Wyniki wyszukiwania - Biblioteka Nauki

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FEM analysis of surface flaw of wire during drawing used in spring of automobile and medical instrument

100%

Yoshida K. , Shinohara T.

Hutnik, Wiadomości Hutnicze

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2005

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tom Vol. 72, nr 2

136-139

EN

The high surface quality of drawn wire and rods have been required from the field of automobile, machine and medical test. Using three-dimensional FEA, this study analyzed wire breaks that occurred in the drawing fine wires containing inclusion and flaws on the wire surface. The growth and disappearance mechanisms of flaws such as transversal cracks and scratches on a wire surface during wire drawing were investigated.

PL

Od drutów i prętów przeznaczonych do produkcji w przemyśle motoryzacyjnym i medycznym wymagana jest wysoka jakość powierzchni. W pracy przedstawiono trój-osiowy model odkształcenia ciała, analizowano pęknięcia występujące w cienkich drutach zawierających wtrącenia oraz wady powierzchni. Badano wzrost i mechanizm zanikania pęknięć poprzecznych i rys powstających na powierzchni drutu podczas procesu ciągnienia.

2

Sezonowa zmienność temperatur wód podziemnych drenowanych przez wybrane źródła w Karpatach wewnętrznych

75%

Szostakiewicz-Hołownia M.

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tom Vol. 63, nr 10/2

1085--1090

EN

Studies of spring waters, especially in mountainous areas, where there are no well boreholes, provide valuable information on the dynamics and chemistry of groundwater. The results of one and a half year monitoring of five selected springs located in the Inner Carpathians were presented in the article. All the springs drain cool, slightly alkaline waters with a low mineralization, which classifies them into acratopegae. In the ionic composition of studied waters bicarbonates, calcium, and magnesium are dominated. In particular, attention was drawn to changes in temperature, since their analysis allowed a relative assessment of the depth of water circulation drained by the springs

3

Analysis of long-term fluctuations in stream flow time series: An Application to Litani River, Lebanon

75%

Shaban A. , Telesca L. , Darwich T. , Amacha N.

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tom Vol. 62, no. 1

164--179

EN

Litani River is the largest river in Lebanon and has been affected by several physical and anthropogenic factors that influenced its flow dynamics. By means of the Singular Spectrum Analysis (SSA), the time dynamics of the stream flow of seven sites along the course of Litani River was investigated, extracting for each site the long-term trend. A clear decreasing trend characterizes all the long-term trends of the stream flow. Furthermore, several peaks were identified, consistent with the rainfall rate and snow cover variability.

4

Elementy sprężyste fazowników samoczynnych

63%

Cichosz P. , Karolczak P. , Kołodziej M. , Kowalski M. , Kuzinovski M. , Skowronek H. , Waszczuk K.

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tom R. 89, nr 10

1424--1425

PL

Przedstawiono wymagania, możliwości i uwarunkowania techniczne zastosowania różnych rodzajów sprężyn w fazownikach samoczynnych. Podano zalecenia do doboru sprężyn dla różnych rozwiązań konstrukcyjnych narzędzi.

EN

The paper presents requirements, opportunities and technical conditions to use different types of springs in self-acting beveling tools. They were given instructions to the selection of springs for various tools design solutions.

5

Delineating spring recharge areas inferred from morphological, lithological, and hydrological datasets on Quaternary volcanic landscapes at the southern flank of Rinjani Volcano, Lombok Island, Indonesia

63%

Setiawan O. , Sartohadi J. , Hadi M. P. , Mardiatno D.

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tom Vol. 67, no. 1

177--190

EN

Springs are a vital source of water supply in Quaternary volcanic environments, such as Rinjani Volcano on Lombok Island, and yet little is known about their emergence and recharge areas. Knowledge of spring recharge area can substantially support further spring analysis and management. This study was performed in two spring zones on the southern flank of Rinjani Volcano. It combined the available morphological, lithological, and hydrological datasets to build a conceptual model of the spring recharge areas. According to the analysis results, the conceptual model allowed to describe the flow medium, the aquifer type, and the characteristics of the flow system. The local morphology controlled the direction and gradient of groundwater flow to the springs. The analysis also revealed that the spring water in the study area was meteoric water, which mainly came from rainwater infiltration. Therefore, the boundaries of the spring recharge areas were represented by the morphological divides.

6

Reżim wydajności wybranych źródeł Austrii, Czech, Niemiec i Polski

63%

Moniewski P.

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2016

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tom Vol. 64, nr 7

472--480

EN

The long-term characteristics of the discharge regime in European springs are not well known yet. In presenting the springs, stress should be laid on their discharge variability and seasonality. The paper presents mean monthly discharges in 86 springs from four countries: Austria, the Czech Republic, Germany and Poland, measured over a period of several years. The analyses were based on discharge variability coefficients (V R, CV) and Markham's seasonality parameters: seasonality index and time of concentration. The results were interpreted with reference to three basic types of hydrogeological outflows: in karst, fissure and porous springs. The regime of most investigated springs is complex (57% of all springs), and nival supply clearly dominates over precipitation supply (49% vs.8 %). Nival supply dominates also among the springs with simple regimes, as a culmination of the discharge in 35% of these outflows was observed in the spring months. In the karst spring, characterized by higher seasonal discharge, it occurs on average about three weeks later than in the fissure springs. The seasonality index of the porous outflows is several times lower, and the discharge concentration time occurs at the beginning of May. Seasonal spring discharge wasfound to be correlated with the spring elevation; the discharge of springs located at higher elevations is characterized by greater seasonal variability and later concentration date.