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Tytuł:
Effects of boron fertilization of spring cereals depending on application methods
Efektywnosc nawozenia zboz jarych borem w zaleznosci od sposobu aplikacji
Autorzy:
Wrobel, S
Powiązania:
https://bibliotekanauki.pl/articles/15532.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
cereal
plant cultivation
spring cereal
boron deficiency
boron fertilization
foliar application
soil fertilization
boron concentration
yield
Opis:
The study is a comparison of effects produced by boron fertilization applied to spring barley and oats, grown on light soil, low in available boron, in relation to the application method (pre-sowing, top dressing, foliar applications) and rates of the element. The study was carried out as a three-year series of one-year, two-factor strict field trials (the splitplot design). It has been demonstrated that top dressing with boron applied to soil at the tillering stage as well as foliar fertilization during the stem elongation stage can significantly improve yields. Grain of both cereals from the control plots showed symptoms of insufficient boron nutrition, which were absent when boron fertilization had been applied. Presowing fertilization, although not affecting the yields, improved the supply of grain with boron. Differences between the cereal species were found in terms of boron concentrations in vegetative organs of the cereals and in their response to higher availability of this nutrient. Compared to spring barley, oats was characterised by a much higher content of boron in vegetative parts and was more responsive to increased concentrations of boron in soil.
W badaniach porównywano efekty nawożenia borem jęczmienia jarego i owsa, uprawianych na glebie lekkiej o niskiej zawartości boru przyswajalnego, w zależności od sposobu stosowania (przedsiewnie, doglebowo pogłównie, dolistnie) oraz dawki. Badania przeprowadzono w jednorocznych dwuczynnikowych doświadczeniach polowych ścisłych (metodą split-plot), powtarzanych przez trzy lata. Wykazano istotne działanie plonotwórcze nawożenia doglebowego pogłównego borem, stosowanego w stadium krzewienia oraz dolistnego w stadium strzelania w źdźbło. Ziarno obu zbóż z obiektów kontrolnych wykazywało niedostateczne zaopatrzenie w ten składnik, które ulegało poprawie pod wpływem stosowania boru, w najwyższym stopniu – pogłównie doglebowo. Nawożenie przedsiewne nie wpływało na poziom plonowania, poprawiało jednak zaopatrzenie ziarna w badany mikroelement. Stwierdzono różnice międzygatunkowe w zawartości boru w częściach wegetatywnych zbóż oraz wrażliwość na zwiększoną dostępność tego składnika. Zawartość boru w częściach wskaźnikowych owsa była istotnie wyższa w porównaniu z jęczmieniem jarym i zwiększała się w większym stopniu wraz ze wzrostem tego składnika w glebie.
Źródło:
Journal of Elementology; 2009, 14, 2; 383-393
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wetting behavior of Si-13.5B alloy on polycrystalline h-BN-based substrates
Autorzy:
Polkowski, W.
Sobczak, N.
Nowak, R.
Kudyba, A.
Bruzda, G.
Polkowska, A.
Homa, M.
Turalska, P.
Shuleshova, O.
Kaban, I.
Powiązania:
https://bibliotekanauki.pl/articles/391820.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
silicon-boron alloys
hexagonal boron nitride
wettability
interfaces
AMADEUS Project
Opis:
In this work, for the first time the results of an experimental evaluation of the high temperature behavior of molten Si-B alloy in contact with refractory materials at temperatures up to 1750°C, under static argon atmosphere (p = 850– 900 mbar), is shown. The material investigated, having a nominal chemical composition of Si-13.5B (at. %), was fabricated by using the crucible-less electric arc-melting process assisted by the levitation drop method. The wettability of the molten alloy in contact with commercial hexagonal boron nitride (h-BN) substrates was evaluated by means of especially developed sessile drop technique combined with a contact heating procedure. It was found that both couples show a lack of wettability in the whole tested temperature range (the measured contact angle was θ > 130°). The more stable behavior in contact with molten Si-13.B alloy, evidenced by higher θ values and a lack of drop vibration during the high temperature exposition, was observed for the h-BN based composite substrate.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 321-326
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing the Surface Hardness of Cast Iron by Electrodeposition of Borides in Molten Salts
Autorzy:
Al-Azzawi, A. H.
