Aggregates extraction in Serbia: multiple structural breaks analysis

This short letter investigates the dynamics of aggregates extraction in Serbia between 1973 and 2015. The change point analysis identifies 5 structural breaks in the intercept and linear time trend of aggregates extraction: 1980, 1989, 1995, 2003 and 2009. The estimated break dates correspond to the major business cycle turning points of the Serbian economy in the last 40 years. These findings suggest how aggregates extraction industry in Serbia was largely affected by the overall economic activity between 1973 and 2015

The extraction of aggregates in Serbia, 1973-2015, a statistical exploration

We contribute to the fields of mineral economics, environmental and economic history in two respects: first, we construct a novel time series data set for the levels of aggregates extraction in Serbia between 1973 and 2015; the second, we estimate a change point ordinary least squares regression to model the dynamics of aggregates extraction in the aforementioned period. Our cliometric estimates are in great accordance with the major business cycle facts of the Serbian economy in the last 40 years. The most important policy implication of our results pertains to the potential slowdown of aggregates extraction from the onset of the Great Recession

Land cover changes of the Belgrade area over the past three centuries

This paper studies land cover changes of Belgrade, over the past three centuries. For this purpose, we applied an interdisciplinary approach by integrating historical and landscape ecological perspectives. We produced four reconstruction maps presenting land cover around the turn of the 18th, 19th, 20th and 21st centuries, based on historical maps and written sources. The conversion of land cover from historical maps was done based on CORINE Land Cover level 3, while Land Cover level 1 was used for displaying on the reconstruction maps. This allowed us to compare the changes that occurred from the turn of one century to the next. It was determined that land cover of Belgrade has transformed from dominantly semi-natural in the 18th century, to agricultural in the 19th century, and artificial in the 20th century. We determined that the driving forces of land cover changes were activities that were part of the political agendas of various states that governed Belgrade. The present analysis bridges the gap in the relevant literature on land cover changes in Belgrade in the long-term, and provides qualitative and quantitative results relevant for research-based management actions, planning processes and restoration ecology

An Automated Process of Creating 3D City Model for Monitoring Urban Infrastructures

This paper describes the process of designing models and tools for an automated way of creating 3D city model based on a raw point cloud.Also, making and forming 3D models of buildings. Models and tools for creating tools made in the model builder application within the ArcGIS Pro software. An unclassified point cloud obtained by the LiDAR system was used for the model input data. The point cloud, collected by the airborne laser scanning system (ALS), is classified into several classes: ground, high and low noise, and buildings. Based on the created DEMs, points classified as buildings and formed prints of buildings, realistic 3D city models were created. Created 3D models of cities can be used as a basis for monitoring the infrastructure of settlements and other analyzes that are important for further development and architecture of cities

WAR PAINTERS\u27 TASKS AT THE SERBIAN ARMY SUPREME HEADQUARTERS, 1914 — 1918,A CCORDING TO ARMY DOCUMENTATION AND MILAN A. MILOVANOVIĆ\u27S WORKS OF ART

A document entitled Instructions for Use of War Painters Al located to Suprelne Units Headquarters Battlefields, signed by duke Putnik, chief-of-staff, conlaio»ns istnrctions for war painter\u27s activities.Besides their docu»rentary value, the u o rk s of a >t ć.f Milan A. Mi lovanović from t he 1914 — 1915p eriod, i.e. ć! fcu > oil-painti>rgs and a nu»>ber of croquis and drawings presevi eđ are, beyond doubf, also of a considerable visua

Design of h-infinity proportional-integral thrust controller for ramjet engine

This paper presents the design of a thrust controller for a ramjet engine. The mathematical model for controller synthesis is based on a numerical solution of a set of nonlinear equations. Transfer functions of the engine are found for certain operation points defined by the altitude, Mach number and angle of attack. Local controllers are developed by using H-infinity control methodology, finally reduced to proportional-integral (PI) controllers. For gain scheduling, linear interpolation of parameters of the local PI controllers is used. Next, simulations are performed in order to show performances of the presented control algorithm

