bluuebunny/crossref_metadata_2025 huggingface dataset:
A pilot scale study of a sequencing batch reactor treating municipal wastewater operated via the UP-PND process
Authors: Kornaros M. , Marazioti C. , Lyberatos G.
Published: August 2008

SBRs are usually preferred as small and decentralized wastewater treatment systems. We have demonstrated previously that using a frequent enough switching between aerobic and anoxic conditions and a specific to the treated wastewater aerobic to anoxic phase ratio, it is possible to by-pass the second step of nitrification (i.e. conversion of nitrite to nitrate nitrogen). This innovative process for nitrate by-pass has been branded as UP-PND (University of Patras-Partial Nitrification Denitrification) (WO 2006/129132). The proved methodology was successfully transferred from a lab-scale SBR reactor treating synthetic wastewater to a pilot-scale SBR system treating real wastewater. In this work we present the results from the operation of this pilot-scale SBR, constructed in the Wastewater Treatment Plant of Patras (Greece), using 6-hour, 8-hour and 12-hour cycles. It is demonstrated that three pairs of aerobic/anoxic phases with a relative duration of 1:2 (8-hour cycle) and 2:3 (12-hour cycle) secures the desired by-pass of nitrate production.
Superoxide Dismutase, Lipid Peroxidation, and Bell-Shaped Dose Response Curves
Authors: McCord Joe M.
Published: August 2008

Cellular metabolism generates the cytotoxic superoxide free radical, O2·−, and a family of enzymes called superoxide dismutases (SOD) protects us from O2·− by catalyzing its conversion to O2 and H2O2. Superoxide production increases in a wide variety of pathological states, especially those involving inflammation or ischemic injury. Most of the literature has described systems wherein added or over expressed SOD produced beneficial effects, yet in some circumstances SOD provided no benefit, or was clearly detrimental, exacerbating cell injury or death. When broad dose-response studies were finally possible in models of reperfusion injury in the isolated heart, hormesis became clear. We propose that the mechanisms underlying the hormesis are related to the paradoxical abilities of the superoxide radical to serve as both an initiator and a terminator of the free radical-mediated chain reaction that results in lipid peroxidation. Lipid peroxidation is a universal feature of oxidative stress, causing loss of cellular structure and function. Under any given conditions, the optimal concentration of SOD is that which decreases chain initiation without elimination of the chain termination properties of the radical, resulting in a minimum of net lipid peroxidation. Mathematical modeling of this hypothesis yields predictions fully consistent with observed laboratory data.
Static strength of the shear connectors in steel-concrete composite beams: Regulations and research analysis
Authors: Rankovic Slobodan , Drenic Dragoljub
Published: August 2008

The paper reviews the most important analytic expressions, on the basis of the developed industrial countries' contemporary literature, for determination of strength of shear connectors in steel-concrete composite beams. The mechanism of possible failure and basic criteria used for defining of the shear connecter strength at composite slabs and composite slabs with profiled sheet. Special analysis has been done in the expressions and recommendations given by Eurocode 4 in the area of shear connecter strength, both elastic and rigid. For ail the presented regulations, a comparative analysis with our standing standard (JUS) addressing this area is given. Along with the comparative review of the regulations, a commentary on the strength of the shear connectors in composite beams is given.
Engineering education in Serbia, problem identification and proposals for solution
Authors: Andjus Vojo , Stojic Dragoslav
Published: August 2008

Tins paper deals with Serbian higher education, especially in engineering, and with modern tendencies in the globalization of European engineering education based on Bologna Declaration. The main goal of this paper is to explain the existing system of engineering education in the Republic of Serbia: Scientific Universities with different Technical Faculties and Higher vocational technical schools. History of engineering education in the Republic of Serbia from the first Engineering Schools in 1846, then the Technical Faculty of Great School in 1863 and finally the University in 1905 will he presented as well as a comparative analysis of other relevant Universities (Technical) in Europe. Special focus will be done on the present state of affairs in the above-mentioned education with concrete measures for improvement of engineering education according to the actual European tendency. At the same time a necessity and a need for rapid, rational and efficient reforms and restructuring of Serbian higher education, especially in organizational, financial and educational domain, will be discussed.
Analysis of timber frames with localized nonlinearities
Authors: Mesic Esad
Published: August 2008

A methodology of nonlinear analysis of timber frame structures with flexible connections has been developed in this paper. The methodology is based on the results of experimental investigation of connections behavior under static and cycling loading. The adopted numerical method is based on the concept of localized nonlinearity which facilitates the reproduction of the experimentally determined connections behavior in the analysis of frame structures. The methodology is also applicable to other types of timber structures.
Contribution to the design of bolted angle connection in the steel structures
Authors: Velickovic Dragan
Published: August 2008

