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Wyświetlanie 1-15 z 193
Tytuł:
Prognostic Crown Diameter equations for a Mixed Species Plantation in Southern Nigeria
Autorzy:
Buochuama, A.
Oyebade, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/1113007.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
crown
crown diameter
mixed species plantation
model
Opis:
The dimension of a tree crown has an apparent effect on and is strongly linked with the growth of the tree and its diverse parts. Crown information is an important part of numerous growth and yield models. Hence, empirical predictive equations for crown diameter of a mixed species plantation in Southern Nigeria were developed and evaluated in this study. In studying this phenomenon, total enumeration of the selected species in the mixed species plantation was carried out. Moreover, major growth attributes of 185 trees of six species, namely; Khaya ivorensis, Entandrophragma angolense, Terminalia ivorensis, Tectona grandis, Treculia africana and Mansonia altissima were measured and estimated using mensurational methods. Descriptive, correlation, regression and residual analyses were then applied to the quantitative data obtained from the mixed species plantation. For all the species, the best adjudged model with the best fit indices was Ln(cd) = Ln(b0) + b1·CPA·dbh, R2 = 0.936, SEE = 0.037; an indication of parsimonious potential of a predictive exponential model. This paper, therefore, revealed the possibilities of predicting crown diameter for a mixed species plantation in Nigeria with ample prospects for sustainable planning and management decisions that are relevant for any mixed species plantation.
Źródło:
World News of Natural Sciences; 2018, 16; 117-129
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cykliczne tia- i oksatiaetery o prostej budowie chemicznej
Cyclic thia-and oxathiaethers with simple chemical structure
Autorzy:
Kuś, Piotr
Hellwig, Hubert
Powiązania:
https://bibliotekanauki.pl/articles/1409942.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
tiaetery koronowe
oksatiaetery koronowe
thia-crown-ethers
oxathia-crown-ethers
Opis:
Cyclic thiaethers and oxathiaethers, more often found in the chemical literature as sulfur or sulfur-oxygen analogs of crown ethers (and appearing most often under such names), are an interesting group of organic compounds with large complexing potential, and hence - their application possibilities. However, they are not common research object. This may be due to the fact that many of these compounds are obtained with rather low yields, and moreover, compounds with harmful and dangerous effects on living organisms are sometimes used in their synthesis. Methylene-sulfur cyclic derivatives were very often obtained as random products on the occasion of the preparation of other compounds. Similarly, their complexes have not been presented in large numbers in the chemical literature. The next two groups of compounds: ethylene-sulfur and ethylene-oxysulfur cyclic derivatives are much more frequent and more numerous in the literature. This may be due to the fact that these compounds are similar in structure to the very well-known oxygen crown ethers. All the compounds discussed here have potential possibility and form complexes with a wide variety of metal ions - from alkali to lanthanoid ions. They also form bimetallic complexes, as well as the so-called coordination polymers. The type of complex formed and the central ion with which the complex is formed depends on the type of ligand used for its synthesis. The article presents the current state of knowledge about these dependencies. Attempts to use complexes of these compounds in microelectronics, phototherapy or photodiagnostics, photography and solid phase separation of ions were also presented.
Źródło:
Wiadomości Chemiczne; 2021, 75, 5-6; 653-674
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ksztaltowanie z wiekiem dlugosci korony olszy czarnej [Alnus glutinosa [L.]Gaertn.]
Autorzy:
Dmyterko, E.
Powiązania:
https://bibliotekanauki.pl/articles/973050.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wiek drzew
olsza czarna
Alnus glutinosa
drzewa lesne
względna długość korony
leśnictwo
długość korony
długość absolutna
absolute crown length
relative crown length
primary crown
secondary crown
Opis:
The paper provides research results concerning the relationship between age, absolute height and relative crown length of black alder. Analysis of the ratio of relative crown length to tree height of black alder trees allowed to develop a crown length model. Alder is capable of producing a secondary crown, which entails the shortening of the non−branched section of the trunk. A relationship has been found between the length of the primary crown and the length of the secondary crown depending on elongation of the secondary crown at the cost of shortening of the primary crown.
Źródło:
Sylwan; 2003, 147, 11; 47-53
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crowdsourcing – what it is, works and why it involves so many people?
Autorzy:
Świeszczak, Marika
Świeszczak, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1189007.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
crowdsourcing
crown
task
definitione
Web
Opis:
Crowdsourcing is a recent concept, very popular in companies’ practice and literature. In literature there are many definitions of this concept, but some of them are inconsistent and incomplete. In this paper, existing definitions of crowdsourcing are analyzed to extract common elements and to establish the basic characteristics of any crowdsourcing initiative. Based on these existing definitions, an exhaustive and consistent definition for crowdsourcing is presented and contrasted in thirty two cases.
