scholarly journals Durability of airfield pavement cement concrete in the presence of de-icing agents

2018 ◽  
Vol 48 (1) ◽  
pp. 31-53
Author(s):  
Danuta Kowalska ◽  
Aleksandra Rumak
Keyword(s):  
Microstructural Analysis ◽  
Winter Season ◽  
Climatic Conditions ◽  
Chemical Compositions ◽  
Cement Concrete ◽  
Microscopic Evaluation ◽  
Deicing Chemicals ◽  
Cement Concrete Pavement ◽  
New Generation ◽  
Autumn And Winter

Abstract In Poland the climatic conditions in the autumn and winter season are particularly severe for concrete infrastructure. Concrete’s resistance to frost and chemical deicing agents determine the durability of cement concrete pavement. An increase in the premature deterioration of airfield pavements exposed to new generation deicing chemicals may suggest that there is a relation between the damages and the application of the deicers. The paper presents selected results of microstructural analysis of the airfield pavements concrete exposed to the deicers based on acetates and formates. Microscopic evaluation was carried out with the scanning electron microscope (SEM). The local chemical compositions of the phases of interest were performed using the Energy Dispersive X-ray analysis (EDX).

scholarly journals Model of obtaining key competitive advantages the companies of the fur and fur industry in the Russian market

2018 ◽  
pp. 03-19
Author(s):  
A. V. Lukyanova
Keyword(s):  
Role Play ◽  
Winter Season ◽  
Climatic Conditions ◽  
Competitive Advantages ◽  
Light Industry ◽  
Russian Market ◽  
Qualified Personnel ◽  
The Russian Federation ◽  
Autumn And Winter

The market of products from natural fur and skin takes a special place in the Russian market of clothes, first of all it is connected with that fact that this production is one of the most expensive of all type of goods of light industry, and also in connection with severe climatic conditions of the Russian Federation demand for products from natural fur and skin is high during an autumn and winter season. In article an attempt to analyse competitive strategy of players of the market pushno – the fur industry is made. Conclusions became results of research that for the companies of the fur and fur industry a key role play: 1) The known brand which causes positive associations in the client and installs confidence in the quality, offered production; 2) The wide model range offered on a choice of the client; 3) The qualified personnel which not only adjusts the consumer on purchase, but also can answer all questions concerning quality of production, the cut, actual trends, ruled socks, cleanings, storages, etc.; 4) Planning and registration of trade space (window dressing and effective zoning of space of shop).

scholarly journals MODEL OF OBTAINING KEY COMPETITIVE ADVANTAGES THE COMPANIES OF THE FUR AND FUR INDUSTRY IN THE RUSSIAN MARKET

2018 ◽  
pp. 27-43
Author(s):  
A. V. Lukyanova
Keyword(s):  
Role Play ◽  
Winter Season ◽  
Climatic Conditions ◽  
Competitive Advantages ◽  
Light Industry ◽  
Russian Market ◽  
Qualified Personnel ◽  
The Russian Federation ◽  
Autumn And Winter

The market of products from natural fur and skin takes a special place in the Russian market of clothes, first of all it is connected with that fact that this production is one of the most expensive of all type of goods of light industry, and also in connection with severe climatic conditions of the Russian Federation demand for products from natural fur and skin is high during an autumn and winter season. In article an attempt to analyse competitive strategy of players of the market pushno – the fur industry is made. Conclusions became results of research that for the companies of the fur and fur industry a key role play: 1) The known brand which causes positive associations in the client and installs confidence in the quality, offered production; 2) The wide model range offered on a choice of the client; 3) The qualified personnel which not only adjusts the consumer on purchase, but also can answer all questions concerning quality of production, the cut, actual trends, ruled socks, cleanings, storages, etc.; 4) Planning and registration of trade space (window dressing and effective zoning of space of shop).

scholarly journals Changes in Air Temperature and Snow Cover in Winter in Poland

Atmosphere ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 68
Author(s):  
Arkadiusz M. Tomczyk ◽  
Ewa Bednorz ◽  
Katarzyna Szyga-Pluta
Keyword(s):  
Snow Cover ◽  
Air Temperature ◽  
Winter Season ◽  
Primary Objective ◽  
Climatic Conditions ◽  
Cover Depth ◽  
North Eastern ◽  
Northern Regions ◽  
Maximum Air Temperature ◽  
Snow Cover Depth

The primary objective of the paper was to characterize the climatic conditions in the winter season in Poland in the years 1966/67–2019/20. The study was based on daily values of minimum (Tmin) and maximum air temperature (Tmax), and daily values of snow cover depth. The study showed an increase in both Tmin and Tmax in winter. The most intensive changes were recorded in north-eastern and northern regions. The coldest winters were recorded in the first half of the analyzed multiannual period, exceptionally cold being winters 1969/70 and 1984/85. The warmest winters occurred in the second half of the analyzed period and among seasons with the highest mean Tmax, particularly winters 2019/20 and 1989/90 stood out. In the study period, a decrease in snow cover depth statistically significant in the majority of stations in Poland was determined, as well as its variability both within the winter season and multiannual.

