Autor: Walkowiak, W. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On the kinetics of Zn(II) and Cd(II) ions flotation with proton ionizable lariat ethers
Autorzy:: Ulewicz, M.
Walkowiak, W.
Powiązania:: https://bibliotekanauki.pl/articles/347072.pdf
Data publikacji:: 2004
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Źródło:: Ars Separatoria Acta; 2004, 3; 89-97
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Evaluation of susceptibility of phytopathogenic fusarium culmorum strain on selected essential oils
Ocena wrażliwości fitopatogennego szczepu Fusarium culmorum na wybrane olejki eteryczne
Autorzy:: Krzyśko-Łupicka, T.
Walkowiak, W.
Powiązania:: https://bibliotekanauki.pl/articles/389303.pdf
Data publikacji:: 2014
Wydawca:: Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:: Fusarium culmorum
thyme oil
lemongrass oil
Litsea cubeba oil
cajeput oil
tea tree oil
verbena oil
grapefruit oil
antifungal activity
olejek tymiankowy
olejek lemongrasowy
olejek Litsea cubeba
olejek kajeputowy
olejek z drzewa herbacianego
olejek verbenowy
olejek grejpfrutowy
antyfungistatyczna aktywność
Opis:: The prevalence in environment, high pathogenicity, toxigenicity and acquisition of resistance to used fungicides by Fusarium culmorum leads to a search for alternative methods to combat them. The solution to this problem may be essential oils. The aim of the study was to evaluate the sensitivity of the phytopathogenic Fusarium culmorum 187 (Mart.) Sacc. strain on selected essential oils such as thyme, lemongrass, Litsea cubeba, cajeput, tea tree, verbena and grapefruit in comparison to Funaben T seed preparation. The research material was a species of Fusarium culmorum 187 (Mart.) Sacc., isolated from infected cereals. The tested essential oils such as thyme, lemongrass, Litsea cubeba, cajeput, tea tree, verbena and grapefruit oils were introduced into the substrate at concentrations of 0.025; 0.05; 0.125; 0.25; 0.5; 1.00, 2.0 %, while Funaben T at concentrations of 0.125; 0.25; 0.5 %. The control was the development of the fungus in a medium free from these substances. Biotic activity of essential oils in reducing the linear growth of F. culmorum 187 (Mart.) Sacc. was assessed using the method of poisoned substrates. The activity of oils in reducing the linear growth of mycelium was evaluated by measuring the growth of fungal colonies (growth rate index) while the fungistatic activity was evaluated on the basis of the percentage growth inhibition of fungal colony calculated according to Abbott’s formula. The susceptibility of Fusarium culmorum 187 strain was differentiated and depended on the type and concentration of tested oils. Thyme oil at all concentrations tested (0.025–2.0 %) completely inhibited the growth of mycelia while other oils caused a total inhibition of growth at concentrations of 0.5–2.0 %. The effect of essential oils was similar to that of Funaben T preparation.
Rozpowszechnienie w środowisku, wysoka patogenność i toksynotwórczość oraz nabywanie oporności na stosowane fungicydy przez grzyby Fusarium culmorum prowadzi do poszukiwania alternatywnych metod ich zwalczania. Rozwiązanie problemu mogą stanowić olejki eteryczne. Celem pracy była ocena wrażliwości fitopatogennego szczepu Fusarium culmorum 187 na wybrane olejki eteryczne, takie jak: tymiankowy, z trawy cytrynowej, z Litsea cubeba, kajeputowy, z drzewa herbacianego, werbenowy i grejpfrutowy w porównaniu do zaprawy nasiennej Funaben T. Materiał badawczy stanowił gatunek grzyba Fusarium culmorum 187 (Mart) Sacc., wyizolowany z porażonych zbóż. Testowane olejki eteryczne, takie jak: tymiankowy z trawy cytrynowej, z Litsea cubeba, kajeputowy, z drzewa herbacianego, werbenowy i grejpfrutowy, wprowadzano do podłoża w stężeniach: 0.025; 0.05; 0.125; 0.25; 0.5; 1.00; 2.0 %. Natomiast Funaben T w stężeniach; 0.125; 0.25; 0.5. Kontrolę stanowił rozwój grzyba w podłożu wolnym od tych substancji. Aktywność biotyczną olejków w ograniczaniu wzrostu liniowego grzyba F. culmorum 187 Mart.(Sacc.) oceniano metodą zatrutych podłoży. Aktywność olejków w ograniczaniu wzrostu liniowego grzybni oceniano na podstawie pomiarów przyrostu kolonii grzybów (indeks tempa wzrostu), a fungistatyczną – na podstawie procentu zahamowania wzrostu kolonii grzyba obliczonego zgodnie ze wzorem Abbotta. Evaluation of Susceptibility of Phytopathogenic Fusarium culmorum 365 Wrażliwość szczepu Fusarium culmorum 187 była zróżnicowana i zależała od rodzaju i zastosowanego stężenia testowanych olejków. Olejek tymiankowy we wszystkich badanych stężeniach (0.025–2.0 %) całkowicie hamował rozwój grzybni, a pozostałe olejki całkowite zahamowanie wzrostu wywoływały w stężeniach 0.5–2.0 %. Efekt działania olejków eterycznych był zbliżony do działania zaprawy Funaben T
Źródło:: Ecological Chemistry and Engineering. A; 2014, 21, 3; 355-366
1898-6188
2084-4530
Pojawia się w:: Ecological Chemistry and Engineering. A
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Selective removal of Cu(II), Co(II), Zn(II), and Ni(II) with ionizable dibenzo-16-crown-5 and dibenzo-19-crown-6 lariat ethers as ion carriers in polymer inclusion membrane transport
Autorzy:: Kozłowski, C. A.
Walkowiak, W.
Powiązania:: https://bibliotekanauki.pl/articles/346931.pdf
Data publikacji:: 2007
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: polymer inclusion membrane
competitive transport
copper(II)
cobalt(II)
zinc(II)
nickel(II)
enthalpy of formation
Derivatives of dibenzo-16-crown-5 and dibenzo-19-crown-6
Opis:: A selective removal of transition metal cations, i.e. Cu(II), Co(II), Zn(II), and Ni(II), with ionizable dibenzo-16-crown-5 and dibenzo-19-crown-6 lariat ethers as ionic carriers in transport across polymer inclusion membrane has been presented. The competitive transport from aqueous nitrate solutions containing metal ions at concentrations of 0.0010 M at pH 4.0 and 7.0 through the cellulose triacetate membrane with 0.5 M lariat ether 1 and 2 (based on a plasticizer) as the ion carrier and o-nitrophenyl pentyl ether (ONPPE) as the plasticizer into 0.5 M hydrochloric solution was performed. For pH = 4.0 and 7.0 of source aqueous phases the selectivity orders were as follows: Cu(II) > Co(II) > Zn(II) > Ni(II), and Cu(II) > Zn(II), Ni(II), Co(II), respectively. The semi-empirical equation was used for calculations of enthalpy formation for complexes of lariat ethers studied with transition metal cations. The two possibilities of metal cation-lariat ether coordination were assumed, i.e. via the crown ether cavity or ionizable carboxylic group. We found that for the both lariat ethers studied at pH 4.0 of source phase the transport rate linearly decreases with the enthalpy of formation increase. This correlation confirms that the observed behavior is connected with the stability of complexes formed by interaction of the lariat ether ring and the transition metal cations studied.
Źródło:: Ars Separatoria Acta; 2007, 5; 19-26
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: The effect of Pt active coating application inside diesel engine on polycyclic aromatic hydrocarbons (PAHS) emission
Autorzy:: Janicka, A
Walkowiak, W.
Szczepaniak, W.
Powiązania:: https://bibliotekanauki.pl/articles/244056.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: active coating
catalyst
polycyclic aromatic hydrocarbons
diesel engine
Opis:: Application of active coating inside of an self-ignition engine may have an important impact on several stages of combustion process: fuel cracking, fore-flame phase, combustion phase and secondary combustion phase [7]. Investigations of such construction are very rare in the literature - especially of hydrocarbons emission. Polycyclic aromatic hydrocarbons (PAHs) are known to have mutagenic and carcinogenic effect on humans [2, 6, 7]. One of the most important anthropogenic sources of these substances is motorization (especially diesel engines). The paper presents results of measurements of PAHs emissions from SB3.1 self-ignition engine with Pt active coating application inside. The catalyst was applied on engine valves surface. Zirconium ceramic was chosen as a coating for catalyst application (also because of its thermo-insulating properties). Because of unstable parameters of self-ignition engine work (pressure and temperature jumps), PAHs were extracted from two phases: gas phase and solid phase (particle matter - PM). A chromatographic method of PAHs identification and analysis, because of their low level of concentration in exhaust gases, needed to be supported by sample purification and enrichment stages [40]. It has been found that a significant decrease of total toxic polycyclic aromatic hydrocarbons concentration in engine exhaust gases for engine with Pt catalyst application. The catalyst application causes also changes in relative concentrations of polycyclic aromatic hydrocarbons.
Źródło:: Journal of KONES; 2008, 15, 2; 131-136
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Inert catalyst in compression ignition engine-VOCs emission
Autorzy:: Janicka, A.
Walkowiak, W.
Szczepaniak, W.
Powiązania:: https://bibliotekanauki.pl/articles/244311.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
inert catalyst
VOCs
compression ignition engine emission
Opis:: The volatile organic compounds (VOC's) are significant group o air pollution emitted during fuel combustion in diesel engines. This research work is continuation of research where the influence of an inert catalyst on toxic emission from a self-ignition engine has been investigated. In particular volatile organic compounds VOC's emissions which are known to have mutagenic and carcinogenic properties, have been studied. The experimental results show that implementation of catalytic coating on chosen elements of diesel engine causes change of percentage participation of particular compounds in their sum and decrease of their concentration. The analysis of chosen compounds (benzene and formaldehyde) shows that the modification which was proposed causes increase of concentration of those substances when engine works in specific conditions, what is connected with change of engine exhaust toxicity and decrease in PAHs concentration, what is connected with toxicity decrease in exhaust gases. In particularly research work stand, the comparison of total VOC's concentration with and without catalytic coating, the comparison of benzene concentration, the comparison of formaldehyde concentration, the comparison of toxicity level with and without catalytic coating are presented in the paper.
Źródło:: Journal of KONES; 2007, 14, 4; 127-131
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: Principles and applications of solvent sublation - a review
Autorzy:: Sobianowska, K.
Walkowiak, W.
Kozłowski, C.
Powiązania:: https://bibliotekanauki.pl/articles/346991.pdf
Data publikacji:: 2010
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: solvent sublation
ion flotation
adsorptive bubble separations
metal ions
organic compounds
Opis:: This article reviews more than 50 references covering the solvent sublation as one of the adsorptive bubble separation methods for organic and inorganic coumpounds removal from aqueous solutions, which were published last 50 years. The solvent sublation is very simple, effective and fast process for removal and separation of chemical compounds from dilute aqueous solutions and can be treated as preconcentration method in their analytical determination. This review concerns the fundamentals of solvent sublation process and desribes the factors determinating the process (temperature, composition of initial aqueous solution, pH, ionic strength, surfactants and ligands presence, organic solvent presence with additives and gas bubble generation). The examples of metal ions selective removal (Table 1) and organic coupounds removal (Table 2) are shown.
Źródło:: Ars Separatoria Acta; 2009-2010, 7; 23-38
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 7.