Sytchev, J.
Baumli, P.
Powiązania:
https://bibliotekanauki.pl/articles/958199.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrodeposition
boron
cast iron
Opis:
In this paper the electrodeposition of boron on the surface of cast iron as a coating is applied to increase the hardness and protect the substrate against abrasive wear. The boron containing coating was synthesized by electrodeposition process from a NaCl-KCl (1:1 mol)-10 w%NaF-10w% KBF4 molten salt. The effect of electrolysis parameters (temperature and time) on the hardness is presented; the current density varied in the range –37 – –4.5 mA/cm2, allowing perfect coverage of and respect for dimensions. The electrochemical process was carried out at different temperatures (750°C-900°C) and for different periods of time (5-10 hours). Depending on the current density and duration of electrolysis, the deposits consist of FeB or Fe2B. Microhardness measurements across the boride layer indicated very high hardness values (between 1600 and 2100 HV0.05).The structure of the boride layer is linked to its boron content and thermal history: as-deposited coatings present very small grain sizes and can be considered as nearly amorphous.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1015-1018
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of spring wheat to foliar fertilization with boron under reduced boron availability
Reakcja pszenicy jarej na nawozenie dolistne borem w warunkch ograniczonej dostepnosci tego skladnika
Autorzy:
Wrobel, S
Powiązania:
https://bibliotekanauki.pl/articles/13628.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
plant cultivation
wheat
spring wheat
soil liming
drought
boron fertilization
boron content
yield
plant response
boron availability
foliar fertilization
Opis:
The study focused on the effects of foliar fertilization with boron applied to spring wheat grown on sandy soil, low in available boron, under the conditions of simulated drought stress and the soil pH modified by liming. The study involved pot trials set up in a greenhouse. Wagner’s pots, each containing 6 kg of light soil, served as experimental units. It was demonstrated that foliar application of boron was effective in mollifying the unfavourable wheat growth and nutrients uptake conditions (drought and soil reaction change). The fertilization alleviated the results of the limited availability of boron, significantly increasing the grain and straw yield mass and enriching the yields with boron. The highest rates of boron used for foliar application (7 and 9 cm3 0.3% H3BO3⋅pot-1) raised the concentration of this element in wheat grain up to a level comparable to the reference data.
W badaniach określano efekty nawożenia dolistnego borem pszenicy jarej uprawianej na glebie lekkiej o niskiej zawartości boru dostępnego, w warunkach symulacyjnego stresu suszy i zmiany odczynu gleby wskutek wapnowania. Badania przeprowadzono w doświadczeniach wazonowych, w hali wegetacyjnej. Jednostkę doświadczalną stanowiły wazony Wagnera mieszczące 6 kg gleby lekkiej. Wykazano skuteczność dolistnej aplikacji boru w łagodzeniu niesprzyjających warunków rozwoju pszenicy i pobierania składników (susza i zmiana odczynu gleby). Zastosowane nawożenie łagodziło skutki ograniczonej dostępności składnika, zwiększając istotnie masę plonów ziarna i słomy pszenicy jarej oraz wzbogacając je w bor. Najwyższe z zastosowanych w dolistnej aplikacji dawki boru (7 i 9 cm3 0,3% H3BO3⋅wazon-1) zwiększały zawartość tego składnika w ziarnie pszenicy do poziomu zbliżonego do porównawczego.
Źródło:
Journal of Elementology; 2009, 14, 2; 395-404
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combustion Characteristics and Mechanism of Boron-based, Fuel-rich Propellants with Agglomerated Boron Powder
Autorzy:
Xu, H. -X.
Pang, W.-Q.
Guo, H.-W.
Zhao, F.-Q.
Wang, Y.
Sun, Z.-H.