Źródło:
World Scientific News; 2016, 48; 32-40
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimum Coverings of Crowns with Cycles and Stars
Autorzy:
Lin, Jenq-Jong
Jou, Min-Jen
Powiązania:
https://bibliotekanauki.pl/articles/32361751.pdf
Data publikacji:
2022-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
cycle
star
covering
decomposition
crown
Opis:
Let F, G and H be graphs. A (G, H)-decomposition of F is a partition of the edge set of F into copies of G and copies of H with at least one copy of G and at least one copy of H. For R ⊆ F, a (G, H)-covering of F with padding R is a (G, H)-decomposition of F + E(R). A (G, H)-covering of F with the smallest cardinality is a minimum (G, H)-covering. This paper gives the solution of finding the minimum (Ck, Sk)-covering of the crown Cn,n−1.
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 1; 81-88
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zdobienie ksiąg metryki koronnej za czasów kanclerstwa Jerzego Ossolińskiego
Ornamentation of Crown Metrica books during the chancellorship of Jerzy Ossoliński
Autorzy:
Górny, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/1076650.pdf
Data publikacji:
2019
Wydawca:
Archiwum Główne Akt Dawnych
Tematy:
Metryka Koronna
Jerzy Ossoliński
kancelaria koronna
propaganda polityczna
Crown Metrica
crown chancery
political propaganda
Opis:
Since mid-17th century a new practice can be observed, concerning ornamentation of title pages of the books of inscription of the Crown. Two such ornamented sheets remain from the time when Jerzy Ossoliński held the office of the chancellor. The extant sheets complement the Chancellor’s political agenda, presented in his thanksgiving speeches, delivered upon receiving the seal. This is an example of using the crown chancery to promote political ideas. Additionally, this practice is aligned with the belief that the image is inextricably linked with the text; at the same time, it is a manifestation of Ossoliński’s ambition and hubris
Źródło:
Miscellanea Historico-Archivistica; 2019, 26; 27-34
0860-1054
Pojawia się w:
Miscellanea Historico-Archivistica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of benzene moiety fused with macrocyclic ring on the proton affinity of crown ethers studied in MS/MS experiment
Autorzy:
Frański, R.
Gierczyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/346947.pdf
Data publikacji:
2008
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
crown ethers
proton affinity
mass spectrometry
Opis:
In this paper we address the question how the presence of an aromatic moiety affects the proton affinity of crown ethers. In order to compare the proton affinities of crown ethers studied (M), we compared the abundances of protonated crown ethers ([M + H]+ ions) with the abundance of the ion [NH2-B15C5 + H]+ (formally also protonated crown ether). Both [M + H]+ and [NH2-B15C5 + H]+ were formed as a result of decomposition of [NH2-B15C5 + H + M]+. The presence of a benzene moiety fused with a macrocyclic ring strongly decreases the ratio [M + H]+/[NH2-B15C5 + H]+. Thus, the higher ring strain caused by the benzene moiety leads to a substantial lowering of the proton affinity of crown ethers. It is also suggested that for protonated benzocrown ethers the ring strain is partly compensated by the proton-đ interaction. The presence of an NO2 group decreases the electron density on the aromatic ring and, consequently, the proton-đ interaction is suppressed. As expected, the proton affinity of benzo-crown ethers increases with increasing size of their cavity since the ring strain is lower for larger molecules. An unexpectedly high proton affinity of dicyclohexano-18-crown-6 (DC18C6) has been observed.