Tytuł:: Zinc(II) selective removal from other transition metal ions by solvent extraction and transport through polymer inclusion membranes with D2EHPA
Autorzy:: Ulewicz, M.
Walkowiak, W.
Pośpiech, B.
Powiązania:: https://bibliotekanauki.pl/articles/346997.pdf
Data publikacji:: 2003
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: polymer inclusion membrane
solvent extraction
zinc(II)
cobalt(II)
nickel(II)
copper(II)
cadmium(II)
Opis:: An experimental investigation concerns zinc(II), cobalt(II), nickel(II), copper(II) and cadmium(II) ions separation from aqueous chloride solutions by solvent extraction and transport through polymer inclusion membrane (PIM) processes. The selective transport of metal ions from the aqueous chloride source phase through PIM containing cellulose triacetate (support), o-nitrophenyl pentyl ether (plasticizer) and di(2-ethylhexyl)phosphoric acid (ion carrier) is shown. Zn(II) can be effectively removed from dilute aqueous chloride solutions by its transport through PIMs with di(2-ethylhexyl)phosphoric acid as the ionic carriers into 1.0 M HCl as the receiving phase. The transport selectivity of Zn(II) over Co(II), Ni(II), Cu(II) and Cd(II) decreases while the pH of the solution increases in the source phase. Also, by solvent extraction, Zn(II) can be selectively removed from dilute aqueous chloride solutions.
Źródło:: Ars Separatoria Acta; 2003, 2; 47-55
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 8.