Powiązania:
https://bibliotekanauki.pl/articles/358733.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
analytical chemistry
boron-based fuel-rich solid propellants
agglomerated boron powder
combustion performance
combustion mechanism
Opis:
In order to extend the burning rate of boron-based, fuel-rich solid propellants with agglomerated boron powder, the effects of the boron content, the AP content, and of the magnesium powder content, on the burning rate and pressure exponent have been studied systematically. It has been shown that when the AP content is constant, the burning rate of the propellants increases with an increase in the agglomerated boron content. Furthermore, the burning rate and pressure exponent increase with increasing the contents of AP and magnesium powder. By means of single colour frame amplification photography and combustion wave tests, the combustion mechanism of these propellants has been investigated. It has been shown that the flame of the propellants becomes brighter by increasing the AP content, the dT/dxcp and dT/dxgp of the propellant FR-5 being around 6815 and 5789 °C/mm respectively, higher than those of FR-4, resulting in greater burning rates. The Ts of these propellants is above 683 °C, which is higher than the decomposition peak temperatures of agglomerated boron powder and of propellants (about 649 °C), which indicates that agglomerated boron powder is partially oxidized on the combustion surface, and the heat released from it may be beneficial to the combustion of the propellants.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 4; 575-587
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Boron Accompanied by Chromium, Vanadium and Titanium on the Transformation Temperatures of Low-Alloy Cast Steels
Autorzy:
Białobrzeska, Beata
Dziurka, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/2203729.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
boron
cast steels
dilatometric research
microstructure
Opis:
The purpose of the research was to examine the influence of boron on the selected properties of low-alloy cast steels. The chemical compositions of the cast steels were designed especially for this study to contain different alloy elements. The first composition lacked significant alloying elements. The subsequent grades of cast steels had the addition of chrome, chrome with vanadium, and chrome with titanium. It was decided to investigate the influence of boron in the presence of such alloying additives on the temperature of phase transformations. On the basis of dilatometric curves, the characteristic temperatures of the phase transformations were determined. Additionally, to assess the influence of the cooling rate on the structure of cast steels, an analysis of their microstructure, after full annealing and quenching, was carried out.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 257--267
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Optimum Concentration and Time Priming of Stevia Seed With Boric Acid (H3BO3) Micronutrient
Autorzy:
Shahverdi, Mehdi Aghighi
Omidi, Heshmat
Powiązania:
https://bibliotekanauki.pl/articles/2199705.pdf
Data publikacji:
2018-12-20
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
boron,
germination,
micronutrients,
nutripriming,
seed vigor
Opis:
In order to determine anoptimal duration and concentration of priming of stevia seed with boric acid for improvinggermination, an experimental factorial completely randomized design with three replications was conducted inthe laboratory of Seed Science and Technology, Shahed University of Tehran in 2015. The first factor was differentconcentrations of boric acid (zero, 0.5, 1, 1.5 and 2 percent) and the second factor of priming time (0, 8, 16, 24 and 32hours). Effects of concentration and duration of priming with Boric acid was significant on germination percentage,germination mean time, germination rate, germination energy, germination uniformity, germination mean daily,germination daily rate, germination value, seedling length and seed vigor index. The highest germination percentage,germination rate, germination energy, germination mean daily germination value and seed vigor index was 24 hourspriming and the highest germination percentage, germination rate, germination potential, germination value and seedvigor index in priming of 2% Boric acid were obtained. Germination uniformity highest in 24 hours at 1% concentrationpriming of boric acid (5.51). Seedling length in 24 hours at 1.5% concentration priming with boric acid washighest average 1.02 cm. Generally Stevia seed priming with boric acid for 24 hours at concentrations of 1.5 to 2percent had positive effects on germination indexes and seedling growth.
Źródło:
Plant Breeding and Seed Science; 2018, 78; 51-61
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological properties of surface layer with boron
Autorzy:
Lubas, J.