Źródło:
Ars Separatoria Acta; 2008, 6; 61-68
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Документ і влада на Галицькій Русі пізнього середньовіччя (У зв’язку з монографією Sven Jaros, Integrationen im Grenzraum. Akteure und Felder multikonfessioneller Herrschaftsaushandlung in Kronruthenien (1340–1434), Berlin–Boston 2021 [Europa im Mittelalter, Bd. 41])
Document and Power in Late Medieval Halych Rus’ (Review: Sven Jaros, Integrationen im Grenzraum. Akteure und Felder multikonfessioneller Herrschaftsaushandlung in Kronruthenien (1340–1434), Berlin–Boston 2021 [Europa im Mittelalter, Bd. 41])
Autorzy:
Зазуляк, Юрій
Powiązania:
https://bibliotekanauki.pl/articles/28713770.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Gdański. Wydawnictwo Uniwersytetu Gdańskiego
Tematy:
Rus’
Crown Rus’
nobility
charters
donation policy
Opis:
The article provides an overview of the recent book written by the German historian Sven Jaros which examines the history of the political process, local elites, and the documentary culture in Halych Rus’ (Red Ruthenia) during the period of the 1340s – 1430s. The book offers a new interpretation of the power relations and the formation of the local elites in the region with a focus on the detailed analysis of the charters issued by the rulers from the Piast, Anjou, and Jagiellon dynasties, as well as by their governors for the local noblemen, townsmen, and commoners. In his analysis Jaros discusses the composition of the groups of the recipients of charters according to their ethnic, social, and geographic origin. The analysis continues with an examination of the mobility of the rulers, governors, and recipients. It seeks to trace the connections between the geographies of the issue of a charter, the property granted, and the residence of the recipients. The book contains short excursions on the beginnings of the Latin Church and the state of the Orthodox Churches in Crown Rus’ under the rule of Casimir III, the Great, as well as on the practices of cura animarum in the region. Jaros concludes that the continuity and changes in the forms of local political communication and the political order, as reflected in the rulers’ charters for Crown Rus’, determined the political and institutional space for the formation of the local nobility as a supra-ethnic and supra-confessional community. The second part of the book consists of a register (repertorium) of all known charters and their deperdita issued for the region’s recipients by the rulers and their governors during the given period. The register is accompanied by observations on the main characteristics of the available corpus of diplomas and charters for the history of Galicia, which highlights the institutional means of their preservation, the correlation between the surviving originals and copies, the mentions of lost documents, etc. The review also offers alternative explanations of some problems raised in the book, such as how some local knightly clans were formed, or the nature of military service and property rights in the lands of Halych Rus’ and its relations to the written documents issued to confirm such rights.
Źródło:
Studia z Dziejów Średniowiecza; 2023, 26; 423-438
2544-2562
Pojawia się w:
Studia z Dziejów Średniowiecza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kancelaria koronna w świetle ksiąg wpisów za Władysława IV
Crown chancery in light of books of inscription during Ladislaus IV reign
Autorzy:
Dąbrowski, Janusz S.
Powiązania:
https://bibliotekanauki.pl/articles/1076646.pdf
Data publikacji:
2019
Wydawca:
Archiwum Główne Akt Dawnych
Tematy:
Władysław IV Waza
Korona
kancelaria koronna
Metryka Koronna
księgi wpisów
Ladislaus IV Vasa the king of Poland (1633–1648)
Crown (Polish)
crown chancery
Crown Metrica (Metrica Regni)
inscription books
Opis:
The paper presents preliminary results of research on the crown chancery of Ladislaus IV Vasa based on 12 books of inscription of the Crown Metrica (Metrica Regni), which reflect one particular aspect of the chancery’s work, namely recording the acts issued by the Office of the King. The offices of chancellor and deputy chancellor were held consecutively by six persons, most prominently by J. Zadzik, P. Gembicki, and J. Ossoliński. The chanceries had retained their modus operandi since the reign of Sigismund III. Every new deputy chancellor took staff members over from the departing chancellor. With time, small groups of royal secretaries in the chanceries grew in importance, the volume of recorded documents decreased, and more documents were made in Polish (14%) as compared to the dominant Latin. Anyway, throughout the reign of Ladislaus IV the chancery created a total of 70000 documents, being most active during the Diet’s sessions
Źródło:
Miscellanea Historico-Archivistica; 2019, 26; 9-16
0860-1054
Pojawia się w:
Miscellanea Historico-Archivistica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strażnicy koronny i wojskowy w dobie Jana Sobieskiego (1667–1696). Kilka uwag o osobach odpowiedzialnych za organizowanie przemarszów armii koronnej
Offices of Grand and Field Guardian in Jan Sobieski period (1667–1696). A few remakes about persons who organised the Crown Army marches
Autorzy:
Hundert, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/688677.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
strażnik wielki koronny
strażnik wojskowy koronny
Jan III Sobieski
armia koronna 1667–1696
Grant Crown Guardian
Field Crown Guardian
king Jan III Sobieski
the Crown Army 1667–1696
Opis:
Offices of Grand and Field Guardian (strażnik wielki and strażnik polny) existed in Polish army since 16th century. Since first half of the 17th century they also have their equivalent in Lithuanian army. One of the main role of such officers was to take care of security of the marching army. During Sobieski’s time (as hetman and then king) this office was held by very experienced and well respected officers, who at the same time were politically connected to Sobieski. Politics could also affect and limit the role, as it happened with Grand Crown Guardian Stefan Bidziński after 1683, when he was in open conflict with Grand Crown Hetman Stanisław Jan Jabłonowski.