Tytuł:: The effect of Pt internal catalyst on relative carcinogenic coefficient (RCC) of polycyclic aromatic hydrocarbons (PAHs) emitted from diesel engine
Autorzy:: Janicka, A.
Walkowiak, W.
Szczepaniak, W.
Powiązania:: https://bibliotekanauki.pl/articles/247594.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: internal catalyst
polycyclic aromatic hydrocarbons
relative carcinogenic coefficient
diesel engine
Opis:: One of the main anthropogenic sources of PAHs emission is motorization, especially compression ignition engines. The researches of International Agency for Research on Cancer (IARC) proved that some compounds from polycyclic aromatic hydrocarbons group are toxic for live organisms and cause damages of adrenal glands, lymphatic, circulation and respiratory systems. Because of carcinogenic properties and common occurrence in human environment benzo(a)pirene has been accepted as polycyclic aromatic hydrocarbons indicator. In relation to benzo(a)pirene, Nisbet and LaGoy determined relative carcinogenic coefficients (RCC) for individual polycyclic aromatic hydrocarbons. The paper presents results of analysis of PAHs RCC emitted from SB3.1 self-ignition engine with Pt active coating application inside. The catalyst was applied on engine valves surface. Zirconium ceramic was chosen as a coating for catalyst application (also because of its thermo-isolating properties). Because of unstable parameters of self-ignition engine work (pressure and temperature jumps), PAHs were extracted from two phases: gas phase and solid phase (particle matter - PM). A chromatographic method of polycyclic aromatic hydrocarbons identification and analysis, because of their low level of concentration in exhaust gases, needed to be supported by sample purification and enrichment stages. It has been found that implementation of catalytic coating on valves of the engine causes decrease of polycyclic aromatic hydrocarbons concentration in exhaust gases, what results in decrease (in most cases) of the sum of relative carcinogenic coefficient of polycyclic aromatic hydrocarbons.
Źródło:: Journal of KONES; 2008, 15, 3; 209-213
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 9.