The paper presents the equations for the determination of the neutral axis position, when it is on the face, that is, on the bearing plate, and for the highest normal tensile stress in the fastener, as well as for the determination of highest and lowest normal compressive stress occurring on the face, that is bearing plate when the neutral axis is outside the face that is, the bearing plate. Which of these three possible cases will occur depends solely on the force field occurring in the given cross-section for the dimensioning of the joint. The connection is effected by the face or bearing plate, depending on the task being solved and the bolt fasteners. The expressions for the calculation of the said connections are derived for the general case when all three forces intersecting, M, T and N, in the cross section given for their dimensioning, are other than zero or any one of them is other than zero. The paper also presents a tabular presentation of the results for all of the three possible cases of the force fields, that is, the stress fields most frequently occurring in the civil engineering building practice at these joints.
City center organization and its influence on the city structure
Authors: Mitkovic Petar , Dinic Milena
Published: August 2008

A city center is a starting and end point of numerous and various movements of a city, so called "basic paths focus". Therefore, it is strained by the tensions of the centrifugal and centripetal courses of the city and its denizens. The center unifies variety of high and low level activities, and concentrates the characteristics of a wider area and imposes a high degree of social communication and contact. In each city tissue, the center represents the most attractive and unique ambient unit, due to a high concentration of various activities taking place in it. The center regardless of its characteristics, functions and category, exists only as a part of an urban system - it is functionally connected to the gravity area and structurally to the city as a system.
The application of the facade thermal insulation systems during the energy conservation remedial measures of the structures being heightened
Authors: Bogdanovic Veliborka , Samardzic Slobodan
Published: August 2008

Bearing in mind the fact that during the design and construction of the additional stories to the residential buildings the standards about the heat technology in the civil engineering were not met for the entire structure and very often not even for the additional stories of the structure, we deemed that it is necessary to emphasize the possibility of the heat balance improvements through the application of the facade thermal insulation systems on the non-insulated facade walls. That this concept is valid, is supported by the fact that in practice, the aesthetic and functional repairs of the existing facade walls of the heightened buildings, offer a favorable substrate (basis) for the application of the facade thermal insulation systems and offers an opportunity for the regular remedial measures of the building, from the aspect of energy issues. Therefore, the objective of the study is the quantification of the participation of the facade walls in the heat balance in several typical procedures of the heightening of residential buildings, and the analysis of the possibility of a correction by the application of the FACADE THERMAL INSULATION SYSTEMS. Thus, the relevant parameters of the heat balance for the previous status of the building were analyzed for several characteristic building heightening cases, and they were compared to the parameters after the additional application of the facade thermal insulation systems. The research results on the structures-models have been illustrated with sketches, graphs, diagrams and tables.
Functional analysis of the existing school buildings in the rural settlements of the city of Nis
Authors: Stankovic Danica , Bogdanovic Ivana , Tanic Milan
Published: August 2008

Criteria for evaluation of the existing school buildings registered in the rural settlements of the city of Nis have been formed, by defining the relevant parameters for evaluation from different aspects, such a conditions at location, functional-organizational and architectonic-engineering characteristics of the buildings. On the basis of the established criteria and the formed data base, which consists of the systematized documentation about the existing buildings, the research that had to discover the extent of presence of certain organizational units in the existing village school buildings and the ways of their functioning was conducted. The results of this research have been presented in this paper.
Characteristic structures of the industrial buildings from the XIX-XX centuries and technical interventions for the re-utilization
Authors: Lepel Adrienn
Published: August 2008

This paper analyses the technical interventions needed for the re-utilization of late industrial buildings. It reviews the characteristic structures of the industrial buildings from the XIX.-XX. centuries and the methods to be used for the refurbishment. The main goal of the research is to create a collection in the form of tables summarizing the characteristic structures of the industrial buildings and the methods of their examination and refurbishment that may be used not only theoretically, but also practically for the planning of such re-utilizations.
Balkan environmental atlas
Authors: Cekic Nikola
Published: August 2008

This paper points out an extremely delicate urbarchitectonic-environemental drama, with innumerable global complex situations. There seems to be little hope for improvement in the actual living environment where the condition, in the developmental sense of the term, grows less and less sustainable. Very frequent conferences organized at all quarters of the world, with important declarations and recommendation do not manage to curb the increasingly evident crisis. The author points out to the need to create new action conditions in the Balkans and argues for the creation of a singular coordinated, environmental Atlas of the Balkans, an important document, with bases of key data, so that a better quality of life in micro and macro ambience units could be achieved. Therefore, striving for a different, new reality which will not be based on the declarative principles, but on the scientific research and academic education.
Physical environment factors and their impact on the cognitive process and social behavior of children in the preschool facilities
Authors: Stankovic Danica , Milojkovic Aleksandar , Tanic Milan
Published: August 2008

The problem researched in this paper refers to the promotion of the evaluation system in the designing of the pre-school facilities, and the issue is approached from the psychological aspect, in order to investigate the potential for improvement of this kind of structures. In the paper, the systematization of the physical environment factors and their influence on the cognitive processes and the social behavior of children in the pre-school facilities. The conclusion is that the quality of architectonic design, that is, the quality of organization and materialization of the designed physical environment of the pre-school premises correlates with the positive developmental results of the children.
The design of glued laminated timber footbridge structure according to Eurocodes
Authors: Stojic Dragoslav , Cvetkovic Radovan , Stojic Nikola
Published: August 2008

