. However, in the long run, indirect cost benefits (employment, independent living) add even more to the cost ef?fectiveness of this method. Although the economic aspect is of great importance, especially in countries with limited financial resources, it is often neglected both by neurologists and health authorities. .
Pain indicators in newborns
Authors: Spasojevic Slobodan , Bregun-Doronjski Aleksandra
Published: August 2008

Definition of pain. The International Association for the Study of Pain has defined pain as "an unpleasant sensory and emotional experience associated with actual or potential tissue damage or described in terms of such damage." The interpretation of pain is subjective. Each person forms an internal construct of pain through encountered injury. Pain and newborn. The issue of pain perception in newborns, its management and prevention has been neglected for decades. The inability of "self-report" of painful experience has contributed significantly to misunderstanding of the importance of this problem and in?adequate treatment. The main characteristic of this 'critical window of brain development' period is rapid enlargement of brain volume and its great plasticity. Harmful short-term and long-term consequences can arise as a consequence of disturbance of the sophisticated balance between newborn and its surrounding. Neonatal pain indicators. As a response to a present painful stimulus, the newborn adapts to this acute stress with changes in endocrine, vegetative, immune and behavioral area. An ideal pain indicator in neonatal period does not exist. There are several different groups o them, namely contextual and developmental indicators (gestational age, contributed illness, medication, for example), physiological (heart rate, vagal tone, breathing rate, blood pressure, oxygen saturation, transcutaneous partial pressures of oxygen and carbon-dioxide, intracranial pressure, palm sweating) and behavioral ones (face expression, movements of limbs, cry), several neonatal pain scales were constructed on the basis of these indicators. .
Total colectomy: Options in management of acute obstruction of the left-side colon
Authors: Vukovic Milivoje , Moljevic Nebojsa
Published: August 2008

Introduction. Emergency colorectal surgery has been associated with a high morbidity and mortality rate. The current trend for the management of obstruction of left-sided colorectal carcinoma favours primary resection and anastomosis, as a safe and acceptable approach to selected patients. Method Retrospective review of 81 patients (46 male and 35 female, mean 64 years). Results Morbidity after emergency total colectomy was 21%, and mortality was 6%. There were 6 anastomotic complications (2 an-astomotic disruptions and 4 anastomotic leaks). Mean hospital stay was 13 days. 82% patients had adequate continence. Discussion: Traditional approach for left-sided colon obstruction is three-stage procedure (Bloch-Paul-Mikulicz). The idea of removing dilated colon proximal to an obstructing tumor is not new, since Lane suggested this option in 1914. In 1965 Hughes and Cuthberson described their experience with 12 patients. At the moment of laparotomy 20% patients had advanced malignant disease. The cumulative morbidity and mortality are high in three-stage procedure. Three-stage approach is associated with high permanent colostomy rate. One-stage resection with primary anastomosis of the obstructed left-sided colon is a safe alternative to staged procedures. Emergency radical resection can be safely performed in majority of patients with left-colon obstruction. Conclusions Total colectomy with anastomosis is a suitable procedure for treating left-sided colonic obstruction provided that pelvic floor is adequate. Total colectomy has low mortality, acceptable morbidity and good quality of life. The success of the surgery depends on the selection of patients. .
The surgical treatment of the recurrent dislocation on the shoulder joint with minimum invasion anterior approach
Authors: Ninkovic Srdjan , Stankovic Milan , Savic Dragan , Matijevic Radmila , Milankov Miroslav
Published: August 2008

