Floods are the most common natural disasters on the territory of Bulgaria. As a temporary flooding of a significant part of the land as a result of the action of natural forces, destruction of hydro technical facilities (dam walls, dams) or other critical situations (accidents), these are events with a great possibility of prevention and mitigation of negative effects, since unlike other natural disasters, they are highly predictable. In many cases, the timing, nature and expected sizes can be determined in advance, which, together with the preparation of the population for response and crisis management measures, are part of the complex activity of Flood Protection. The researched information system for water management is part of the measures for the effective management of the risk of floods in the territory of the Municipality of Burgas, as the most frequently occurring disaster in the territory of the Municipality, related to large material damages, destruction and casualties. Photos of the operation of the system in real conditions of rising waters of the monitored water bodies are presented, as well as the actions aimed at controlling the negative effects of the disaster.
Journal section: TECHNICAL FACILITIES FOR ENSURING SECURITY
During out work in a project related to European security, we have created various devices. One of them is a sensor for control of contaminations in the composition of fogs, which is first of its kind in the world. The development of such a sensor is important because in this project, artificially generated fogs with special additives are used for decontamination, and it is crucial to control the quantity of impurities in these fogs. In this work, different aspects of the operation of this sensor, its advantages and design considerations are discussed.
The article deals with technological development, especially with thermal imaging. The authors are convinced, that this technology can progressively and qualitative influence operations of security forces and crisis response teams. The article is divided into 3 main parts, where first chapter generally describes thermal imaging, second chapter deals with current applications and last chapter sets the perspectives for future.
Automatic classification of seismic sources finds vast application security domain. Due to restricted computational power in the edge devices a robust and less complex features need to be extracted and sent to appropriate classifier. Such features are histograms of oriented gradients. It represented the relative spectral distribution of derivative of amplitude against frequency instead of average spectral envelope.
The report discusses the main specific requirements for the design of sites related to the production and storage of explosives and ammunition. The minimum distances from the sites for explosives and ammunition to neighboring buildings and facilities are considered. Measures to reduce the risk of accidents are presented
The coefficients of reflection of acoustic signals from layered structures in an aqueous medium are determined. The measurements were made in the frequency range from 80kHz to 120kHz. The obtained results were used to reduce the sonar visibility of objects in the aquatic environment.
Distributed fiber optic sensing is known for the few last decades. One of the most interesting area in security field is Distributed Acoustic Sensing (DAS). Nowadays, DAS systems have deployments in many different areas like pipeline monitoring, seismic activity monitoring, or perimeter security monitoring. They can use existing optic fiber networks and create a distributed sensor from this fiber which can monitor areas all acoustic events along the fiber. This paper deals with the evaluation mea surement with a commercial DAS system used for perimeter security. The system was evaluated on university optical fiber test polygon and three different events were classified–man jumping, man walking and car driving along the fiber route. Based on the measurement and another post-processing also the speed of movement can be determined.
The performance of two automatic gain control circuits is compared in an underwater acoustic receiver: a low-power hardware gain control and a software-controlled gain control that disables the gain change for a predetermined time interval after a valid signal level. Binary digits “0” and “1” are transmitted using bursts of the frequencies 33kHz and 43kHz, respectively, in two modes of operation. In the first mode, each digit is sent as one frequency burst followed by a pause. In the second mode, a frequency burst is transmitted at the beginning of a clock interval. Experiments are conducted in shallow waters. The results show that the hardware gain control circuit is suitable to equal time intervals between the transmitted bursts. The software gain control circuit allows arbitrary time intervals between the transmitted bursts. Increased power consumption of the device is detected as a disadvantage of the software gain control circuit.
Combat Unmanned Ground Vehicles (UGV´s) are platforms designed for the replacement of the human element on the battlefield. Their autonomy depends on their respective level of technical development. Many armies invest varying levels of effort into the development of prototypes and solutions of UGV´s. They have various abilities and limits. Th is article uses open sources while identifying the current global state of perspectives in the short term. The authors are convinced that artificial intelligence, military robotics, and its implementation into operational structures can disrupt the process of conflict and will have a strong impact on the ratio of forces in regions throughout the world.
The paper addresses the problem of acoustic signal classification and report the current state of the art in the field. More specifically the paper sheds light on the mathematical apparatus behind one specific method used for classification of sound sources – SVM (support vector machines). As well we propose use of histogram of oriented gradients (HOG) as features descriptor and explain how they work.
This paper summarizes the main results of a study on the current state and the development of electroshock less lethal weapons used in law enforcement. Based on statistics and studies, conclusions have been made about the taser-type devices effectiveness and safety with a view to their further improvement.
Evaluation of protective action of poisoned gas substances of new generated activated carbon for gas mask applicationpg(s) 75-77
The object of the paper is the dynamic adsorption of new type generated gas mask carbons for respiratory protection, based on apricot shells and the impact of the protective properties of some poisonous gases or warfare poisonous substances. A study performed examined the impact on the breakthrough times of different quantities of K2CO3 (2 mass.% – 8 mass. %) and ТЕDA in the capacity of additives to the impregnation composition of the standard ASC Whetlerite type and newly obtained carbons