The paper presents the conceptual design of the footbridge made of laminated wood. The supporting system of the main bearing elements is made of the laminated wood in the system of arch with three joints and the bridge deck is made of the composite timber concrete structure system. The load patterns for which the dimensions of the supporting bridge structures were adopted (verified according to Eurocode) are presented.
Changing the function of industrial buildings: Survey
Authors: Lepel Adrienn
Published: August 2008

The paper analyses the re-use of defunct industrial buildings paying special attention to the examples to be found in Budapest. It gives an account of the fate of the industrial buildings having lost their function and the reasons of the changes as well as the conditions promoting and hindering such changes in the function. The main goal of the research work is to elaborate a system of conditions enabling the analysis of the implemented re-uses and the various buildings using uniform criteria and the comparison of the various examples. The system of conditions extend to the grouping by the usual functions, but consider the location, the monument protection features, the floor-plan and the ownership of the property as well. The systematization assists the reuse and the changing of the function and, in addition, it can expediently be used to the scientific analysis of the implemented re-use and the classification as well.
Advanced river water quality monitoring stations at the Moravica river in Serbia
Authors: Djordjevic Dj. , Milicevic D. , Velickovic B. , Gruber G. , Kainz H. , Londong J. , Kaub M. , Martens J.
Published: August 2008

The overall objective of this project is the immediate enhancement of the water quality management in Serbia as an example of excellence for the South East Balkan region. Therefore, close links between the local and regional economy and the Serbian Higher Education sector will be created through technology and knowledge transfer. New technologies like GPRS Technology to realize data transfer from distance hydro measure stations will be introduced in the water quality monitoring management. Outcomes of the project are a measurement program for Advanced River Water Quality Monitoring, a pilot station and operator staff for the realization of the monitoring scheme devices including GPRS-Technology for the monitoring scheme, a monitoring station to conduct a test run, a quality management scheme, training measures for operators of monitoring stations, analyzed data from measurement program and dissemination and networking measures like a final international conference. The project is funded within the scope of the Tempus Program (Tempus Cards Structural and Complementary Projects) of the EU.
Peripheral settlements and how to create a new identity for them: An experiment as an initial point for the future development
Authors: Maric Igor
Published: August 2008

There are many lands of peripheral settlements: peripheral settlements of cities, municipalities, or close to the country borders. Their genesis, position and connections are different, so that their role in the network of settlements is frequently marginalized, A general idea that these settlements are an encumbrance and that they are very often not arranged and rejected as important urban units has resulted in their significant degradation. This paper deals with their general categorization by position, size, economic and other features. For the purpose of their revitalization, programs are proposed - experimental pilot project which would be used for future considerations in creating development strategies. Even though the experiments are often Utopian and unrealistic, this paper suggests the projects which would be sustainable in terms of existing circumstances and resources. The point is to modernize the traditional values and economy and to introduce monitoring and development monitoring, to centralize and coordinate the experiment and have professionals of various specialties exchange their knowledge and experience. The focus of consideration is the development of contemporary livestock keeping and organic food oriented agriculture, as well as tourism, special services, crafts, folklore products. The basic concept is connecting the small capacities into middle sized and big systems, improvement of living conditions, specific and alternative advantages of living and working in small communities, reconstruction etc. .
Flexible organization of floor composition and flexible organization of dwelling space as a response to contemporary market demands
Authors: Jovanovic Goran
Published: August 2008

The paper presents the application of the principle of flexibility of architectonic space on the concrete example of flat composition. This example demonstrates that with a proper choice of structural spans dimensions and regular arrangement of sanitary and ventilation vertical assemblies, a structure with high flexibility in terms of flat space organization and floor space organization, can be achieved.
Determination of the characteristic parameters in the special collinear space in the general case
Authors: Krasic Sonja , Markovic Miroslav
Published: August 2008

The projective space consists of the finitely and infinitely distant elements. The special collinear spaces in the general case, are set with five pairs of biunivocally associated points, so the quadrangle in the first space obtained by the three principal and one penetration point of the remaining two through the plane of the first three identical or similar to the associated quadrangle obtained in the same way in the second space. In order to associate two special collinear spaces, it is necessary to determine the following characteristic parameters: vanishing planes, space axes (principal normal lines), foci (apexes of the associated identical bundles of straight lines) and directrix plane (associated identical fields of points). The paper is based on constructive processing of the special collinear spaces in the general case. The structural methods which are used are Descriptive Geometry (a pair of Mange's projections) and Projective geometry.
Re-viewing cityscapes
Authors: Kostres Milica , Maras Igor , Jelicic-Atanackovic Jelena
Published: August 2008