Powiązania:
https://bibliotekanauki.pl/articles/242091.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
wear
sliding friction
surface treatment
boron
Opis:
The aim of the present work is to determine the influence of technologically produced boron surface layers on the friction parameters in the sliding pairs under the conditions of mixed friction. The tribological evaluation included ion nitrided, pack borided, laser borided, quenched and tempered surface layers and TiB2 coating deposited on 38CrAlMo5-10, 46Cr2 and 30MnB4 steels. Modified surface layers of annular samples were matched under test conditions with counter-sample made from AlSn20 bearing alloy. Tested sliding pairs were lubricated 15 W/40 Lotos mineral engine oil. The tribological tests were conducted on a T-05 block on ring tester. The applied steel surface layer modification with boron allow creating surface layers with pre-determined tribological characteristics reąuired for the elements of kinematic pairs operating in the conditions of sliding friction. Pack boronizing reduces the friction coefficient during the start-up of the frictional pair and the maximum start-up resistance level is similar to the levels of pairs with nitrided surface layers. Paper present comparison between surface roughness of annular sample and countersample before and after test, influence of surface treatment annular sample on change of friction coefficient vs. rotation speed and load, influence of surface treatment annular sample on moment of friction in function load of kinematics pair, influence of surface treatment annular sample on friction forces and temperature depending on load, as well as influence of surface treatment annular sample on wear of AlSn20 bearing alloy under various load conditions.
Źródło:
Journal of KONES; 2009, 16, 3; 213-221
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of boron in animal health
Autorzy:
Kabu, M.
Uyarlar, C.
Zarczynska, K.
Milewska, W.
Sobiech, P.
Powiązania:
https://bibliotekanauki.pl/articles/961611.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
boron
enzyme
hormone
mineral
animal health
Opis:
Boron is a mineral used for various purposes in glass, ceramics, automotive and paint industries. Recently, boron has been confirmed to be an essential element for plants, animals and humans, although the knowledge of its biological effects is rather scanty. Boron is a dynamic trace element, and inorganic borates are transformed into boric acids and absorbed from mucosal surfaces, even when they are in low levels of physiological pH. It has been determined that boron affects many enzymes, bone development, mineralization, Ca, P, Mg and energy metabolism. Boron mineral compounds can be effective in optimizing the performance of an organism, treatment of bone structure disorders, reduction of cholesterol and triglyceride levels. Beside the effects it produces specifically on fat and lipid metabolisms, boron can influence the activity of vitamin D and affect some disorders connected with its deficiency. Although several studies on effects of boron on some mechanisms have been conducted over the last ten years, the available information remains insufficient.
Źródło:
Journal of Elementology; 2015, 20, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of boron fertilization on vigor, yielding and fruit quality of 'Jersey' highbush blueberry
Wpływ nawożenia borem na wzrost, plonowanie oraz jakość owoców borówki wysokiej odmiany Jersey
Autorzy:
Wójcik, P.
Powiązania:
https://bibliotekanauki.pl/articles/11364432.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
boron fertilization
Northern highbush blueberry
vigor
fruit quality
boron
plant cultivation
yielding
foliar application
soil application
Opis:
The aim of the study was to examine response of ‘Jersey’ highbush blueberry to boron (B) fertilization. The experiment was carried out in 2002-2003 at a private plantation in Central Poland on mature blueberries planted on a sandy loam soil with pH 4.1, low organic matter status, and medium available B content. Blueberries were supplied with B by foliar applications or broadcasting. Foliar B sprays were done in the spring or the fall. Spring B sprays were performed at the beginning of blooming, at petal fall, and 3 and 6 weeks after the ending of flowering. In each spring spray treatment, B was used at a rate of 0.2 kg ha⁻¹. Fall B spray was done 5 weeks after fruit harvest using 0.8 kg B ha⁻¹. Soil B was applied at the stage of bud break at a rate of 2 kg ha⁻¹. Blueberries unfertilized with B served as control. The results showed that soil B application and spring B sprays increased B status in flowers and leaves. However, B fertilization, regardless of application mode, had no effect on plant vigor, the number of flowers per cane, fruit set, mean fruit weight, berry firmness, and yielding. Berries of blueberries sprayed with B in the spring had increased soluble solids concentrations. It is concluded that: (i) B fertilizer requirements of ‘Jersey’ highbush blueberry are low, and (ii) at hot water extractable B concentration in a soil below 0.37 mg kg⁻¹ and/or at B status in leaves of current season shoots below 37 mg kg⁻¹, spring B sprays should be applied in blueberry culture to increase soluble solids concentration in fruit.