Design of h-infinity proportional-integral thrust controller for ramjet engine

This paper presents the design of a thrust controller for a ramjet engine. The mathematical model for controller synthesis is based on a numerical solution of a set of nonlinear equations. Transfer functions of the engine are found for certain operation points defined by the altitude, Mach number and angle of attack. Local controllers are developed by using H-infinity control methodology, finally reduced to proportional-integral (PI) controllers. For gain scheduling, linear interpolation of parameters of the local PI controllers is used. Next, simulations are performed in order to show performances of the presented control algorithm

Current swine respiratory diseases morphology in intensive swine production in Serbia

Swine respiratory diseases represent one of the most frequent health issues in pig production worldwide. Despite the great progress that has been made in the field of diagnostics, control and prophylaxis, respiratory diseases still remain the most challenging health problem in modern commercial pig production. The list of infectious agents that cause respiratory diseases in swine is extensive and includes both, bacterial and viral pathogens. In Serbia, more than fifteen years after the introduction of modern vaccines, the list of bacterial pathogens related to swine respiratory infections still include Mycoplasma hyopneumoniae, Actinobacillus pleuropneumoniae, Haemophilus parasuis and Pasteurella multocida. On the other hand, most commonly involved viral pathogens are Porcine Reproductive and Respiratory Syndrome Virus, Swine influenza virus, Porcine circovirus type 2 and Pseudorabies virus. The morphological features of pneumonia where several agents are involved, depend on the predominant etiological agent. Expanding knowledge of the main pathogens associated with swine respiratory diseases and the effects of their interactions on the disease outcome is important for further investigations of lung diseases and implementation of control strategies in commercial pig populations in Serbia. This review discusses the latest findings on swine respiratory disease and current trends in Serbian pig production

Chemical composition of the essential oil of Ziziphora clinopodioides Lam. (Lamiaceae) from Georgia

Taxa belonging to the Ziziphora L. genus are represented in the Caucasian flora [1,2] and are commonly used in traditional food and for medicinal purposes [2]. Ziziphora clinopodioides Lam. (Lamiaceae), known as blue mint bush is widespread in the Caucasus region and used to treat gastrointestinal disorders and as an aperitive, carminative, antiseptic and wound healing material [2]. To the best of our knowledge, there are limited data on the composition of Z. clinopodioides essential oil and no previous studies of the essential-oil constituents of Z. clinopodioides aerial parts from Georgia. The plant material used for the present study was collected near Jvari Monastery, Mtskheta, Georgia and subjected to hydrodistillation for 3 h using a Clevenger-type apparatus to produce the essential oil. The essential oil was analyzed by GC and GC-MS and this allowed the identification of 28 constituents representing 99% of the total detected GC-peak areas. The essential oil of Z. clinopodioides aerial parts from Georgia was found to be characterized by high levels of oxygenated monoterpenes, with the main components identified as pulegone (29.4%), p-menth-3-en-8-ol (15.2%), germacrene D (9.2%), neomenthol (5.6%), cis-pulegol (5.3%), menthofuran (4.5%), piperitenone (4.3%) and piperitone (3.1%). Pulegone, the most abundant constituent, is a widespread component of the Lamiaceae essential oils [3], however, it has been proven to be highly toxic to laboratory animals, primarily expressing pulmonary and hepatotoxic effects [4]. Having in mind that pulegone represents almost one-third of the oil, further toxicological studies of the Z. clinopodioides aerial parts essential oil are needed

Development of Small Electric Fixed-Wing VTOL UAV

During last years, along with development of electric propulsion systems, developments of multi-rotor unmanned aerial vehicles (UAV) are pushed strongly. The main benefits of this concept of UAV over standard helicopters are mechanical simplicity, decoupled dynamics and cheaper manufacturing, especially in small dimensions. On the other side, multi-rotor vehicles are less efficiency than fixed-wing vehicles, especially for long-distance flight. The traditional fixedwing UAVs can fly for long distances, but they require runways for take-off and landing. By combining vertical take-off and landing (VTOL) capabilities of multi-rotor vehicles and energy efficient long-distance flight of fixed wing vehicles, new type of UAVs is involved: VTOL UAV. This paper presents development of small electric powered fixed-wing VTOL UAV. This aircraft is the part of the project of large hybrid VTOL UAV by company EDePro and it is intended to be technology demonstration model and platform for testing VTOL and transition capabilities as well as autopilot and other systems and subsystems development