The aim of this paper is to provide an introduction of an analytical method for aiding urban design, in light of both theoretical and empirical background. The method proposed is based on the attempt to bring the aspects and dimensions of physical form in a tighter relationship with those of urban activities, movements, processes and functions. With an aim to be promoted as a significant design tool, the analytical experiment based on a form of mapping was examined in the context of Ribarsko ostrvo, a peninsula on the Danube river in Novi Sad.
Technical performance indicators, IWA best practice for water mains and the first steps in Serbia
Authors: Radivojevic Dragan , Milicevic Dragan , Petrovic Ninoslav
Published: August 2008

Active water loss management has became one of the primary interest of the water utilities in the world. It can make significant saves and investments in new water resources capturing can be justified only if appropriate action is done to minimize loss from the water main. There is some level of unavoidable water loss from the water main. Traditional indicator of water loss, widely adopted in the world, was % of the system input value. It always sounds well to have water loss less than some prescribed value (for instance 10%). Due to efforts of IWA Task Force in the last decade, this approach has been proven to be misleading in may cases, and new way of performance measuring and benchmarking is proposed. This paper presents the basic principles of this methodology and the results of the first step in attempt to approach Serbian water mains to the new standards.
Post-traumatic stress disorder and coping strategies in psychotraumatized refugees
Authors: Cavic Tamara , Lecic-Tosevski Dusica , Pejovic Mirko
Published: August 2008

Introduction. In extreme life events basic assumptions are frequently reassessed and changed. Therefore, trauma requires re-education. Effective coping strategies enable individual to tolerate, minimize, accept or ignore what one cannot manage and to moder?ate the consequences of stressful, traumatic events. Materials and Methods. The aim of this study was to evaluate coping strategies in refugees with post-traumatic stress disorder prior and after group cognitive-behavioural therapy. The sample included 70 refu?gees who experienced multiple stressors such as organized violence, ethnic conflicts, bombing, expelling from their homes and life in exile. Impact Event Scales-Revised, Ways of Coping-Revised, Scale of Cognitive Self-regulation and Scale of Coping Strategies were administered before and after six months of group cognitive-behavioural therapy. Results. Post-traumatic stress disorder in refugees after therapy significantly decreased. Cognitive self-regulation was improved by moving locus of control from external to internal resources. Coping was qualitatively different, with a wider repertoire of adaptive strategies. Discussion. Cognitive group work facilitates processes of grieving, working-through of traumatic material, increasing emotional awareness and developing creativity in coping. Conclusion. Our findings highlight the positive impact of cognitive-behavioural treatment on post-traumatic stress disorder and post-traumatic adjustment. .
Descriptive-epidemiological characteristics of lung cancer in Serbia
Authors: Maksimovic Natasa , Spanopoulos Kyriakos
Published: August 2008

Introduction. Lung cancer represents the most common malignant tumour among men, and appears more and more frequently among women in many countries worldwide. The aims of this descriptive epidemiological study were to evaluate the mortality trends of all malignant tumours and lung cancer in Central Serbia from 1990 to 1999, and to estimate the incidence, mortality and the basic demographic characteristics of lung cancer in Central Serbia in 1999. Material and methods. The source of data concerning cancer cases in 1999 was the Cancer Registry of Central Serbia, while data of the Republic Statistics Institute were used for the analysis of mortality trends for the period 1990-1999. All rates were standardized by the direct method, to the world standard population. Confidence intervals for mortality rates were assessed with 95% level of probability. Linear regression coefficient was determined by Fisher's test. Results. The mortality rates showed rising tendencies for both lung cancer (y=-1876.26+0.96x, p=0.028 for men; y=654.78U).33x, p-0.001 for women) and all malignant tumours (y=-4139.88+2.15x, p=0.163 for men; y=3649.68 + 1.88x, p=0.016 for women), with statistically significant increase being observed for all trends, except all malignant tumours among men. In the year 1999, lung cancer ranked first among men and third among women, with 29.2% and 10.3% of cancer mortality respectively. The age-specific mortality rates were much higher in men in all age groups. Mortality increased with age and the highest rates were found in the age group 70-74 for both sexes. The highest incidence and mortality rates were reported in Belgrade, Moravicki and Sumadijski district. .
Labour after intracytoplasmic sperm injection
Authors: Tabs Dunja , Vejnovic Tihomir , Kopitovic Vesna , Tabs Nada
Published: August 2008

