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Wyświetlanie 1-15 z 1108
Tytuł:
The removal of dolomite from collophane using reverse flotation process enhanced by compound collector
Autorzy:
Liu, Liu
Tian, Mengjie
Deng, Xiangyi
Luo, Huihua
Chi, Ruan
Wu, Kang
Powiązania:
https://bibliotekanauki.pl/articles/2200338.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
collophane
dolomite removal
reverse flotation
compound collector
SDS
Opis:
To improve the magnesia removal effect of collophane and increase the P2O5 grade of phosphorus concentrate, the fatty acid collector mixed with sodium dodecyl sulfate (SDS) was used as the compound collector in reverse flotation for magnesia removal in acid system. Solution surface tension measurement, Zeta potential test and infrared spectrum analysis were conducted to analyze the intensified effect of compound collector for dolomite removal. The results showed that under the conditions of grinding fineness -0.074 mm accounted for 89.8%, sulfuric acid dosage 12.0 kg/t, phosphoric acid dosage 3.0 kg/t, SDS compound proportion 3%, collector dosage 1.0 kg/t, the P2O5 grade of concentrate is increased from 25.7% to 29.94%. SDS can reduce the surface tension of slurry, which is conducive to the formation and stability of flotation foam. Zeta potential became negative due to the compound collector adsorbed on the mineral surface. Moreover, the -CH2 antisymmetric stretching vibration peak originated from fatty acid and SDS were detected after the interaction of collectors with dolomite. The compound collector was effectively adsorbed on the surface of dolomite, enhancing the magnesium removal effect of collophane.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 159965
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deliberations about three-phase PLL technologies applied to a grid control of the renewable power system
Autorzy:
Liu, L.
Liu, C.
Powiązania:
https://bibliotekanauki.pl/articles/200960.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
E-PLL
siatka połączona
PLL
SSRF-PL
DDSRF-PLL
grid connected
phase locked loop PLL
Opis:
An efficient phase locked loop (PLL) method is very important to improve the grid-connected efficiency and the locked speed of frequency, phase, and voltage. However, most of literatures only introduce one PLL or one modified PLL method. There are many grid faults due to the grid connection to the renewable power generating system. A comparison and analysis is very important to select the most effective PLL technology for the grid-connected control of the renewable power system. Three PLL technologies are compared at different grid faults, such as single phase voltage drop, two phase voltage drop, frequency deviation, and voltage distortion. Simulation results indicated that different PLL methods have different locked performances at different grid faults.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 261-267
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Commonly used earthquake source models
Autorzy:
Liu, Wenlong
Liu, Yucheng
Powiązania:
https://bibliotekanauki.pl/articles/94697.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
kinematic source model
focal mechanism solution
tectonic stress field
elastodynamic
dislocation theory
seismic rupture
naprężenia tektoniczne
model kinematyczny
mechanizm ognisk
elektrodynamika
Opis:
Several important earthquake source models that have been extensively used in seismological research and earthquake prediction are presented and discussed. A new fault source model is used to explain the earthquake focal mechanism solution and tectonic stress field, which play a crucial role in earthquake initiation and preparation. The elastodynamic-dislocation theory is demonstrated which provides the theoretical background of most earthquake source models. Important earthquake source models reviewed here include the double-force-couple point-source model, the circular-shear dislocation model, the finite moving-source model, the Brune model, and the spherical explosive source model.
Źródło:
Geologos; 2012, 18, 3; 197-209
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The inertia of unicyclic graphs and bicyclic graphs
Autorzy:
Liu, Ying
Powiązania:
https://bibliotekanauki.pl/articles/728942.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
matching number
inertia
nullity
unicyclic graph
bicyclic graph
Opis:
Let G be a graph with n vertices and ν(G) be the matching number of G. The inertia of a graph G, In(G) = (n₊,n₋,n₀) is an integer triple specifying the numbers of positive, negative and zero eigenvalues of the adjacency matrix A(G), respectively. Let η(G) = n₀ denote the nullity of G (the multiplicity of the eigenvalue zero of G). It is well known that if G is a tree, then η(G) = n - 2ν(G). Guo et al. [Ji-Ming Guo, Weigen Yan and Yeong-Nan Yeh. On the nullity and the matching number of unicyclic graphs, Linear Algebra and its Applications, 431 (2009), 1293-1301.] proved if G is a unicyclic graph, then η(G) equals n - 2ν(G) - 1, n-2ν(G) or n - 2ν(G) + 2. Barrett et al. determined the inertia sets for trees and graphs with cut vertices. In this paper, we give the nullity of bicyclic graphs ₙ⁺⁺. Furthermore, we determine the inertia set in unicyclic graphs and ₙ⁺⁺, respectively.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2013, 33, 1; 109-115
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Social Cognitive Domain Coordination in Left-Behind Children: A Comparative Study of Left-Behind and Non-Left-Behind Children in Rural China
Autorzy:
Liu, Jianjin
Powiązania:
https://bibliotekanauki.pl/articles/781143.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
left-behind children
non-left-behind children
moral domain
conventional domain
personal domain
Opis:
Forty-seven left-behind children (LB) and 40 non-left-behind children (NL) in rural China were interviewed to evaluate moral, conventional, and personal violations by providing judgments and justifications. The results suggested that both LBs and NLs differentiate the rules of moral, conventional and personal domains. However, there are some differences: 1. The NL considered it acceptable to commit a personal infraction when there was no rue prohibiting it, while the LB considered it wrong; 2. The younger male LBs were more willing to accept situations without moral psychological rules, compared with younger female LBs, older male LBs, and younger male NLs. Age, sex differences were also found. The one out of our expectation is that younger males considered it more acceptable to commit a personal infraction than older males did and believed it all right if there was no explicit rule on it. Meanwhile, in providing reasons to support their judgments or evaluations, the findings revealed that: 1. More often LBs referred to social conventional reasoning even when evaluating moral and personal rules and violations, especially on personal issues; 2. LBs used more justifications of punishment and fewer justifications of personal growth. The implications of the results of the study for children’s moral development and education, especially for LBs, are discussed.