Urzędy strażnika wielkiego i wojskowego (polnego) w wojsku koronnym istniały od XVI w. Od pierwszej połowy XVII w. miały one także swoje odpowiedniki w armii Wielkiego Księstwa Litewskiego. Jednym z głównych zadań osób sprawujących te stanowiska było ubezpieczanie maszerujących armii. W czasach Sobieskiego urzędy strażników pełniły osoby o dużym doświadczeniu wojskowym i autorytecie w armii, ale także osoby zależne politycznie od osoby hetmana, a później króla Jana Sobieskiego. Od czynnika politycznego zależne było także ograniczenie prerogatyw strażnika wielkiego Stefana Bidzińskiego po 1683 r., albowiem znajdował się on w otwartym konflikcie z ówczesnym hetmanem wielkim koronnym Stanisławem Janem Jabłonowskim.
Źródło:
Acta Universitatis Lodziensis. Folia Historica; 2017, 99; 149-170
0208-6050
2450-6990
Pojawia się w:
Acta Universitatis Lodziensis. Folia Historica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperament and perception of tooth bleaching results
Autorzy:
Mehr, Katarzyna
Maciejewska-Szaniec, Zofia
Stanglewicz, Tomasz
Maciejewska, Barbara
Pilarska, Agnieszka
Lira, Jarosław
Piotrowski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/553046.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
temperament
tooth bleaching
color perception
crown discoloration.
Źródło:
Family Medicine & Primary Care Review; 2016, 3; 294-297
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tree crown ratio model for Hevea brasiliensis (A. juss.) plantation in Rubber Research Institute of Nigeria (RRIN) Edo State, Nigeria
Autorzy:
Oyebade, Bukola A.
Onyeoguzoro, Truth C.
Powiązania:
https://bibliotekanauki.pl/articles/1178506.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Crown models
growth attributes
prediction
sustainable management
Opis:
Crown ratio is a term used to describe the ratio of the crown length to the total tree height. The crown length emphasizes the distance between the crown apex and the crown point while the distance between the tree apex and the ground level defines the total tree height. The tree crown ratio are predicted by the use of empirical models which assist in the provision of accurate estimates for both individual, stand growth as well as yield that are veritable tools for evaluating numerous management and utilization decision. However, no single type of model can provide sufficient information effectively for all levels of decision making, thus the essence of modeling tree crown ratio for Hevea brasiliensis plantation in Rubber Research Institute of Nigeria (RRIN). Tree growth variables are such as diameter at the base (DB), diameter at the breast height (DBH), crown diameter (CD), crown length (CL), total tree height (THT) were measured from a six year old plantation of 402 trees, while tree attributes such as crown projection area (CPA), basal area (BA), tree slenderness coefficient (TSC), crown ratio (CR) were estimated using their empirical formula. The data collected from the plantation was analyzed using descriptive and inferential statistics such as correlation and regression analyses with non-linear models used in fitting the data into CR equations and other growth attributed with individual data fitted to evaluate the robustness of the models using the fit indices. The result of the study reveals that there were significant variations in the growth attributes within the plantation in the study area. The result of the correlation analysis between CR and other growth characteristics revealed significant associations. The best adjudged CR model was the logistics model which is represented as CR=a_0/(1-e^(^(1-a_(1 ) CL+a_2 THT)) ) ; (R2 = 0.96 and SSE = 0.1177). The study has shown that crown ratio models developed has significant relationship with CL and THT and this can be successfully used for predictive studies on crown attributes for Hevea brasiliensis plantations in Nigeria.
Źródło:
World Scientific News; 2017, 70, 2; 97-110
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mutational witches’ broom impact on the growth of the parent branch in several Pinaceae species
Autorzy:
Zhuk, E.
Vasilyeva, G.
Goroshkevich, S.