Shoulder joint is one of the spherical joints and one of the most movable but also the most unstable joint of locomotive apparatus. The aims of this work are to review and analyze the results of medical treatment of frontal recurrent dislocations on the shoulder with open surgery technique on the Clinic for Orthopaedic Surgery and Traumatology in Novi Sad in the period from 2002 to 2005. Twenty one patients with anterior recurrent dislocations of the shoulder were operated on, 19 men and 2 women. The average age of those patients was 24.8 (15-40 year-olds). Ten patients had an injury of the left and 11 patients the injury of the right shoulder. There were eight handball players, four fighting skills players; two of them played volleyball and one was a basketball player. Six of them were not sportsmen. The preoperational and post operational mean value of the modified Rowe scale showed a statistically significant difference (P<0.001). Observing the patients after the operation in the period of 2 years, according to Neer scale, 3 patients (14.28%) had great results (grade over 90), 16 patients (76.19%) had a good result, (75-89), and only two patients (9.52%) had results less than 75. The measuring of the volume of movements after physical treatment in 12 patients (57.14%) has shown the decrease of the outside rotation. Open surgery treatment of the front unstable shoulder joint is reliable and time tested and it gives good clinical results in young sportsmen with undirected unstable, bigger number of dislocations and associated osseous defects. .
Immune response to hepatitis B vaccine in elite athletes
Authors: Rosic Ilija , Malicevic Sead , Medic Snezana
Published: August 2008

Introduction. Hepatitis B viral infection can create serious health problems, such as acute and chronic hepatitis, cirrhosis of liver and hepatocellular carcinoma. Athletes have bigger risk of hepatitis B infection due to frequent injuries with bleeding, their style of living (promiscuity), close contact with teammates, etc. The aim of this study was to investigate the immune response to hepatitis B vaccine among elite athletes, compared to corresponding control group of male subjects from general non-athlete population, and to test out reaction in relation to age. Method. There were 21 elite football players and 30 control non-athlete males. After written consent, they all received three doses of hepatitis B vaccine (Euvax B, Sanofi Pasteur) during 6 months. Eight weeks later, their immune response (as anti-HBs antibody titre in serum) was assessed and statistical significance of the findings was tested. The level of immune response was also evaluated in different age clusters within test groups. Results. None of the footballers was without response to the vaccine. One of the subjects from the control group did not develop it. The group of athletes was with better mean values of antibody titre (1626621 mIU/ml vs. 1568455 mIU/ml), but without statistical significance (t=0.375; p > 0.05), and with a greater deal of subjects who developed very good immune response (titre over 2000 miU/ml). Younger football players had better immune reaction than older (age 18-24, 1795560 miU/ml, vs. age 25-29 years, 1597470 mIU/ml vs. age 30 and more, 1360904 miU/ml), but without statistical importance (II - 1.593; p > 0.05). Conclusion. Our study has shown that elite athletes respond very well to hepatitis B vaccination and have good immune response. Vaccination against hepatitis B of elite athletes is very important, because viral infection can seriously affect their health and stop their careers. .
The influence of glycemia on the left ventricular diastolic function in patients with arterial hypertension
Authors: Milutinovic Suzana , Karadzic Radovan
Published: August 2008

Introduction. Arterial hypertension is a disease which has influence on the left ventricular diastolic function. It has been suggested that impairment of the left ventricular diastolic function in patients with diabetes mellitus is due to arterial hypertension and diffuse peripherial and coronary atherosclerosis which appear early in diabetic patients. Now, however, it is thought, that other mechanisms are responsable for the development of diabetic cardiomyopathy. The aim of the study was to investigate the effect of glycemia on the left ventricular diastolic function in patients with arterial hypertension. Methods. The study included 60 patients with arterial hypertension: 30 (50,00%) patients with diabetes mellitus and 30 (50,00%) with?out diabetes mellitus. The parameters of diastolic function were measured by the pulsed Doppler echocardiographic technique. Isovolumetric relaxation time, deceleration time, maximum velocity of the early stage of ventricular filling, maximum velocity of the late stage of ventricular filling and the early/late stage of ventricular filling ratio were used to assess the diastolic function. Results. The patients with arterial hypertension and diabetes mellitus compared to the patients with arterial hypertension without diabetes mellitus were significantly obese (p 0.001), had significantly higher glycemia (p<0.0001) and left atrial volume (p<0.05). The patients with arterial hypertension and diabetes mellilus compared to the patients with arterial hypertension without diabetes mellitus had significanllly: longer deceleration time (p< 0.05), lower velocity of early stage of ventricular filling (p<0.05) and lower early/late stage oj ventricular filling ratio (p<0.01). Conclusion. Diastolic function parameters of patients with diabetes mellitus are significantly changed: deceleration time is longer, early stage of ventricular filling and early/late ventricular filling ratio are lower.
Determinants of Matrices on Partially Ordered Sets
Authors: Bo Zhou
Published: August 2008