Celem pracy było zbadanie reakcji borówki wysokiej odmiany ‘Jersey’ na nawożenie borem. Doświadczenie przeprowadzono w latach 2002–2003 na borówkach posadzonych na glebie piaszczysto-gliniastej mającej pH 4,1, niską zawartość materii organicznej oraz średnią zawartość dostępnego boru. Rośliny zasilano borem w formie nawożenia doglebowego lub pozakorzeniowego. Opryskiwania borem wykonywano wiosną lub jesienią. Wiosenne opryski borem wykonywano na tych samych roślinach w fazie początku kwitnienia, w czasie opadania płatków kwiatowych oraz 3 i 6 tygodni po kwitnieniu. W każdym wiosennym oprysku użyto 0,2 kg B·ha⁻¹. Jesienny oprysk borem wykonano 5 tygodni po zbiorze owoców w dawce 0,8 kg B·ha⁻¹. Nawożenie doglebowe zastosowano w fazie pękania pąków w dawce 2 kg·ha⁻¹. Rośliny nietraktowane borem stanowiły kontrolę. Wyniki wykazały, że doglebowe nawożenie borem oraz wiosenne opryski tym składnikiem zwiększyły zawartość boru w kwiatach i liściach. Jednakże nawożenie borem, niezależnie od sposobu zastosowania, nie miało wpływu na siłę i charakter wzrostu, liczbę kwiatów na pędzie, zawiązywanie owoców, średnią masę owocu, jędrność owoców oraz plonowanie. Owoce roślin opryskiwanych wiosną borem miały podwyższoną zawartość ekstraktu refraktometrycznego. Wnioskuje się, że: (1) potrzeby nawozowe borówki wysokiej odmiany ‘Jersey’ w odniesieniu do boru są niskie, oraz (2) przy zawartości boru w glebie poniżej 0,37 mg·kg⁻¹ i/lub przy poziomie boru w liściach poniżej 37 mg·kg⁻¹, wskazane jest wiosenne opryskiwanie borówki wysokiej borem w celu zwiększenia zawartości ekstraktu w owocach.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2004, 03, 2; 123-129
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ammonium Dodecahydrododecaborate (NH4)2[B12H12]: Hydrogen and Boron Rich Fuel for Jet Propulsion Engines
Autorzy:
Jadhav, Pandurang M.
Patil, Jay
Prasanth, Hima
Rao, Gururaja
Powiązania:
https://bibliotekanauki.pl/articles/27788219.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
jet propulsion
boranes
boron
combustion
specific impulse
Opis:
There is dire need for the exploration of boron (B) substitution in jet propulsion engines for improving their combustion characteristics. In this regard, ammonium dodecahydrododecaborate (NH4)2[B12H12] has been synthesized, characterized and evaluated for its propulsion characteristics. This hydrogen and boron-rich entity was found to be a potential candidate for future applications in propulsion technology.
Źródło:
Central European Journal of Energetic Materials; 2022, 19, 2; 158--167
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Al contacts to Si surface exposed in the course of plasma etching of previously grown nanocrystalline c-BN film
Autorzy:
Firek, P.
Werbowy, A.
Szmidt, J.