Tytuł:: Inert catalyst in compersion ignition engine - pahs emission
Autorzy:: Janicka, A.
Walkowiak, W.
Szczepaniak, W.
Powiązania:: https://bibliotekanauki.pl/articles/243393.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: inert catalyst
PAHs
compression ignition engine emission
Opis:: In this research work the influence of an inert catalyst on toxic emission from a self-ignition engine has been investigated. In particular polycyclic aromatic hydrocarbons (pahs) emissions, which are known to have mutagenic and carcinogenic properties, have been studied. The experimental results show that implementation of catalytic coating on chosen elements of diesel engine causes decrease in pahs concentration, what is connected with toxicity decrease in exhaust gases. The inert catalyst application (active coating on research engine glow plugs) is very advantageous for decrease of total polycyclic aromatic hydrocarbons (pahs) concentration in engine exhaust gases, especially on idle running. The applied modification of engine combustion space causes significant decrease of exhaust toxicity. Because of high effectiveness in pahs concentration and toxicity decrease it is recommended to continue the researches and extend them by various physical-chemical modifications of catalytic layers. The paper research work stand containing engine test house, engine with a break, fuel reservoir, NO, CO and smoke level analyzers, filter, tube with active coal, exhaust gases uptake system and engine control system. The pahs concentration marked in idle running diesel engine in two states of engine work, pahs concentration marked in diesel engine and the total pahs concentration in engine exhaust gases and pahs toxicity in engine exhaust gases for two engine loads are presented in the paper.
Źródło:: Journal of KONES; 2007, 14, 3; 227-232
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 10.

Tytuł:: Application of D2EHPA for manganese(II) and nickel(II) separation by solvent extraction and polymer inclusion membranes
Autorzy:: Pośpiech, B.
Walkowiak, W.
Ulewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/347057.pdf
Data publikacji:: 2004
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: manganese(II)
nickel(II)
D2EHPA
solvent extraction
polymer inclusion membrane
Opis:: The separation of manganese(II) and nickel(II) from chloride solution with di-(2-ethylhexyl) phosphoric acid (D2EHPA) was studied. The metal ions were separated using solvent extraction and transport through polymer inclusion membranes (PIMs) with D2EHPA as the extractant/ion carrier. The aqueous solutions consisted of 0.010 M manganese(II) and nickel(II) chlorides. The influence of aqueous phase pH on the separation of Mn(II) and Ni(II) has been investigated. Mn(II) can be selectively removed from chloride solution at equilibrium pH equal to 2.90. From the organic phase, Mn(II) was stripped with 0.1-2.0 M aqueous solutions of HCl, H2SO4 and HNO3. The competitive transport of Mn(II) and Ni(II) through PIMs was studied as a function of the ion carrier and plasticizer concentration in the membrane.
Źródło:: Ars Separatoria Acta; 2004, 3; 72-80
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 11.

Tytuł:: Method of analysis of measurement result cohesion with the theory of mathematical record using and concentrations analysis
Metoda analizy spójności wyników pomiarów z wykorzystaniem teorii ewidencji matematycznej i analizy skupień
Autorzy:: Topolska, K.
Walkowiak, W.
Topolski, M.
Powiązania:: https://bibliotekanauki.pl/articles/243097.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modelowanie
trwałość
Dempster- Shafer
statystyka
modelling
durability
Dempster-Shafer theory
Statistica
Opis:: This study presents method of selection the most coherent, repeatable in time, results of researches. Firstly, a possible of application of concentration analysis for detection of variable or dependent variable, which results are different from other variables, is presented. Because some results of the same variable in time periods could influence on increase of results standard error, for such points detection, measure using mathematic filing system theory, Spearman's correlation ordinal ranks and weight of information contradiction, in sense of Dampster-Shafer theory, are proposed. The obtained measure cause decrease of results standard errors by selection and removal of measure points which influence on validity scales decrease. Example-results of the measurement, the analysis of concentrations for variable Y1, Y2, Y3 and Y4, results of the normalization for each result of measurements, average values of measurement for all received results BZ and for selected MODELS, results of measurement marked curves of average data for all BZ measurements and measurement selected of MODEL least standard-errors are presented in the paper.
W artykule zastała przedstawiona metoda doboru najbardziej spójnych wyników pomiarów powtarzanych w czasie. W pierwszej części zaprezentowano możliwość zastosowania analizy skupień do wykrycia zmiennej bądź zmiennych zależnych, których wyniki różnią się od pozostałych zmiennych. Ponieważ niektóre wyniki pomiarów tej samej zmiennej w odstępach czasu mogą wpływać na zwiększanie błędu standardowego wyników, więc w celu wykrycia takich punktów zaproponowano miarę wykorzystującą teorię ewidencji matematycznej, korelację rang porządkowych Spearmana i wagę sprzeczności informacji w sensie teorii Dempstera-Shafera. Uzyskana miara pozwoliła na obniżenie błędów standardowych pomiarów, przez wyselekcjonowanie i usunięcie punktów pomiarowych, które wpływają na zmniejszenie rzetelności skal. W szczególności w artykule przedstawiono przykładowe wyniki pomiaru, analiza skupień dla zmiennych Y1, Y2, Y3 i Y4, wyniki normalizacji dla poszczególnych wyników pomiarów, uśrednione wartości pomiarów dla wszystkich otrzymanych wyników BZ i dla wyselekcjonowanych MODELI, wyniki pomiarów wraz z naniesionymi krzywymi uśrednienia danych dla wszystkich pomiarów BZ i pomiarów wyselekcjonowanych o najmniejszych błędach standardowych MODELI.
Źródło:: Journal of KONES; 2007, 14, 2; 521-528
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 12.