Powiązania:
https://bibliotekanauki.pl/articles/2077653.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
somatic mutation
annual rings
crown part interaction
Opis:
Mutational witches’ broom is a part of the tree crown with abnormally dense branching and slow shoot growth, which putatively originates from a cell in a bud apical meristem and can be visually differentiated from the normal crown. The witches’ broom forms a large branching system which competes sufficiently with other parts of the tree crown. However, the competitive relationship and the interaction between the mutant and normal crown parts have not yet been studied. We investigated the patterns and dynamics of the competitive relationship between witches’ broom and normal branching systems of the same tree of five Pinaceae species by tree ring analysis. Three saw-cuts were made in each tree: on the lateral branch with the witches’ broom, on the proximal part of the axial branch in front of the branch with the witches’ broom, on the distal part of the axial branch right after the branch with the witches’ broom. An- nual radial growth was measured to the nearest 0.01 mm, and annual ring areas from three saw-cuts were analysed to compare the growth dynamics before and after witches’ broom appearance. The growth of the lateral branch with the witches’ broom sharply increased in the year of witches’ broom appearance by 2–10 times. The growth of the distal part of the axial branch sharply decreased in the same year, which could be explained only by the witches’ broom appearance. All branches with witches’ brooms gradually became thicker than the distal part of the branch, 3–150 times at the peak of growth, and occasionally outgrew even the proximal part of the branch. Thus, witches’ broom is drastically morphologically and physiologically different from the rest of the crown. All witches’ brooms had their own vertically oriented axis of symmetry and represented autonomous branching systems that were not subordinate to any other branching systems. They break the normal donor-acceptor relationship in a tree and eagerly consume resources without being fully involved in their production. The mutation clearly affects the hormonal regulation of growth and morphogenesis and turns a witches’ broom into a new metabolic sink.
Źródło:
Dendrobiology; 2020, 83; 52-59
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odbiorcy dokumentów wpisanych do Metryki Koronnej w latach 1638–1641
Recipients of documents entered into Crown Metrica in the period 1638–1641
Autorzy:
Wajs, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1065380.pdf
Data publikacji:
2016
Wydawca:
Archiwum Główne Akt Dawnych
Tematy:
Metryka Koronna
księgi wpisów
nadania królewskie
królewszczyzny
dokumenty
Crown Metrica
books of inscription
royal endowments
crown lands
documents
Opis:
Volumes 183 and 186 of the Crown Metrica, preserved in the Central Archives of Historical Records, contain entries of documents issued under chancellory control of Piotr Gembicki. Volume No. 183 contains entries of 142 documents issued in 1638, and volume No. 186 contains 496 entries of documents issued between 28 January 1639 and 11 December 1641. Documents listed in these volumes, however, do not constitute a complete list of all documents issued by the royal chancery in that period. As much as 2/3 of entries in both books pertain to endowments and permits for sale of crown lands. Further 16% of entries are appointments to offices and other functions (e.g. royal appointments for tradesmen), as well as including selected persons in the group of royal courtiers. 13% of entries pertain to various royal endowments, e.g. for towns belonging to magnates or Church dignitaries. The remaining small number of entries are oblata and confirmations of transactions (e.g. purchase/sale of goods between burghers and Church institutions), confirmations of previous royal privileges granted to towns, guilds of artisans, monasteries, professors of Kraków University, etc. In terms of numbers, most recipients of royal documents registered in Crown Metrica volumes 183 and 186 are nobles and magnates. Another important group of recipients of royal documents were also royal and private towns and guilds of artisans, as well as Church institutions and members of the clergy. There are only a few isolated cases of documents issued to peasants
Źródło:
Miscellanea Historico-Archivistica; 2019, 26; 17-25
0860-1054
Pojawia się w:
Miscellanea Historico-Archivistica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proton - ionizable lariat ethers in ion flotation process - effect of alkali metal cations
Autorzy:
Ulewicz, M.
Maciejewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/346941.pdf
Data publikacji:
2008
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
ion flotation
crown ethers
cesium(I)
barium(II)
Opis:
An experimental investigation is presented on flotation of Cs+, Sr2+ and Ba2+ cation metals from dilute aqueous solutions using lariat ethers with a novel protonionizable group in the presence of foaming agent. The influence of concentration of Li+, Na+, K+ (as source of foreign cations) on kinetic rate constant and maximal percent removal was studied. The addition of Li+, Na+, K+ cations (over 1.0ź10-3 mol/dm3) depressed the removal of Cs+, Sr2+ and Ba2+ remarkably, and the removal of floated cations was very low (at the concentration of alkali metal cations – 1.0ź10-2 mol/dm3). The influence of foreign cations on flotation depression increases in the order: K+ < Li+ < Na+. Authors propose the correlation between the maximal percent removal of Cs+, Sr2+ or Ba2+ and concentration of Li+, Na+ or K+ cations in aqueous solution.
Źródło:
Ars Separatoria Acta; 2008, 6; 53-60
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 193

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