Wyniki wyszukiwania - BazTech

1

Evaluation of Interfacial Tension in the Liquid Aluminum Alloy-Liquid Slag System

Suchora-Kozakiewicz M., Jackowski J.

Journal of Casting & Materials Engineering

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2017

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Vol. 1, no. 1

11--14

EN

In the present paper, the results from investigations regarding interfacial tensions present at the borders of a liquid aluminum alloy and two selected melted fluxes (mixtures of salts) are presented. The fluxes feature solidification characteristic curves that are very close to each other as well as differentiated chemical compositions. For the comparative investigations, the so-called surface property index (WS) is calculated for both fluxes with the use of the ion theory of slags. The investigations of the interfacial tensions were conducted on a stand that enabled the measurement of the force values accompanying the tearing-off of the probe from the interfacial surface. A very clear relationship between the interfacial tension values and the WS index values that characterize both fluxes was found. An increase in the WS index value resulted in an increase in the investigated interfacial tension values. It was also found that, in both cases under investigation, an increase in the system temperature value resulted in an increase of the values of the interfacial tensions present within. In the conclusion, we state that the metallurgical treatments (for instance, the recycling of the cast metal composite materials by way of component separation) should be conducted with the use of salt mixtures (fluxes) characterized with WS index and melting temperature values as low as possible.

2

Brazing Filler Metals of Limited-Noxiousness

Majewski D., Winiowski A.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2014

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Vol. 58, No. 5

2014--208

EN

The recent results of technological process and composition-related research performed at Instytut Spawalnictwa in Gliwice and dedicated to brazing filler metals and fluxes of limited noxiousness. The brazing properties of newly-developed low-melting cadmium-free silver filler metals in the form of flux-coated rods and low-fluoride fluxes. The quality and mechanical properties of joints brazed using the newly developed filler metals.

PL

Dotychczasowe wyniki badań recepturowo - technologicznych prowadzonych w Instytucie Spawalnictwa w Gliwicach nad spoiwami i topnikami do lutowania twardego o ograniczonej szkodliwości. Właściwości lutownicze nowo opracowanych niskotopliwych, bezkadmowych spoiw srebrnych w postaci prętów z otuliną topnikową oraz topników niskofluorkowych. Jakość i właściwości wytrzymałościowe wykonanych nimi złączy lutowanych..

3

Zastosowanie modelu LandscapeDNDC do symulacji warunków wodnych gleby oraz plonu roślin uprawnych

Nyćkowiak J., Leśny J., Juszczak R., Olejnik J., Blecharczyk A., Haas E., Kiese R., Butterbach-Bahl K.

Rocznik Ochrona Środowiska

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2013

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Tom 15, cz. 2

1937--1951

EN

The purpose of the work was to assess the results of simulation of soil water content (SWC) and the simulated crop yield quantity using a module LandscapeDNDC model which belongs to the family of DNDC models. The assessment was conducted on the outcome data gathered during the simulation carried out in the experimental plots of Agricultural Experimental Station in Brody (nearby Poznań, Poland) in the period of 28 March to 13 August 2012. The crops grown in the experimental fields were as follows: alfalfa, potatoes, winter wheat, rye and spring barley. Average daily content of water in the soil at the depth of 10 cm from 28 March to 13 August 2012 was 12.95 ± 0.52% (CI = 95%). This value was measured by the sensors installed in the automatic measurement site located 20–60 meters from individual experimental fields. This area in 2011/2012 was overgrown by low vegetation (monocotyledons and dicotyledons). Simulated average value of SWC for the experimental plots in the same period was 12.43 ± 0.85%. These results lead to a conclusion that the model correctly simulates water conditions of the soil. Simulations conducted in LandscapeDNDC brought the crop yield results which amounted from 64.4 to 116.1% of the specific actual crop yield. The crop yield quantity of spring barley was simulated most accurately, then the crops of alfalfa, winter wheat and potatoes. The measured quantity of winter rye crop yield (7.1 t ha-1) differs from national average quantity which was 2.4 t ha-1 in the years from 1999 to 2011. Such a big crop yield obtained in the experimental plot is rare in farming conditions, which results in the overestimation of the crop yield quantity by the model.

4

Próba oceny produktywności ekosystemu w warunkach polowych Wielkopolski

Kowalska N., Chojnicki B. H., Józefczyk D., Urbaniak M., Juszczak R., Olejnik J.

Rocznik Ochrona Środowiska

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2013

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Tom 15, cz. 3

2481--2495

EN

The Eddy Covariance technique has been applied for corn field NEE estimation. The Smith, Michaelis-Menten and Misterlich formulas has been used for calculation of net ecosystem exchange (NEE) values between corn canopy and the atmosphere. These approaches have been applied for estimation of temeparture and radiation modification impact on the corn field productivity. The NEE has been evaluated in the first part of this paper and then the relation of NEE runs and elements that influence the NEE values has been summarized. In another part the analysis of NEE under thermal and radiative conditions has been presented. The Michaelis-Menten model has been found as the most distinct one for the measurements of the relationship. This model indicated that the highest NEE value (NEE = 10.0 µmol m-2 s-1) has been found under combination of the low radiation and high temperature conditions. The lowest value of NEE has been estimated under the highest PPFD and lowest Ta amount. The applied models have confirmed relationship between NEE, PPFD and Ta. All three models confirmed the fact that the lowest ecosystem productivity is found under high radiation input. The accumulated NEE values were compared with the real values according to the Smith, Michaelis-Menten and Misterlich equations. The results of the Michaelis-Menten equation and Misterlich were the most similar to the real cumulative NEE values. The theoretical change of thermal (0.5°C increase) and radiation (4% decrease) resulted in tested higher CO2 sequesteration from the atmosphere.