Tytuł:: Lead(II) removal from aqueous solutions by solvent extraction with tetracarboxylresorcin[4]arene
Autorzy:: Konczyk, J.
Kozlowski, C.
Walkowiak, W.
Powiązania:: https://bibliotekanauki.pl/articles/110670.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: solvent extraction
lead(II)
zinc(II)
cadmium(II)
resorcinarene
Opis:: A novel tetracarboxylresorcin[4]arene was synthesized and its selective complexing ability towards Pb(II) ions was examined. The influence of several parameters such as pH of aqueous phase, agitation time, extractant and modifier concentrations on solvent extraction of Pb(II) ions from the aque-ous nitrate phase into chloroform organic phase was studied. The stoichiometry of the formed metal-ligand complexes was established by slope analysis. Pb(II) ions were quantitatively extracted in the form of 2:1 Pb(II)-resorcin[4]arene complex from aqueous solutions of pH 5.5 to the solution of ligand in chloroform. Competitive solvent extraction experiments in the presence of Zn(II) and Cd(II) ions were also carried out and high selectivity of the extractant towards Pb(II) over Zn(II) and Cd(II) was found. The selectivity order was: Pb(II) >> Cd(II) > Zn(II).
Źródło:: Physicochemical Problems of Mineral Processing; 2013, 49, 1; 213-222
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 13.

Tytuł:: Application of macrocycle compounds for metal ions separation and removal - a review
Autorzy:: Walkowiak, W.
Ulewicz, M.
Kozłowski, C. A.
Powiązania:: https://bibliotekanauki.pl/articles/346971.pdf
Data publikacji:: 2002
Wydawca:: Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:: macrocycles
crown ethers
lariat ethers
metal ions
separation
Opis:: A review is presented on macrocyclic compounds novel reagents for metal ions separation and removal in solvent extraction, transport through liquid membranes, and flotation processes. As macrocyclic compounds were used such chemicals as non-ionizable crown ethers, ionizable crown ethers (lariat ethers), calixarenes, and acyclic polyethers. Many literature data as well our own recent research data will be reported on metal ions removal and separation.
Źródło:: Ars Separatoria Acta; 2002, 1; 87-98
1731-6340
Pojawia się w:: Ars Separatoria Acta
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 14.

Tytuł:: A modified method for the determination of radioactive isotopes in building raw and construction materials with multichannel gamma spectrometry
Autorzy:: Charewicz, W.
Żebrowski, A.
Walkowiak, W.
Borek, B.
Powiązania:: https://bibliotekanauki.pl/articles/147083.pdf
Data publikacji:: 2000
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: building materials
multichannel gamma-ray spectrometry
radioactive isotopes
Opis:: A modified method is presented for the determination of natural and artificial isotopes in building raws and materials using multichannel gamma-ray spectrometry. A procedure is given for the preparation of standards as well as for the determination of radioisotopes content in typical building raws and/or materials. Results of these determinations were compared with those from standard, tri-channel gamma spectrometry described in Instruction No. 234/95 [2] issued by the Institute of Building Technology in Warsaw, Poland.
Źródło:: Nukleonika; 2000, 45, 4; 243-247
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 15.

Tytuł:: Proton - ionnizable lariat ethers - new generation of collectors in ion flotation process
Jonizowane etery lariatowe - nowa generacja kolektorów w procesie flotacji jonowej
Autorzy:: Maciejewski, P.
Robak, W.
Ulewicz, M.
Walkowiak, W.
Powiązania:: https://bibliotekanauki.pl/articles/348349.pdf
Data publikacji:: 2007
Wydawca:: Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:: flotacja jonowa
cez(I)
stront(II)
bar(II)
ołów(II)
etery lariatowe
Opis:: Autorzy artykułu przedstawili badania selektywnego wydzielania wybranych kationów metali z rozcieńczonych roztworów wodnych z użyciem nowej grupy związków makrocyklicznych, tj. jonizowanych eterów lariatowych w obecności spieniacza niejonowego.
Źródło:: Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2007, 3; 108-127
1731-8157
Pojawia się w:: Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 16.

Tytuł:: Heat release in spark ignition engine with internal catalyst
Autorzy:: Andrych-Zalewska, M.
Walkowiak, W. W.
Kolanek, C.
Powiązania:: https://bibliotekanauki.pl/articles/245329.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: heat release
catalyst
spark ignition
pressure
Opis:: In the present work there have been shown the results of initial researches concerning heat release process in the spark ignition engine with inner catalyst. There has been presented the calculative model of heat release process and calculative methodology leading to obtaining temperature course, combustion function and its derivative because of measured course of combustion pressure. The pressure courses, which are necessary for calculations, were obtained on the measure seat with AD 1600 engine that is load with eddy- current brake. The engine was equipped with spark plug with miniature pressure sensor f-my Kistler, and the courses of pressure were recorded by the use of f-my Smetec apparatus. The courses of heat release process were analysed in rotations of n=1500 rotations/min and n=3000 rotations/minute and load of 50 Nm and 70 Nm. The analysis was made comparatively for the system with the catalyst and without catalyst. In the work there have been presented the results of experimental and model researches which aim was the analysis of the issue of influencing the catalytic active surfaces placed in the spark ignition engine combustion space. Those surfaces, catalysing the process of creating combustible mixture and its combustion, influence the combustion process course and, simultaneously, have impact on the engine work parameters and the heat release course.
Źródło:: Journal of KONES; 2015, 22, 4; 7-14
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 17.