Introduction. The aim of our study was to describe labour characteristics after intracytoplasmic sperm injection programe. This is the first study of those deliveries at the Department of Gynecology and Obstetrics in Novi Sad. Patients and methods. Subjects were 73 parturients and their babies from the intracy?toplasmic sperm injection programe (48 singletons, 22 twins and 3 triplets), delivered from January 1st, 2001 to December 31st, 2006. Results. At the Department of Gynecology and Obstetrics in Novi Sad, 0.65% of all deliveries are those from assisted reproductive programes. 30.67% of all labours after assisted reproductive programes are after intracytoplasmic sperm injection. One half of all labours after intracytoplasmic sperm injection are twins. The mean age of women is 33-34. More than 95% of all babies were delivered by Cesarean section. Discussion. The most frequent pathologies in labours after intracytoplasmic sperm injection are hypertensive disorders and premature rup?ture of membranes. There is still a matter of debate what is a real cause for those pathologies, especially for hypertension (age of woman, laboratory factors and/or induction of ovulation). Conclusion. At the Department of Gynecology and Obstetrics in Novi Sad, one third of all deliveries after assisted reproductive programe are after intracytoplasmic sperm injection. The most frequent pathologies after intracytoplasmic sperm injection are hypertensive disorders, which is similar to findings of other authors. The mean age of women is also similar to the mean European age of women after intracytoplasmic sperm injection. .
The importance of health education in prevention of oral health in children
Authors: Igic Marija , Apostolovic Mirjana , Kostadinovic Ljiljana , Trickovic-Janjic Olivera , Surdilovic Dusan
Published: August 2008

Health Education. The aim of education is to impart knowledge on the causes of disease and decay of the teeth and periodontium, on the ways and possibilities of disease prevention and adequate treatment; to point out to the necessity of proper nutrition, regular and proper oral hygiene, proper use of fluoride products as well as to the significance of regular check-ups with a dentist. Nutrition. Frequent intake of carbohydrates leads to a higher prevalence of caries. Taking into consideration that it is neither obtainable nor recommendable to completely eliminate glucoses from the nutrition components, it is necessary to advice parents and children to take glucose (if possible) only along with the regular meal when the saliva flow is increased. Oral Hygiene. In order to establish oral hygiene as an important prophylactic measure influencing successful protection of oral health of the whole population, it is necessary to inform as many people as possible about oral hygiene effectiveness and its necessity in preventing oral and dental diseases; to develop the habits of regular oral hygiene maintenance in the youngest children as well as to refer them to the use of most adequate paraphernalia and agents for performing the daily oral hygiene procedures. Fluoride prophylaxis. Undoubtedly, fluoride is currently the most efficient agent for the prevention of dental pathology. The anticaries efficacy of fluoride is a consequence of the cumulative effect of several different mechanisms. They can occur on the dental surface or directly influence the mineral phase in the enamel. Each dental hygiene preventive program must include the content about the use of fluoride as the basic prophylactic measure. It is recommended to be the sum of the combined effect of systemic (endogenic) and local (exogenic) application. Conclusion. Regarding high prevalence of caries in children, the issue of prophylaxis is of great significance and current interest. In that respect, health education should point out to the significance of proper nutrition, regular oral hygiene and fluoride prophylaxis, all aimed at preventing denial diseases. It is certain that parents must take an active part in these activities both as educators and controllers of the proposed measures. .
Prenatal diagnosis of varix of the fetal intraabdominal umbilical vein: Case report
Authors: Novakov-Mikic Aleksandra , Stojic Sinisa
Published: August 2008

Varix of intraabdominal part of fetal umbilical vein is during a prenatal ultrasound scan seen as a hypoechogenic mass between anterior abdominal wall and lower edge of liver, and the diagnosis is confirmed when blood flow is seen during color Doppler examination. A case of prenatal diagnosis of this abnormality is presented, with review of contemporary literature regarding diagnosis and management as well as the outcome of such pregnancies.
Lynch syndrome I: A case report
Authors: Zivkovic Vesna , Katic Vuka , Gligorijevic Jasmina , Andjelkovic Zlatibor , Petrovic Aleksandar , Krstic Miljan
Published: August 2008

Introduction. Hereditary nonpolyposis colorectal cancer (HNPCC), also known as Lynch syndromes J and II, accounts for about 5-8% of colorectal cancers. Lynch syndrome I is an autosomal domi?nant inherited disorder characterized by early onset of colorectal cancer, predominance of proximal and multiple tumors, and microsatellite instability. In order to identify HNPCC, the international "Amsterdam criteria" have been used. Case report. The proband was a 40-year-old male who was admitted to hospital with a diagnosis of advanced rectal cancer. Left colectomy was carried out. A histopathologic diagnosis of poorly differentiated adenocarcinoma of clinical stage Dukes C was made. The family talking was done and it was revealed that the pro-band had five family members (one of first degree relative) with colorectal cancer, and two successive generations affected. All malignancy were diagnosed before 45 years of age. In one family member, metachronous transverse cancer was revealed 12 years after surgery for cecal adenocarcinoma. Discussion and conclusion. The main molecular cause for HNPCC is constitutional mutation in one of the mismatch repair (MMR) genes that regulate the excision of errors occurring during DNA replication. The most often are mutations of MLHI and MSH2 genes, and microsatellite instability is present in about 90-95% HNPCC. In this report, we present a case of an HNPCC patient who met the Amsterdam criteria for Lynch syndrome I. Family members that fulfill the Amsterdam criteria should be investigated for mutation in MMR genes. The genetic tests are not routinely available, so colonoscopic screening of all asymptomatic family members older than 25 has been recommended.
A survey on integral graphs
Authors: Balinska Krystyna , Cvetkovic Dragos , Radosavljevic Zoran , Simic Slobodan , Stevanovic Dragan
Published: August 2008