5

Wpływ parametrów montażu na jakość i własności mechaniczne połączeń lutowanych powstałych z użyciem lutowania selektywnego

Sitek J., Kościelski M.

Elektronika : konstrukcje, technologie, zastosowania

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2013

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Vol. 54, nr 4

63-66

PL

W artykule ukazano wpływ parametrów montażu: rodzaju topników, powłok na płytkach drukowanych, rodzajów podzespołów THT, na jakość i wytrzymałość mechaniczną połączeń lutowanych powstałych z użyciem lutowania selektywnego i nowoopracowanych topników. Uwypuklono problemy technologiczne związane z lutowaniem selektywnym oraz ukazano czynniki, które mogą mieć na nie wpływ.

EN

The article shows the impact of assembly parameters: the type of fluxes, coatings on printed circuit boards, types of THT components, on the guality and strength of solder joints created using selective soldering and the newly developed fluxes. It was highlighted the technological problems as-sociated with selective soldering and showed the factors that impact it.

6

Stratification of particulate organic carbon and nitrogen in the Gdańsk Deep (southern Baltic Sea)

Burska D., Pryputniewicz D., Falkowska L.

Oceanologia

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2005

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No. 47 (2)

201-217

EN

Particulate organic carbon (POC) and nitrogen (PON) concentrations and fluxes were measured during an experiment in the Gdańsk Deep in late spring (30.05.-06.06.2001). The vertical POC and PON concentration profiles were characterised by the highest values in the euphotic layer, a gradual decrease with depth, and an increase below the halocline. The hydrophysical conditions had a decisive impact on POC and PON fluxes in the water column. Preferential removal of nitrogen from suspended mater was observed in the entire water column (maximum - in the vicinity of thermocline). There were also differences in the diurnal effectiveness of nitrogen removal as compared to carbon removal. The removal rate was highest at night.

7

Fluxes and balance of mercury in the inner Bay of Puck, southern Baltic, Poland: an overview

Boszke L.

Oceanologia

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2005

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No. 47 (3)

325-350

EN

The aim of the study was to analyse the balance of mercury (Hg), i.e. the content of this metal, its inflow and outflow, in the ecosystem of the Bay of Puck. Based on literature data and the results of the author's own study, this analysis has shown that the main source of Hg pollution is the atmosphere. An estimated 1.1-3.8 kg of Hg enters annually from the atmosphere, whereas the mass of Hg carried there by river waters per annum is about 7 times lower (0.13-0.44 kg year^-1). The 0.9-2.7 kg year^-1 of Hg released from Bay of Puck waters to the atmosphere is of the same order as the quantity deposited from the atmosphere. The total amount of Hg deposited in the upper (0-5 cm deep) layer of the sediments has been estimated at 240-320 kg, its rate of entry being c. 2.25-2.81 kg year^-1. 0.25-1.25 kg year^-1 of Hg are released from the bottom sediments to bulk water, while 0.61-0.97 kg remains confined in aquatic organisms, including 133 g in the phytobenthos, 2.6 g in the zooplankton, 420-781 g in the macrozoobenthos and 34 g in fish.

8

Sea salt emission from the coastal zone

Petelski T., Chomka M.

Oceanologia

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2000

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No. 42 (4)

399-409

EN

The paper presents the findings of experiments to determine marine aerosol emission from the coastal zone. A relation between aerosol flux and wave energy dissipation was found. The emission fluxes calculated for the distribution of aerosol concentration are proportional to the dissipation of wave energy to the power of 3/4. The calculations were carried out using the experimental data obtained during the TABEX and BAEX experiments.

9

Badania właściwości korozyjnych niezmywalnych topników o malej zawartości części stałych

Bukat K., Morawska Z., Sitek J.

Elektronika : konstrukcje, technologie, zastosowania

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1998

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Vol. 39, nr 10

16-9

PL

Topniki stosowane w procesach lutowania na fali spoiwa nie powinny wykazywać oddziaływania korozyjnego na złącza lutownicze. Szczególnie wymaganie to odnosi się do topników "no-clean", których pozostałości po lutowaniu nie są usuwane. Istnieje szereg metod badania korozyjności topników: korozja na miedzi, "lustro miedzi", zanieczyszczenia jonowe i rezystancja powierzchniowa izolacji. Autorzy artykułu przedstawiają wyniki badań korozyjności topników typu "low-solid", "no-clean".

EN

Fluxes applied in a wave soldering process should not cause corrosion of solder joints. Particularly this requirement refers to no-clean fluxes which residues do not required removal after soldering. There are several methods for investigation of flux corrosivenes: copper corrosion, copper mirror, ionic surface contamination and surface insulation resistance. The authors present the results of investigation of the corrosivity properties of no-clean, low-solid fluxes.