Tytuł:: The effect of waterin emulsion fuel on nitric oxides concentration in diesel engine exhausts
Wpływ dodatku wody w paliwie emulsyjnym na stężenie tlenków azotu w spalinach silnika o zapłonie samoczynnym
Autorzy:: Kolanek, Cz.
Kułażyński, M.
Sroka, Z.
Walkowiak, W.
Powiązania:: https://bibliotekanauki.pl/articles/245674.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silnik spalinowy
paliwo
emulsja wodna
tlenki
combustion engines
fuel
water-emulsion
nitric oxides
Opis:: Nitric oxides (NO) concentration in exhaust gases of self-ignition engine is a result of air usage for hydrocarbon fuel compounds oxidation in combustion process. The methods of limitation of NOx concentration based on adjusting optimization of injection advance angle and they are responsible for aim conflict in exhaust smokiness sphere. The progressive expectation of European Union, defined by Euro V and still discussable Euro VI implementation, caused a necessary of reaching for solutions apart from an engine like exhaust gas recirculation (EGR), selective catalytic reduction (SCR) and diesel particle filters - DPF. The method of water addition (especially the most effective - in water-fuel emulsion form) to combustion process has been known since years. This paper presents the results of the researches which aim was to investigate nitric oxides concentration in exhausts of one-cylinder self-ignition engine (typeS301D)fueled l0%, 20%, 30% water-emulsion fuel. Using of emulsion cut down emission nitric oxides (NOx), carbon monoxide and smoking of an engine with relation to fuelled with diesel oil. Using of the fuel containing 20% H2O cut down emission NO approx. 61%, emission NOx approx.67%, carbon monoxide approx. 20% with relation to fuelled with diesel oil.
W pracy przedstawiono wyniki badań wpływu zasilania silnika o zapłonie samoczynnym (typu S301D) paliwem emulsyjnym, zawierającym 10, 20 i 30% wody. Obserwowano stężenia tlenku azotu i tlenków azotu, tlenku węgla oraz dymienie silnika. W celu porównania efektów wyznaczono emisje jednostkowe poszczególnych wielkości i odniesiono je do takich wielkości wyznaczonych dla handlowego oleju napędowego. W przypadku NOx i CO zaobserwowano ekstremum efektu dla zawartości 20% wody; w przypadku dymienia silnika maksymalny efekt odpowiada maksymalnemu udziałowi wody w paliwie. Użycie paliwa emulsyjnego obniża emisję tlenków azotu (NO), tlenku węgla (CO) i dymienie silnika (S) w stosunku do zasilania olejem napędowym. W obszarze tlenku azotu (NO) użycie paliwa zawierającego 20% H2O spowodowało obniżenie emisji NO do poziomu 61% w stosunku do zasilania olejem napędowym. W obszarze tlenku węgla (CO) użycie paliwa zawierającego 20% H2O obniża emisję do poziomu 20% w stosunku do zasilania silnika olejem napędowym W obszarze tlenków azotu (NO) użycie paliwa zawierającego 20% H2O obniżyło emisję NOx do poziomu 67% w stosunku do zasilania olejem napędowym.
Źródło:: Journal of KONES; 2009, 16, 4; 227-232
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 18.

Tytuł:: The impact of active ceramic coating implementation on gasoline engine exhaust toxicity
Autorzy:: Janicka, A. B.
Walkowiak, W.
Sobianowska-Turek, A.
Powiązania:: https://bibliotekanauki.pl/articles/243998.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: inner catalyst
exhaust toxicity
internal combustion engine
exhausts toxicity
Opis:: One of the ways for toxic emissions reduction from internal combustion engines, beside external Exhaust purification systems and alternative fuels, is direct intervention into engine combustion process. The inner catalyst application, in form of ceramic active coating applied inside of combustion chamber, is one of the examples of that kind of solution. The application of active coating inside of a compression-ignition engine (diesel engine) may have an important impact on several stages of combustion process: fuel cracking, fore-flame phase, combustion phase and secondary combustion phase. Investigations of such construction are very rare in the literature. The paper presents the results of the researches which aim was analysis of inner catalyst application impact on toxic emissions. As a catalyst platinum and rhodium was used. As a catalyst support and local thermal barrier a zirconium ceramic coating was used. The catalyst was located on the gasoline engine valves surface. The research was done in Emission Research Laboratory of the Division of Motor Vehicles and Internal Combustion Engines. The analysis was done according to European standard (EN ISO 16017-1: 2006) on gas chromatograph (Yarian 450 GC) equipped in capillary column and flame-ionization detector (FID). The results of the researches proofed effectiveness of that solution on toxic emissions limitation.
Źródło:: Journal of KONES; 2010, 17, 3; 149-154
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 19.

Tytuł:: Exhaust gas toxicity problems in ship drives
Autorzy:: Kolanek, C.
Sroka, Z. J.
Walkowiak, W. W.
Powiązania:: https://bibliotekanauki.pl/articles/963451.pdf
Data publikacji:: 2007
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: inland navigation
diesel engine
fuel cell
emission
standards
Opis:: The issues discussed in the article include exhaust gas emission, purity requirements and standards, methods of reducing the emission of harmful exhaust gas components, and alternative and future traction drive sources having the form of fuel cells. The discussion often refers to the situation of road transport, a subsystem which severely affects the environment and thus is obliged to intensify the search for solutions.
Źródło:: Polish Maritime Research; 2007, S 1; 46-52
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 20.