Olszyna, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/308834.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cubic boron nitride
plasma etching
electric contacts
Opis:
Properties of Al electric contacts to Si(p) surface exposed to fluorine-based plasma etching of nanocrystalline cubic boron nitride (c-BN) film grown previously were studied and compared to the properties of Al contacts fabricated on pristine or dry etched surface of Si(p) wafers. In addition, a part of the investigated samples was annealed in nitrogen atmosphere at the temperature of 673 K. Analysis of contract properties is based on current-voltage (I-V) measurements of the produced Al-Si structures. The presented investigations were performed in order to evaluate the efficiency of the applied plasma etching method of nanocrystalline c-BN from the viewpoint of its influence on the properties of metal contacts formed subsequently and thus on the performance of electronic devices involving the use of boron nitride.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 1; 76-80
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of colemanite from tailing using a knelson concentrator
Autorzy:
Savas, M.
Powiązania:
https://bibliotekanauki.pl/articles/109624.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Knelson concentrator
boron wastes
enrichment process
environment
Opis:
Tailing from colemanite concentrators in Emet Boron Works contains significant amounts of boron and cause potential environmental problems. Therefore, the recovery of colemanite from these tailings is imperative to ensure no pollution of the environment. In addition, the tailings also have economic importance as a secondary resource due to their high content of B2O3. This study was undertaken to investigate the possibility of recovering colemanite from tailings using a Knelson concentrator. After samples in size of -1 mm and 0.5 mm were obtained from tailings (-3 mm) by comminution, these three different samples were placed into a Knelson concentrator. In addition to particle size, the effects of fluidization water velocity and bowl speed on the performance of the enrichment process were examined. A concentrate with a B2O3 content of 34.2% was produced with a recovery of 78.3% from tailings with a B2O3 content of 24.8%. Increasing the bowl speed improved the B2O3 recovery. Increasing the fluidization velocity or reducing the particle size adversely affected the recovery percentage. The enrichment process also permitted the removal of any residual As and Fe.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 1036-1047
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser cladding by tru laser cell of SSAB BORON B27 STEEL applied in agriculture
Napawanie laserem tru laser cell stali SSAB BORON B27 stosowanej w rolnictwie
Autorzy:
Kapcińska-Popowska, D.
Gościański, M.
Piasecki, M.
Kamiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/334882.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
laser cladding
microstructure
microhardness
SSAB BORON B27 steel
napawanie laserowe
mikrostruktura
mikrotwardość
stal SSAB BORON B27
Opis:
The article presents the effect of conventional heat treatment applied after overlaying welding with laser on properties of SSAB BORON B27 STEEL used in agriculture. In order to select the optimum parameters of laser processing and heat treatment for the best tribological properties of strength microhardness tests were carried out as well as observation of microstructures.
W artykule przedstawiono wpływ konwencjonalnej obróbki cieplnej zastosowanej po napawaniu laserowym na właściwości stali SSAB BORON B27 stosowanej w rolnictwie. W celu wytypowania optymalnych parametrów obróbki laserowej i cieplnej dla uzyskania najlepszych właściwości tribologicznych i wytrzymałościowych przeprowadzono badania mikrotwardości oraz obserwację mikrostruktur.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2017, 62, 1; 74-77
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cutting Mechanics when Turning Powder Metallurgy Produced Nickel-Cobalt Base Alloy with a Cubic Boron Nitride Insert
Autorzy:
Daź, Waldemar
Habrat, Witold
Tymczyszyn, Jarosław
Krupa, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2201808.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
tool wear
cutting forces
surface roughness
nickel-cobalt alloys
residual stress
cubic Boron Nitride
cubic Boron Nitride tool
Opis:
For the critical aero-engine parts it’s important to understand influence of cutting tools, cutting parameters, tool ware etc. on near surface condition which highly affect fatigue strength and at the same part life-time. New material implemented for the latest designs of aero-engines parts generate challenges for machining processes to fulfil strict requirements of aviation standards. Finish machining is the most important stage of process influencing fatigue strength. cBN tool are often used for final stage of machining. The objective of this study was analysis of cutting mechanics during finish turning of modern nickel-cobalt based alloy with cBN insert. Observations of cutting tool wear and cutting parameters influence on the components of cutting force, surface roughness and residual stress are presented in this paper.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 4; 163--175
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł

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