Browsing by Subject "risk"

Now showing 1 - 12 of 12

Access status: Open Access ,
An estimation of soil erosion rate hot spots by integrated USLE and GIS methods - a case study of the Ghiss dam and basin in northeastern Morocco
(Wydawnictwa AGH, 2022) Taher, Morad; Mourabit, Taoufik; Bourjila, Abdelhak; Saadi, Omar; Errahmouni, Ali; Marzkioui, Fouad El; Mousaoui, Mhamed El
Soil erosion is a major factor leading to dams' siltation and reducing their storage capacity. This study mapped the hot spots of soil erosion areas to predict the soil erosion/siltation in the Ghiss basin/dam (northeastern Morocco). In this context, various data has been prepared in the geographical information system for the estimation of soil erosion by integrating the universal soil loss equation (USLE). The result of this study revealed that soil loss rate ranges between 0 and 19 t∙ha−1∙yr−1. Therefore, the hot spots in the soil erosion area are to be found upstream, potentially leading to dam siltation over time. To avoid Ghiss dam siltation, we suggest terrace farming and reforestation in the soil erosion area hot spots.
Access status: Open Access ,
Considerations regarding global environmental risk taxonomy and assessment
(2009) Băbut, Gabriel; Moraru, Roland Iosif; Cioca, Lucian-Ionel
Based on a critical analysis of literature, the paper has as goal to highlight the basic elements, which should be taken into account in assessing a coherent framework for assessment and classification of global environmental risks. In order gather the attention of professionals in this field of concern, a rather unemployed approach is used, based on the analogy with characters and situation specific to Greek mythology. In correlation with the above- mentioned issues, in the final section of the paper, an attempt is made to develop a management strategy of global environmental risks.
Access status: Restricted ,
Koherentne miary ryzyka
(Data obrony: 2013-10-18) Sumara, Tomasz
Wydział Matematyki Stosowanej
Access status: Open Access ,
Kryteria prawdy i użyteczności informacji w modelach zarządzania w warunkach niepewności i ryzyka
(Wydawnictwa AGH, 2005) Gil, Zdzisław
In this paper there is presented the model of making decisions in the company where its condisions is unstable. Then the decidend is forced to make quick decisions based on information not always reliable and complete. There is a conflict between effective managment in the case of a risk and an aversion to some action within a group of decidends which causes a risk. This paper presents some suggestions how to mitigate the conflict.
Access status: Open Access ,
Kształtowanie ryzyka zawodowego związanego z hałasem na stanowiskach pracy w podziemnych wyrobiskach eksploatacyjnych
(Wydawnictwa AGH, 2011) Kapusta, Mariusz; Szponder, Tadeusz
The article presents the results of the noise measurement at selected workplaces in coal mines. The employer is obliged to identify, evaluate and estimate occupational risk, resulting from existing hazards. To analyze the exposure of workers to noise, a group of mining division employees was selected. The main source of noise in excavations comes from machines and technological processes associated with mining of the body of coal. Risk assessment was carried out with use of the PN-N-18002 norm, which enabled to estimate the size and the degree of risk acceptability, while allowed to determine prevention methods. In addition, the article compares actual and tabulated values of noise for various mining machinery.
Access status: Open Access ,
Methods of limiting selected risk types in the municipal waste incineration plant
(Wydawnictwa AGH, 2019) Kubińska-Jabcoń, Ewa; Niekurzak, Mariusz
Risk has become one of the most important categories in the global economy. This term belongs to the most popular phenomena in the economy. Decision making is always connected with risk. It is an inseparable part of human history and there are no man's actions which cannot be associated with it. The notion of risk is universal: it concerns political, economic and social activities. It takes on specific meaning in the space of economic activity: taking risk entails certain financial consequences. Due to this fact, the essence of risk, methods of its evaluation, as well as its management are the topics of a growing number of publications in various scientific fields. The key problem for an entrepreneur is to first determine sources of risk, to assess its size and the influence it may have on the business, and then-to take action in order to minimize this influence. The article analyses dangers in a municipal waste incineration plant. In incineration plants there are various risks but environmental threats, broadly analysed in this article, belong to the most serious ones. Two independent risk analysis methods have been used for this purpose to determine the most serious threats related to environmental risk and options of counteracting them.
Access status: Open Access ,
Metoda oceny bezpieczeństwa obiektów oceanotechnicznych zorientowana na ocenę zachowania się obiektu i ocenę ryzyka wypadku. Procedura zarządzania bezpieczeństwem obiektu
(Wydawnictwa AGH, 2011) Gerigk, Mirosław
The paper concerns the safety of seaborne transportation and is devoted to safety of ocean engineering objects and ships in damaged conditions at sea. A method (procedure) of safety assessment of damaged objects (ships) is presented. The method is oriented on the object performance and risk assessment. For the risk assessment the risk based techniques are applied including the Formal Safety Assessment FSA introduced by IMO. The method (procedure) is based on application of the holistic approach to safety. An influence of factors affecting safety following from the different sources (design, operation, management, human factor) is taken into account. The holistic risk model is implemented which enables to estimate the risk of not surviving a collision (grounding, stranding, terrorist attact, etc.) using the object (ship) performance assessment during the accident. The event tree analysis ETA is used for the risk assessment. The different scenarios of accident are used and they include the hazards, intermediate events, additional events and consequences. The risk estimation is based on the matrix risk model. The safety measure in the method (procedure) is the level of risk. The risk assessment (RA, QRA) is conducted using the risk acceptance criteria (RAC) in the form of either the risk matrix or ALARP concept. The risk assessment is associated with using the risk control options (RCO) as well. Within the method safety is the objective.