Tytuł:: Sytuacja radiacyjna wód powierzchniowych na Górnym Śląsku - ocena wpływu górnictwa węgla kamiennego
Radiation situation of surface water in Upper Silesia - assessment of coal mining impact
Autorzy:: Kula, A.
Sobianowska, K.
Walkowiak, W.
Maciejewski, P.
Powiązania:: https://bibliotekanauki.pl/articles/348022.pdf
Data publikacji:: 2011
Wydawca:: Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:: wody kopalniane
wody rzeczne
rad-226
rad-228
monitoring środowiska
monitoring radiacyjny
mine water
river water
radium-226
radium-228
environmental monitoring system
radiation monitoring system
Opis:: W publikacji przedstawiono zagadnienie radioaktywności wód kopalnianych charakteryzujących się podwyższoną promieniotwórczością naturalną oraz ich wpływ na wody rzeczne. Przedstawiono wyniki badań wybranych górnośląskich rzek, odbierających wody zrzutowe z kopalni węgla kamiennego. W pierwszej części artykułu przedstawiono źródła promieniotwórcze występujące w środowisku naturalnym oraz omówiono zasady działania systemu monitoringu środowiska w Polsce, z uwzględnieniem monitoringu radiacyjnego. Autorzy przedstawiają nieścisłości w unormowaniach prawnych oraz wady systemu monitorowania terenów przykopalnianych, zagrożonych skażeniami promieniotwórczymi od naturalnych radioizotopów. Zaprezentowane wyniki badań wód kopalnianych potwierdzają, że wody odpadowe nie powodują obecnie znaczących skażeń promieniotwórczych środowiska naturalnego, ponieważ zakłady górnicze, z których odprowadzane są wody o podwyższonej radioaktywności, posiadają odpowiednie systemy oczyszczania.
The main goal of this publication is to describe the problem of radioactivity of coal mine water from Upper Silesia and its influence on the environment surrounding the mines. The first part of this article presents the current knowledge concerning natural and artificial radioactivity and describes the current radiation monitoring system in Poland. The next part presents the results of the analysis of river water taken from different points: below and above the points of discharge of mine water. This analysis was performed in the Chemical Metallurgy Division at Wroclaw University of Technology. The conclusion drawn from the results is as follows: even high concentrations of radium in mine water does not pollute rivers too much.
Źródło:: Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2011, 2; 404-415
1731-8157
Pojawia się w:: Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 21.

Tytuł:: Potential non-toxic aqueous emulsion as a diesel fuel
Autorzy:: Haller, P.
Jankowski, A.
Kolanek, C.
Walkowiak, W.
Powiązania:: https://bibliotekanauki.pl/articles/244342.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: emulsions
water
diesel engine
nitrogen oxides
emissions
Opis:: Natural processes occurring on Earth (fires, volcanic eruptions) and human activity in the area of acquisition and processing of energy, is the cause of the continuous contaminating the atmosphere of combustion products. The combustion of fuels is and will be in the near future primary means of generating energy, including for transportation purposes. Transport is the cause of many environmental threats - emits dust and particles along with many of gaseous harmful substances and also noise and vibration. Power sources used for transport are almost exclusively equipped with internal combustion engines, among which is dominated by a diesel engines. In view of the known advantages of these motors such as high efficiency and relatively low emissions of toxic compounds in the exhaust gas, they have been accepted as the most preferred source of power motor vehicles in the coming decades, assuming that meet the requirements of future regulations regarding environmental protection. The problem to be solved in internal combustion engines is the emission of nitrogen oxides. In this paper are contained an overview of proven methods and results in the reduction of nitrogen oxides in exhaust gases by means of emulsion fuels, and forming an opinion concerning of the usefulness of such solutions in the future.
Źródło:: Journal of KONES; 2015, 22, 3; 43-48
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 22.

Tytuł:: Numeric modelling of fumes flow in exhaust manifold of the combustion engine
Autorzy:: Andrych, M.
Sitnik, L.J.
Tkaczyk, M.
Walkowiak, W.
Powiązania:: https://bibliotekanauki.pl/articles/949509.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
exhaust manifold
fumes flow
numeric modelling
Opis:: In the paper there is presented the methodology of researches as well as the numeric researches results, which aim is the analysis of fumes flow parameters in the exhaust manifold in the diesel engine, particularly the velocity, the temperatures and the turbulence of gas. It has been presented that the research methodology depending on three dimensional model of air flow in the outlet systems with the application of standard numeric methods based on the principles of conservation of: mass, energy and momentum can be the way of researches. The model may be to be the basis for performing changes in geometry of outlet system concerning minimizing the flow losses and shaping the field of velocity. The model enables of calculations of outlet system of internal combustion engines on the stage of its construction. Results show that the numerical simulations methods are one of the possible to use for achievements of investigations low costs, especially that the hardware engine parts must be not prepared. Inter alia, complete model of exhaust manifold, model of fluid volume fitting in the manifold with the numbers of ducting, the grid with applied edge conditions, linear outline of static pressure on the walls of exhaust manifold, total pressure, tension, distribution of total temperature, distribution of fluid velocity on the walls, turbulence intensity are presented in the paper.
Źródło:: Journal of KONES; 2014, 21, 4; 9-14
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 23.

