In order for a project to be built with respect to quality, budget compliance and execution time - all required conditions, a professional management of site-level operations is required. The technical complexity, the importance of performing the work on the set deadline, the resource constraints and the substantial costs require the planning, programming and rigorous control of all the works.
The coastline of Zemmouri Bay on the northeast coast of Algeria with about 50 km of shoreline has been eroding since 1970. Changes of the sandy shoreline are continuous and occur at diverse spatial and temporal scales. This erosion is a major crisis and it potentially impacts the coastal population and natural environment. In order to understand and predict these morphological changes, an accurate description of sediment transport by waves and currents and shoreline change is important. This paper presents a comprehensive study of wave refraction, current-driven sediment transport and shoreline change. Results show that the study area exhibits a great variety of shoreline evolution trends, with erosion prevailing in the eastern and central sectors and stability or even accretion in the Western area.
This article presents a method for the quick assessment of the safety of the road on an active landslide on the Just mountain at Tęgoborze using the landslide hazard ratio of landslide movements. The hazard indicator for landslide traffic has been defined as the quotient of the largest displacements obtained from measurements using a terrestrial laser scanner to the largest displacement obtained from a numerical model of the worst geotechnical conditions and an unstable landslide. The application of this indicator was presented on the example of national road No. 75 along the section of the road in km from 51 + 900 to 52 + 700 at the location of the Just mountain at Tęgoborze in the south of Poland. The road is located on an active landslide and has a lot of traffic. The measurements were conducted with the RIEGL. VZ400 terrestrial laser scanner from 2012 to 2016. As a result of the measurements performed with a terrestrial laser scanner, a cloud of 3D points was obtained. Differential models of subsequent measurements were constructed and compared to the first base measurements. The results of 3D differential models obtained from terrestrial laser scanner measurements were compared with results obtained from 3D numerical modelling. Numerical calculations were conducted assuming the worst geotechnical conditions. The model of the landslide was fully saturated. A numerical simulation computed using the finite element method (FEM) in the MIDAS GTS program was applied. A result of the safety factor F = 0.8 (i.e. an unstable landslide) was obtained. In order to estimate the hazard, the values of the landslide hazard indicator were determined for each date using the measurements conducted with the laser scanner.
This paper is an attempt at reconstructing Stanisław Witkiewicz’s creative method on the basis of his scattered writings. The Zakopane style has become a phenomenon across a broad spectrum of Polish national styles. The inspirations for classical national styles were typically arbitrarily selected sets of forms taken from a specific historical style associated with a given nation or state. It was often an eclectic set – enriched with elements derived from other styles. Stanisław Witkiewicz consistently avoided borrowing and copying, confining himself solely to drawing inspiration from the folk art of Podhale. In the methodology of his architecture, rational elements (exposing the structure, stressing hygiene) interweaved with ornamentation, predominantly featuring floral themes and elements of a specific mythology.
This paper presents a synthesis of research carried out by authors on local materials used in construction over time in South Eastern Romania. The earth in various forms and technologies has been a perfectible building material that by technologies and specific procedures confers resistance and structural stability. For the research the authors have selected a few specific types of buildings detailing on structural compliance, their sustainability and the factors that led to the depreciation of the building.
Every firm today is facing significant problems which are a consequence of the influence of external and internal factors. This necessitates strategic changes in its activities, which focus on the development of the basic elements of intangible assets - people, knowledge and system, whose effective combination allows building competitive advantage and company growth. The main, specific intangible resource of the company is the business model itself, which is the economic basis of the strategic behavior of the company. From this point of view the purpose of the study is: 1) developing a sustainable business model for the construction firm, 2) analyzing the mechanism by which the manager creates and/or develops his own sustainable business model, taking into account the specifics of the construction market.
The dynamic changes in the external (and often inside) environment place every firm in front of serious new and unknown challenges and make it more difficult to adapt to them. Under these conditions known traditional short-term models of corporate behavior have an increasingly limited role and a chance for success. The main problem and goal of the company should be a clearly defined long-term strategy that allows building competitive advantages and performance. Therefore, the purpose of the study is to analyze the impact of a dynamic external environment (market) on strategic behavior by developing a conceptual model: “Dynamics of the external environment (market) - Strategic behavior - Competitive advantages” to be applied and tested in the activity of the construction firm.
Parabens are synthetic preservatives that are used on a large scale in the cosmetics, pharmaceutical and food industries. Their task is primarily to prolong the shelf life of selected products – cosmetics, medicines or food – by maintaining their microbiological purity. Parabens protect products against deterioration and microorganisms, extending their durability by up to several months without interfering with their composition and operation. Parabens do not change the aroma, taste, density or other characteristics of cosmetic or food products. However parabens, which occur in most cosmetics with a creamy or liquid formula (face creams, body lotions, foundation, tonics, lipsticks, deodorants, perfumes), are becoming increasingly worse because of the prolonged list of side effects that they may cause. The presence of intact paraben esters in human body tissues has now been confirmed by independent measurements in human urine, and the ability of parabens to penetrate human skin intact without breakdown by esterases and to be absorbed systemically has been demonstrated through not only in vitro studies but also in vivo investigation using healthy human subjects.
This paper deals with effect of number and position of friction dampers on seismic response of 2D steel frame. For the present study four structures with six storeys are subjected to a time history analysis. For each story are using two, four and six friction dampers with different positions keeping slip load and stiffness constant. To study the effect of number and position of dampers in structures, are analysed the time period, top roof displacement, maximum base shear and percentage energy dissipated in accordance with energy induced in the frame. The results indicate that number and placement of damper affects the structural response. A large number of dampers do not always lead to best benefit in terms of energy dissipation.