A graph whose spectrum consists entirely of integers is called an integral graph. We present a survey of results on integral graphs and on the corresponding proof techniques.
On a lower bound of Jensen’s functional
Authors: Pavlovic Mirjana , Radenovic Stojan
Published: August 2008

We investigate some estimates of the integral J Log / (e*e) |^, if the polyonomial f (z) has a concentration at low degrees measured by the lp?quasi-norm, 0 < p < 1.
Antiregular graphs are universal for trees
Authors: Merris Russell
Published: August 2008

A graph on n vertices is antiregular if its vertex degrees take on n ? 1 different values. For every n ? 2 there is a unique connected antiregular graph on n vertices. Call it An. (The unique disconnected antiregular graph on n vertices is Acn.) The main result of this note is that every tree on n vertices is isomorphic to a subgraph of An.
Some considerations in connection with Kurepa's function
Authors: Malesevic Branko
Published: August 2008

In this paper we consider the functional equation for factorial sum and its particular solutions (Kurepa's function K(z) [3] and function K1(z)). We determine an extension of domain of functions K(z) and K1(z) in the sense of Cauchy's principal value at point [2]. In this paper we give an addendum to the proof of Slavic's representation of Kurepa's function K(z) [6]. Also, we consider some representations of functions K(z) and K1(z) via incomplete gamma function and we consider differential transcendency of previous functions too.
The eigenspace of the eigenvalue -2 in generalized line graphs and a problem in security of statistical databases
Authors: Brankovic Ljiljana , Cvetkovic Dragos
Published: August 2008

We introduce the notion of the L-core of a graph what enables a simple description of some properties of the eigenspace of the eigenvalue ?2 in generalized line graphs and an elegant formulation of the solution of a problem in the security of data in statistical databases.
4-regular integral graphs avoiding ±3 in the spectrum
Authors: Stevanovic Dragan
Published: August 2008

We determine all connected 4-regular integral graphs avoiding ?3 in the spectrum. There are exactly 16 bipartite and 8 nonbipartite such graphs. The smallest bipartite one is K4,4, while the largest has 32 vertices. Among these graphs there are two triplets of cospectral nonisomorphic graphs and two pairs of cospectral nonisomorphic graphs. The smallest nonbipartite one is K5, and the largest has 15 vertices. Among these graphs there is a pair of cospectral nonisomorphic graphs.
Hamiltonianicity of the towers of Hanoi problem
Authors: Zivkovic Dejan
Published: August 2008

In this paper we analyze a variant of the n-disk Towers of Hanoi problem with an arbitrary starting and ending configuration using transition graphs representing valid configurations. In particular, we show that starting with any configuration, there is a sequence of moves that goes through each valid configuration exactly once and back to the starting configuration. Also, we show how the original Towers of Hanoi problem can be solved in any number of moves between 2n - 1 and 3n - 1 inclusive.
The generalized Heronian mean and its inequalities
Authors: Guan Kaizhong , Zhu Huantao
Published: August 2008

In this paper, a class of ratio inequalities for the generalized Heronian mean of two numbers are established. Some Ky Fan type inequalities are also proved. We define the generalized Heronian mean in n variables, whose properties, including Schur-convexity, are investigated.
Simultaneous editing and multilabelling of graphs in system newGraph
Authors: Brankov Vladimir , Cvetkovic Dragos , Simic Slobodan , Stevanovic Dragan
Published: August 2008

In our research in spectral graph theory we often encounter the need for the simultaneous editing of two or more interdependent graphs (e.g. a graph and its line graph), together with multiple labellings of their vertices and edges. Occasionally, labellings are of such kind that it could be beneficial to permit the user to modify the labelling and test whether it still satisfies a given property. Here we develop a methodology for treating such situations, which is implemented in system newGRAPH.
Comparative analysis of gynaecological status of workers from textile and metal industry
Authors: Milovanovic Aleksandar , Dotlic Jelena , Jakovljevic Branko , Milovanovic Jovica , Petkovic Slavica , Corac Aleksandar , Blagojevic Tatjana
Published: August 2008