Access status: Open Access ,
Metodyka analizy ryzyka opłacalności inwestycji górniczo-energetycznej w warunkach niepewności na przykładzie złoża Legnica Wschód
(Wydawnictwa AGH, 2011) Woźniak, Justyna Ewa; Jurdziak, Leszek
Development of domestic energy industry based on brown coal requires new investments. Growing prices of $CO_{2}$ emission allowances and closing moment of the necessity of their purchase on auctions cause, that electric energy production out of brown coal become more and more risky business. For 20 equally probable models of the Legnica-East lignite deposit obtained from conditional simulation (module ConSim in Datamine Studio 3) process of Lerchs-Grossmann pit optimisation was carried out (NPVScheduler) leading to 240 ultimate pits in 12 groups obtained for different lignite price levels. Data about amount of overburden and lignite inside these pits and lignite quality (quality indicator QI) were used in Monte Carlo simulation process (R/Risk and Crystal Ball) to assess the influence of parameters describing the planned mine and power station (treated as random variables with selected distributions) on non-discounted financial results of a mine, a power station and a vertically integrated energy producer for 12 scenarios describing future market conditions of their operations (2 electric energy prices, 6 levels of $CO_{2}$ emission allowances: 0-300 PLN/Mg $CO_{2}$). Obtained histograms allowed for calculation of probability of their profits maximisation for selected pits, probability of losses and determine influence of examined parameters and scenarios on profit levels and risk connected with its achievement. Analysis was carried out in the Institute of Mining Engineering at Wroclaw University of Technology in frame of realized PhD thesis.
Access status: Restricted ,
Ocena efektywności działań ochronnych i naprawczych PWiK w Częstochowie w celu zapobiegania zanieczyszczeniu eksploatowanych zasobów wód podziemnych
(Data obrony: 2018-07-23) Rybiński, Kacper
Wydział Geologii, Geofizyki i Ochrony Środowiska
Celem pracy była analiza skuteczności działań ochronnych i naprawczych podejmowanych przez PWiKOCz SA w Częstochowie. Ich zadaniem jest zapobieganie zanieczyszczaniom eksploatowanych zasobów wód podziemnych, które w rejonie Częstochowy ujmowane są z triasowego, jurajskiego oraz czwartorzędowego piętra wodonośnego. Przedstawiono strukturę funkcjonowania oraz warunki geologiczne i hydrogeologiczne w rejonie działalności PWiKOCz. Problemem w aspekcie jakości wód są ponadnormatywne stężenia azotanów, chromu, bromków, żelaza i manganu. Potencjalnym ogniskiem zanieczyszczeń jest także ropociąg biegnący przez obszar działalności PWiKOCz. W pracy omówiono również działania bezpośrednie mające na celu redukcję stężeń zanieczyszczeń w stacjach uzdatniania wody oraz działania pośrednie w postaci tworzenia stref ochrony ujęć wód oraz prowadzonej działalności naukowo-badawczej i edukacyjnej.
Access status: Open Access ,
Risk and trust. Food-related concerns and »good« food procurement strategies. From research into eating practices in Poland
(Wydawnictwa AGH, 2018) Straczuk, Justyna
The article discusses how risk and trust – interpreted as social phenomena characteristic of the late modernity era – are reflected in the concerns related to everyday food choices of residents of Poland. It postulates a link between the perception of food-related threats and the meanings associated with different food procurement practices, and the specifics of a local value system and its historical determinants. Based on the analysis of responses from 70 interviewees speaking about food-related concerns, it outlines diverse strategies for verifying food choices and the types of trust that are granted to various social actors who take part in the production and distribution of food. Since the strategies and forms of trust are largely associated with social and cultural assets of consumers, the article also brings into focus their stratifying aspect, as well as levels of overall trust in people, institutions and abstract systems.
Access status: Open Access ,
Ryzyko i długa pamięć w modelach warunkowej wariancji
(2008) Gurgul, Henryk; Syrek, Robert
Celem artykułu było zbadanie przydatności modelu FIAPARCH do wyznaczania wartości narażonej na ryzyko. Badania potwierdziły występowanie zjawiska długiej pamięci w zmienności stóp zwrotu. Dlatego klasyczne modele, które nie uwzględniają tego zjawiska: (model RiskMetrics, GARCH, APARCH) mogą być traktowane tylko jako pierwsze przybliżenie. Adekwatne wyniki daje dopiero model FIAPARCH, który umożliwia uwzględnienie ułamkowej integracji szeregu warunkowej wariancji, a także efektu dźwigni. Do opisu warunkowego rozkładu reszt wykorzystano rozkład t-Studenta oraz jego skośną wersję, co pozwoliło na uchwycenie „grubych ogonów” i asymetrii. Tak skonstruowany model stał się podstawą do oszacowania wartości narażonej na ryzyko. Porównanie wyników testów potwierdziło wyższość modelu FIAPARCH nad modelami nieuwzględniającymi choć jednego z wymienionych wyżej czynników.
Access status: Restricted ,
Zarządzanie ryzykiem portfela aktywów o grubych ogonach
(Data obrony: 2011-10-28) Spadło, Renata
Wydział Matematyki Stosowanej