Tytuł:: Research of water - fuel microemulsions as fuel for diesel engine
Autorzy:: Haller, P.
Jankowski, A.
Kolanek, Cz.
Walkowiak, W. W.
Powiązania:: https://bibliotekanauki.pl/articles/246514.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: road transport
combustion engines
emulsion's fuels
air pollution
environmental protection
Opis:: The combustion of fuels is and will be in the nearest future a basic way of acquiring the energy, among others, for transport purposes. Transport causes many threats for natural environment. It produces powders and particulates, together with many gaseous noxious substances and is also the source of noise and vibrations. Sources of propulsion, applied in transport, are almost exclusively piston-combustion engines, among which the dominant role play self-ignition engines. In the light of well-known advantages of these engines, they were accepted as most beneficial sources of car vehicles' propulsion in nearest decades, provided they meet the requirements of the future legal regulations regarding the environmental protection. The emission of nitrogen oxides (NOx) and particulate matters (PM) is a problem to be solved in modern engines. This constitutes so called targets conflict, consisting in excluding the alternative of both coefficients’ decrease, in the way of regulation the set of an engine and the limiting emissions, permitted by the EURO regulations. From among many different methods of limiting both the formation and emission of NOx, the method of the selective catalytic reduction (SCR) is universally applied. This method requires special installation with the catalyst and the reservoir intended for the "clinically" clean reductive measure. In the aspect of constituting opinions regarding the need of reducing additional installations and media on board the vehicle, it seems that to supply the engine with fuel-water emulsion and especially fuel-water microemulsion becomes an interesting solution.
Źródło:: Journal of KONES; 2012, 19, 3; 165-170
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 24.

Tytuł:: Toxicity of polycyclic aromatic hydrocarbons (PAHs) in diesel exhausts
Autorzy:: Janicka, A.
Walkowiak, W.
Tkaczyk, M.
Czarny, A.
Zaczyńska, E.
Powiązania:: https://bibliotekanauki.pl/articles/245718.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: polycyclic aromatic hydrocarbons
exhaust toxicity
Opis:: The paper presents results of analysis of Polycyclic Aromatic Hydrocarbons (PAHs) concentration and toxicity emitted from 1,9 TDI self-ignition. Because of unstable parameters of self-ignition engine work (pressure and temperature jumps), PAHs were extracted from two phases: gas phase and solid phase (particle matter - PM). A chromatographic method (Capillary gas Chromatography) of polycyclic aromatic hydrocarbons identification and analysis, because of their low level of concentration in exhaust gases, needed to be supported by sample purification and enrichment stages. Calibration of the chromatograph was made by attested mixture of 16 model samples (according to EPA, USA). Two different methods for toxicity estimation was used in this researches. The authors used relative carcinogenic coefficients (RCC) which was determined by Nisbet and LaGoy for individual polycyclic aromatic hydrocarbons in relation to benzo(a)pirene. Samples consist PAHs was also tested for cytotoxicity in standardized cell-culture system (human cell line A549, mouse fibroblasts line cell L929). Cell growth, cell morphology and cell viability were used as parameters to determine the cytotoxicity of the materials. The measure the lethality effect on cells was determined spectrophotometrically with the use of a mitochondrial enzyme activity assay for mitochondrial succinate dehydrogenase activity by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT assay). Cells were exposed to the biomaterials for 24, 72 and 120 h. The results of in vitro tests are discussible. A lach of correlation between toxicity measurement methods which was used in these researches was observed.
Źródło:: Journal of KONES; 2009, 16, 4; 195-199
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 25.

Tytuł:: Solving the problem of air quality in Indian cities by retrofitting the EGR
Autorzy:: Sroka, Z. J.
Walkowiak, W.
Reksa, M.
Kolanek, C.
Pillai, C. V.
Powiązania:: https://bibliotekanauki.pl/articles/132981.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: engine pollution
retrofitting
Exhaust Gas Recirculation
EGR
zanieczyszczenia silnika
modernizacja
recyrkulacja spalin
Opis:: This paper touches problem of transportation pollution focusing on NO_x reducing in the India. There were India country chosen for study as the second populated country and most polluted cities in the world. As from statistics, it is known that more than 65% of Indian cars are old and they are the main reason of air pollution. Most of the old cars do not have any control measures for eliminating deadliest gases. Dumping the old cars is not possible, as the poor owns most of the old cars. For eliminating the pollution from old cars, the possible remedy is to control the emission of pollutants. Comparing to all gases in exhaust, nitrogen oxides are the dangerous one. It can may cause up to death. The best method to control the NO_x gas is EGR (Exhaust Gas Recirculation) valves. This research mainly focuses on the possible ways of installing EGR in old engines and fabricate an EGR in one of the Indian cars. Maruti Suzuki 800 is best of for fabricating EGR, as it is a base model and most sold Indian car. As the result, there tremendous decreasing in NO_x emission also the emission CO₂ was reduced. The investigation about fabricating EGR in old vehicle results a positive output after calculated the cost of the fabrication, time consumption, work challenges and other facts. As Indian government adopt this concept, they can reduce the pollution from all types of vehicles to a great extend in few years of time with low investment.
Źródło:: Combustion Engines; 2018, 57, 2; 61-66
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "Walkowiak, W." wg kryterium: Autor

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język