Introduction Female workers in textile and metal industry are exposed to various physical and chemical hazards that can lead to the occurrence of gynaecological diseases. Objective The aim of this study was to estimate the frequency of gynaecological diseases among workers of textile and metal industries. METHOD The investigation comprised 197 female workers, 148 from textile and 49 from metal industry, aged from 26 to 57 years. All subjects were hospitalized based on non-gynaecological diagnoses. Gynaecological diagnoses included: tumours of the genital organs and breasts, cervical ectopy and lacerations, inflammatory diseases, disturbances of static of genital organs, cysts, and irregularities of menstrual cycle. Results Textile workers were significantly younger than metal workers, but the groups were comparable according to total and exposure work-time, qualifications and diagnosis on hospital admission. Gynaecological diseases were diagnosed among all investigated subjects. About 80% were diagnosed with tumours and inflammatory diseases. A highly statistically significant difference was observed among groups according to the presence of cervical ectopy and lacerations, which were more frequent among textile workers. Conclusion Comparison of gynaecological status of workers revealed that, among textile workers, cervical ectopy and lacerations were more frequent than among workers in metal industry. .
Epidemiological analysis of demographic characteristics and type of injuries in patients with multiple trauma with respect to conclusive treatment outcome
Authors: Zagorac Slavisa , Bumbasirevic Marko , Lesic Aleksandar , Milosevic Ivan
Published: August 2008

Introduction Multiple trauma is one of the leading causes of mortality and morbidity in the population of people under 45 years of age. The consequences of multiple trauma have huge epidemiological, social and economic significance. Objective The aim of the paper was to analyze the conclusive treatment outcome of multiply traumatized patients with respect to their sex, age, injury mechanism and type. METHOD This retrospective study included 100 patients with multiple injuries (ISS>16) treated in the Emergency Room of the Clinical Centre of Serbia in the course of 2004. Clinical, X-ray, laboratory and numerical presentation methods - scores (ISS and GCS) were used to show the injury severity. Results Most of the injured were males (80%), and the average age was 40?20 (5-83). Out of the total number of patients who died, 23 (82%) were males, and 5 (18%) were females. The average age of the patients with fatal outcomes was 48?21 (8-86). Traffic accidents were the leading cause of injury (59%). The median GCS was 10?3 (3-15). The average ISS was 30 (20-66) in the surviving patients, and 53 (27-77) in those who died. Conclusion With respect to sex, in most cases multiple trauma affects males (p<0.01), with the average age of about 40. With respect to injury mechanism, the main cause of the occurrence of multiple trauma is traffic accidents (p<0.01). There is a statistically significant difference in the values of GCS and ISS relative to the definitive outcome (p<0.01). Statistical data processing indicated that there was a statistically significant correlation between mortality and type of injury in a given organic system (p<0.01), but that there was no statistically significant correlation between mortality and age. .
Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL): Three case reports from Serbia
Authors: Zidverc-Trajkovic Jasna , Lackovic Vesna , Pavlovic Aleksandra , Bajcetic Milos , Carevic Zvonko , Tomic Gordana , Mandic Gorana , Mijajlovic Milija , Jovanovic Zagorka , Sternic Nadezda
Published: August 2008

Introduction Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a hereditary microangiopathy leading to recurrent strokes and vascular dementia in young and middleaged patients. The diagnosis of CADASIL is based on typical clinical presentation and characteristic magnetic resonance imaging (MRI) changes, and has to be confirmed by biopsy of the sural nerve, muscle and skin, as well as by genetic analysis. Mutations within the Notch3 gene were identified as the underlying genetic defect in CADASIL. Case Outline The clinical manifestations of the first presented patient with migraine from the age of thirteen, stroke without vascular risk factors and stepwise progression of vascular dementia comprising the typical clinical picture of CADASIL, were confirmed after seven years with pathological verification. The second presented case did not satisfy the clinical criteria for CADASIL. His stroke was considered to be related with vascular risk factors - diabetes mellitus and hypertension. The aetiological diagnosis was established only when his brother without vascular risk factors presented with similar clinical manifestations. Conclusion Until the development of the new neuroimaging techniques like MRI, pathologic and genetic analysis, CADASIL was considered as a rare disorder. However, the increasing number of CADASIL families has been identified throughout the world showing that this entity is usually underdiagnosed. This article presents three patients from two Serbian families with clinical suspicion of CADASIL verified by pathologic examination. .
Incidental finding of malignant renal cystic tumour diagnosed sonographically
Authors: Stojanovic Milan , Goldner Branislav
Published: August 2008

Introduction Malignant cystic renal tumor is a rare variant of renal malignancy. Cystic neoplasm results from haemorrhage, necrosis and colliquation of a solid tumour or tumour occurring within the wall of a cyst. That pathoanatomic substratum reflects characteristic sonographic features indicating its malignant nature. It is important to distinguish a simple cyst (not requiring surgery) from intracystic malignant lesion because it requires surgery. Case Outline The authors present a 59-year-old woman with a sonographic finding of a simple cyst in the upper pole of the right kidney revealed during gynaecological ultrasonography. Immediately afterwards, the radiologist performed renal sonography and its finding was a cystic lesion suggestive of malignancy. Further evaluation by CT scan showed that the lesion was clearly malignant. After surgery, the histological finding verified cystic renal cancer. Conclusion Ultrasonography may reveal a complex cyst and solid mass but requires an experienced sonographer. Contrast CT scan would be performed to examine the "suspicious" lesion because it clearly shows if a cystic lesion is benign or malignant. .
Stone use in Roman towns: Resources, transport, products and clients: Case study Sirmium: First report
Authors: Djuric Bojan , Davidovic Jasmina , Maver Andreja , Müller Harald
Published: August 2008