This note extends the results on determinants of greatest common divisor matrices to partially ordered sets.
Some relations and subsets generated by principal consistent subset of semigroup with apartness
Authors: Romano Abraham
Published: August 2008

The investigation is in the Constructive algebra in the sense of E. Bishop, F. Richman, W. Ruitenburg, D. van Dalen and A. S. Troelstra. Algebraic structures with apartness the first were defined and studied by A. Heyting. After that, some authors studied algebraic structures in constructive mathematics as for example: D. van Dalen, E. Bishop, P. T. Johnstone, A. Heyting, R. Mines, J. C. Mulvey, F. Richman, D. A. Romano, W. Ruitenburg and A. Troelstra. This paper is one of articles in their the author tries to investigate semugroups with apartnesses. Relation q on S is a coequality relation on S if it is consistent, symmetric and cotran-sitive; coequality relation is generalization of apatness. The main subject of this consideration are characterizations of some coequality relations on semigroup S with apartness by means od special ideals J(a) = {x E S : a# SxS}, principal consistent subsets C(a) = {x E S : x# SaS} (a E S) of S and by filled product of relations on S. Let S = (S, =, 1) be a semigroup with apartness. As preliminaries we will introduce some special notions, notations and results in set theory, commutative ring theory and semigroup theory in constructive mathematics and we will give proofs of several general theorems in semigroup theory. In the next section we will introduce relation s on S by (x, y) E s iff y E C(x) and we will describe internal filfulments c(s U s?1) and c(s ? s?1) and their classes A(a) = ?An(a) and K(a) = ?Kn(a) respectively. We will give the proof that the set K(a) is maximal strongly extensional consistent ideal of S for every a in S. Before that, we will analyze semigroup S with relation q = c(s U s?1 ) in two special cases: (i) the relation q is a band coequality relation on S : (ii) q is left zero band coequality relation on S. Beside that, we will introduce several compatible equality and coequality relations on S by sets A(a), An(a), K(a) and Kn(a).
The variance of the vertex degrees of randomly generated graphs
Authors: Gutman Ivan , Paule Peter
Published: August 2008

We consider graphs with n vertices and m edges constructed from n isolated vertices by selecting among them, uniformly at random, m pairs and connecting them by m edges. The variance of the vertex degrees of such graphs is shown to be equal to 2m (n - n ? 2m)/(n 3+ n ) . In order to arrive at this formula some combinatorial identities are verified.
Quasi-almost convergence in a normed space
Authors: Hajdukovic Dimitrije
Published: August 2008

A notion of quasi-almost convergence, which is related to Banach limits, is defined and discussed.
Existence and uniqueness of the solution for Lobacevsky’s functional equation
Authors: Neamtu Nicolae
Published: August 2008

The purpose of this paper is to give a theorem for the existence and uniqueness of solution of Lobacevsky's functional equation and to effective find it.
On equivalence and spectral multiplicity of some Gaussian processes
Authors: Mitrovic Slobodanka
Published: August 2008

In this paper we consider some Gaussian second-order stochastic processes (continuous left and purely nondeterministic), in a separable Hilbert space and analyze conditions for these processes to be equivalent. Also, we connect some results of H. Cramer (from Structural and statistical problems for a class of stochastic processes, Princeton Univ. Press, Princeton, NJ, 1971) concerning the problem of spectral multiplicity.
On some fractional derivatives of functions of exponential type
Authors: Trencevski Kostadin , Tomovski Zivorad
Published: August 2008