Stress Analysis of Cement Concrete Pavement under Overweight Loads

2012 ◽  
Vol 446-449 ◽  
pp. 949-953
Author(s):  
Ya Ni Lu ◽  
Tao Li Xiao
Keyword(s):  
Finite Element ◽  
Regression Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Concrete Pavement ◽  
The Other ◽  
Tension Stress ◽  
Statistical Regression ◽  
Cement Concrete ◽  
Cement Concrete Pavement

Special load has produced serious damage to the concrete pavement because of the great gross weight and heavy axle load, but the present specification has not mentioned this kind of load. On this occasion, Several conditions of critical load are identified through ANSYS finite element model analysis and the formula through statistical regression analysis to the bottom maximum tension stress is drawn up. Which can not only guide the concrete pavement design under the special load but also the result may be referred by the other kinds of engineering.

Field survey on frost damage to roof tiles under climatic conditions

2016 ◽  
Vol 34 (2) ◽  
pp. 135-149 ◽  
Author(s):  
Chiemi Iba ◽  
Ayumi Ueda ◽  
Shuichi Hokoi
Keyword(s):  
Field Survey ◽  
Winter Season ◽  
Frost Damage ◽  
Climatic Conditions ◽  
Weather Data ◽  
Measured Temperature ◽  
Content Type ◽  
Roof Tile ◽  
Deterioration Process ◽  
The Impact

Purpose – Frost damage is well-known as the main cause of roof tile deterioration. The purpose of this paper is to develop an analytical model for predicting the deterioration process under certain climatic conditions. This paper describes the results of a field survey conducted to acquire fundamental information useful to this aim. Design/methodology/approach – A field survey of roof tile damage by freezing was conducted in an old temple precinct in Kyoto, Japan. Using detailed observations and photographic recordings, the damage progress was clarified. To examine the impact of climatic conditions upon the damage characteristics, weather data and roof tile temperatures were measured and logged in the winter season. Findings – The deterioration process was observed under the climatic conditions associated with the measured temperature of the roof tiles. In particular, it was revealed that the orientation has a significant influence on increasing or decreasing the risk of frost damage. For certain distinctive forms of damage, the deterioration mechanisms were estimated from the viewpoint of the moisture flow and temperature distribution in the tile. Originality/value – This study contributes to the elucidation of the mechanism behind frost damage to roof tiles. The findings will guide the construction of a numerical model for frost damage prediction.

Grass silage: A comparison of the changes involved in the ordinary, molasses and A.I.V. processes

1937 ◽  
Vol 27 (2) ◽  
pp. 151-161 ◽  
Author(s):  
W. Morley Davies ◽  
G. H. Botham ◽  
W. B. Thompson
Keyword(s):  
Winter Season ◽  
Grass Silage ◽  
Autumn And Winter

The object of this communication is to give an account of an experiment, carried through in the autumn and winter season of 1934–5, designed to determine the changes in composition involved in making silage by the ordinary, molasses and A.I.V. processes. The changes in composition included those of both crude as well as digestible nutrients.

scholarly journals Soil and Leaf Nutrients Drivers on the Chemical Composition of the Essential Oil of Siparuna muricata (Ruiz & Pav.) A. DC. from Ecuador

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2949
Author(s):  
Juan I. Burneo ◽  
Ángel Benítez ◽  
James Calva ◽  
Pablo Velastegui ◽  
Vladimir Morocho
Keyword(s):  
Gas Chromatography ◽  
Chemical Composition ◽  
Secondary Metabolites ◽  
Essential Oil ◽  
Chemical Elements ◽  
Climatic Conditions ◽  
Gas Chromatography Mass Spectrometry ◽  
Chemical Compositions ◽  
Leaf Nutrients ◽  
First Time

Chemical compositions of plants are affected by the initial nutrient contents in the soil and climatic conditions; thus, we analyzed for the first time the effects of soil and leaf nutrients on the compositions of the essential oils (EOs) of Siparuna muricata in four different localities in Ecuador. EOs were obtained by hydrodistillation and analyzed by gas chromatography/mass spectrometry (GC/MS) and a gas chromatography/flame ionization detector (GC/FID). Enantiomeric distribution by GC/MS was determined, modifying the enantiomeric separation of β-pinene, limonene, δ-elemene, β-bourbonene, cis-cadina-1 (6), 4-diene and atractylone. A total of 44 compounds were identified. The most representative for L1 were guaiol, atractylone and 4-diene; for L2, cis-cadina-1(6),4-diene and myrcene; for L3, atractylone, myrcene and germacrene B; and finally, L4 germacrene B, myrcene and cis-cadina-1(6),4-diene. Correlations between soil- leaf chemical elements such as Al, Ca, Fe, Mg, Mn, N and Si in the different localities were significant with chemical composition of the essential oil of Siparuna muricata; however, correlations between soil and leaf K, P, and Na were not significant. Cluster and NMDS analysis showed high dissimilarity values of secondary metabolites between four localities related with changes in soil- leaf nutrients. Thus, the SIMPER routine revealed that not all secondary metabolites contribute equally to establishing the differences in the four localities, and the largest contributions are due to differences in guaiol, cis-cadina-1(6),4-diene, atractylone and germacrene. Our investigation showed for the first time the influences of altitude and soil- leaf chemical elements in the chemical composition of the EOs of S. muricata.

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