The project work in 2006 season included the analysis of stone monuments held at the Museum of Srem as well as their documentation. For limestone used at Sirmium at least two sources were established: Lithotypes I and III came from the Dardagani quarry along the Drina River, while Lithotype II most probably came from the wider area of Pannonia along the Danube. White marble was coming to Sirmium from the 1st to the 3rd century predominantly from the Eastern Alps (Gummern, Pohorje), from the end of the 3rd century also from the Mediterranean (Luni, Paros, Dokimeion, Proconnesos), while colored marble, tied to the imperial architecture at Sirmium, was being imported from imperial and other quarries across the Mediterranean (North Africa Italy, Asia Minor, Greece).
Stone material of regional provenance from Sirmium
Authors: Riznar Igor , Jovanovic Divna
Published: August 2008

The stone artefacts from Sirmium, held at the Museum of Srem, were sampled and analyzed in order to establish an archaeological database connected with Roman quarries and possible transport routes along the Sava and Danube Rivers. Of the artefacts made of Neogene limestone three lithotypes were identified. Two of them were determined as originating from the known Roman quarry in the Drina Valley (NE Bosnia). For the third lithotype and its subtypes a model of the hypothetical quarry is proposed, the location of which is suggested to be outside the Drina river basin. Beside limestone, the sampled artefacts also revealed two types of porous volcanoclastic rocks of andesitic composition, which supposedly originate from two different microlocations in the Drina river basin.
(francuski) Les temples payens de Sirmium
Authors: Jeremic Miroslav
Published: August 2008

(farncuski) Les ?difices de culte pa?ens ont ?t? ici consid?r?s en distinguant deux groupes selon leur position par rapport aux remparts. Le premier de ces groupes incluant les ouvrages situ?s en dehors de l'enceinte a d?j? fait l'objet de plusieurs publications de sorte que ce travail se contente de rappeler bri?vement leurs principales caract?ristiques au d?but du texte. Lorsqu'il s'agit du Sirmium intra muros, nonobstant la pr?sence de vestiges de murs massifs et de plastique architecturale d?corative dans la partie centrale de la ville antique autorisant d'envisager la pr?sence de temples pa?ens, l'ensemble de la litt?rature publi?e ne fait aucune mention de tels ?difices. Les r?sultats d'une analyse a posteriori du mat?riel arch?ologique enregistr? dans la documentation conserv?e ? l'Institut arch?ologique de Belgrade, ainsi que l'observation du mat?riel lapidaire et d?coratif des d?p?ts du Mus?e du Srem ? Sremska Mitrovica ont permis ? l'auteur de ce travail de constater (avec toute la r?serve voulue dans ses conclusions) que l'espace situ? ? l'est du forum accueillait, pour le moins quatre temples pa?ens. L'existence de ces ?difices de culte a ?t? situ?e au sein de divers intervalles compris entre le IIe et le IVe si?cle. Il est int?ressant de noter que le plus ancien d'entre eux (IIe si?cle), d?gag? sur le site 42, ?tait dot? d'une construction portante en bois. Un peu plus au nord ont ?t? exhum?s les vestiges d'un ?difice de culte (59) datant du IIIe-IVe si?cle qui pourrait ?tre identifi? avec un fanum gallo-romain, mais cela restera pour l'instant de l'ordre de l'hypoth?se. Plus ? l'est, sur une vaste plate-forme en dalles de marbre ont ?t? ?rig?s vers la fin du IIIe ou au d?but du IVe si?cle deux autres temples (sites 43 et 47). Malheureusement un certain nombre de questions, entre autres relatives ? leur structure et leur d?dicace, ne pourrons ici trouver une r?ponse d?finitive. De toute ?vidence, deux de ces temples (sites 47 et 59) ou du moins leurs vestiges ont ?t? mis ? profit, dans la premi?re moiti? du Ve si?cle, lors de l'?rection de deux ?glises, ce qui ouvrent la question tr?s int?ressante mais d?licate de la localisation des ?glises Sainte-Anastasie et Saint-D?m?trius, que les sources mentionnent dans le contexte de l'activit? de b?tisseur de Leontius qui, en tant que nouveau pr?fet de l'Illyricum, a rejoint Sirmium, depuis Thessalonique, une vingtaine d'ann?es avant la prise de la ville par les Huns en 441.
The textile industry at Krsevica (Southeast Serbia) in the fourth-third centuries B.C.
Authors: Popovic Petar , Vranic Ivan
Published: August 2008

The site of Kale at Krsevica, with significant remains of a settlement dating to the late Classical and early Hellenistic periods, has yielded, in addition to other finds, more than a thousand loom weights, spindle whorls and spools of which 1038 pieces are typologically classified. This material provides evidence for the craft of weaving in the settlement in the fourth and early third centuries B.C.