In this paper a new proof of the well known fact that the derivative of e " of order ? ? R is equal to ??e?x is given. It enables to conclude that sin(?)(x) = sin(x + ??/2) and cos(?)(x) = cos (x + ??/2) which is initial assumption (axiom) for the classical theory of fractional derivatives. Namely we use a new method for calculation of fractional derivatives of functions of exponential type.
On a sum involving the prime counting function 1/4(x)
Authors: Ivic Aleksandar
Published: August 2008

An asymptotic formula for the sum of reciprocals of ?(n) is derived, where ?(x) is the number of primes not exceeding x. This result improves the previous results of De Koninck-Ivic and L. Panaitopol.
Integral complete split graphs
Authors: Hansen Pierre , Melot Hadrien , Stevanovic Dragan
Published: August 2008

We give characterizations of integral graphs in the family of complete split graphs and a few related families of graphs.
On the seidel eigenvectors of a graph
Authors: Lepovic Mirko
Published: August 2008

Let G be a simple graph of order n and let ?1 > ?2 > . . > ?k and ?i > ?*2 > . . > ?k*be its main eigenvalues with respect to the ordinary adjacency matrix A = A(G) and the Seidel adjacency matrix A*= A*(G), respectively. Let nm = n?2m and n*m = n(?*m)2 for m = 1,2, ...,k, where ?m and n*m are the main angles of ?m and ?*m, respectively. Besides, let (x1(m) ,x2(m) ,...,Xn(m) ) and (s1(m) ,s2(m)..., sn(m)) denote the main eigenvectors of ?m and ?m*, respectively, so that ?I=1nxi(m) = ?nm and ?I=1n si(m) = ?n*m. In this work we show that xi(m) = (? k j=1 ?n*j si(j) /?*j + 2?m + 1)?nm and Si(m) (? k j=1 ?nj xi(j) /?*m + 2?j + 1)?n*m for i = 1, 2,..., n and m = 1, 2,..., k.
The fractal interpolation for countable systems of data
Authors: Secelean Nicolae-Adrian
Published: August 2008

In this paper we will extend the fractal interpolation from the finite case to the case of countable sets of data. The main result is that, given an countable system of data in [a, b] ? Y, where [a, b] is a real interval and Y a compact and arcwise connected metric space, there exists a countable iterated function system whose attractor is the graph of a fractal interpolation function.
Some identities for the Riemann zeta-function
Authors: Ivic Aleksandar
Published: August 2008

Several identities for the Riemann zeta-function ?(s) are proved. For example, if s = ? + it and ? > 0, then ??-??(1-21-s)?(s)/s?2 dt = ?/?(1-21-2?)?(2?).
Numerical construction of the generalized Hermite polynomials
Authors: Milovanovic Gradimir , Cvetkovic Aleksandar
Published: August 2008

In this paper we are concerned with polynomials orthogonal with respect to the generalized Hermite weight function w(x) = |x ? z|? exp(?x2) on R, where z?R and ? > ? 1. We give a numerically stable method for finding recursion coefficients in the three term recurrence relation for such orthogonal polynomials, using some nonlinear recurrence relations, asymptotic expansions, as well as the discretized Stieltjes-Gautschi procedure.
A class of reflexive cactuses with four cycles
Authors: Radosavljevic Zoran , Rasajski Marija
Published: August 2008

A simple graph is reflexive if its second largest eigenvalue ?2 is less than or equal to 2. A graph is a cactus, or a treelike graph, if any pair of its cycles (circuits) has at most one common vertex. For a lot of cactuses the property ?2 ? 2 can be tested by identifying and deleting a single cut-vetex (Theorem 1). if this theorem cannot be applied to a connected reflexive cactus and if all its cycles do not form a bundle, such a graph has at most five cycles. On the same conditions, in this paper we find some classes of maximal reflexive cactuses with four cycles. The complete case of four cycles, together with that of five cycles, is being settled in [10].