Źródło:
Ethics in Progress; 2016, 7, 1; 246-283
2084-9257
Pojawia się w:
Ethics in Progress
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive sliding mode control for ship autopilot with speed keeping
Autorzy:
Liu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/259349.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
surface vessel
speed loss
adaptive control
course keeping
sliding mode control
Opis:
The paper addresses an important issue in surface vessel motion control practice that the ship dynamics and sailing performance can be affected by speed loss. The vessel speed is significantly decreased by the added resistance generated by waves. An adaptive sliding mode course keeping control design is proposed which takes into account uncertain ship dynamics caused by forward speed variations, while avoiding performance compromises under changing operating and environmental conditions. The sliding mode control provides robust performance for time-varying wave disturbances and time-varying changes in ship parameters and actuator dynamics. After combining the unknown but bounded system uncertainties, the design of the adaptation law is obtained which is based on the Lyapunov’s direct method. Simulations on a ship with two rudders illustrate the effectiveness of the proposed solution.
Źródło:
Polish Maritime Research; 2018, 4; 21-29
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interlanguage and its Implications in L2 Teaching
Autorzy:
Qingxue, Liu
Powiązania:
https://bibliotekanauki.pl/articles/1036134.pdf
Data publikacji:
2002-06-10
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Opis:
Recent research has shown that adult students learning a second or foreign language generally form a systematic interlanguage grammar which is influenced by both the mother tongue and the target language and has features of each. This interlanguage continues to approximate and improve in the process of the learner’s second language acquisition towards the final internalization of the target language system. In this paper, the author introduces the Interlanuage Hypothesis, analyses its nature and mainly based on the cases of the Chinese adult learners of English, explores the specific characteristics of the interlanguage grammar - its phonology, morphology, syntax and semantics. Towards the end of the paper the author also points out some implications the Interlanguage research might have on the practical fields of our contemporary second language teaching and learning.
Źródło:
Investigationes Linguisticae; 2002, 8; 6-13
1426-188X
1733-1757
Pojawia się w:
Investigationes Linguisticae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding Different Cultural Patterns or Orientations Between East and West
Autorzy:
Qingxue, Liu
Powiązania:
https://bibliotekanauki.pl/articles/1036180.pdf
Data publikacji:
2003-06-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Opis:
Rudyard Kipling says in the Ballad of East and West: “East is East, and West is West; and never the twain shall meet.” Yet, he never expected that with the technological development in transportation and communication, the Westerners and Easterners that have quite different cultures respectively would meet so frequently nowadays in international settings. However, in a sense, Kipling is absolutely correct in that people with different cultural patterns (including beliefs, values, attitudes, norms, customs, and material aspects), especially those from East and West, do encounter communication difficulties, breakdowns, misunderstandings and even conflicts and confrontations just because they fail to understand each other in their intercultural communication. The study of intercultural communication is not something new. However, the perspective from which the author probes into the problematic interaction between Easterners and Westerners is something different. In the paper, the author compares some major cultural patterns: high-context communication vs. low-context communication, individualism vs. collectivism, equality vs. hierarchy, and assertiveness vs. interpersonal harmony. Each of these cultural patterns is defined by examples, two opposite patterns are contrasted, and then potential problems are presented, thus making quite obvious the differences between East and West and their possible consequences in the intercultural communication. Understanding these cultural patterns or orientations which underlie most common behavior of the Easterners and Westerners helps us to see beneath the surface to find out why people from East and West act as they do. This discovery may lead us to appreciate the rich diversity and genius that exist in different parts of the globe, avoid potential intercultural problems and become successful communicators in the interaction between East and West.
Źródło:
Investigationes Linguisticae; 2003, 9; 22-30
1426-188X
1733-1757
Pojawia się w:
Investigationes Linguisticae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Totally real minimal submanifolds in a quaternion projective space
Autorzy:
Liu, Ximin
Powiązania:
https://bibliotekanauki.pl/articles/1294373.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
totally real submanifold
quaternion projective space
curvature pinching
Opis:
We prove some pinching theorems with respect to the scalar curvature of 4-dimensional conformally flat (concircularly flat, quasi-conformally flat) totally real minimal submanifolds in QP⁴(c).
Źródło:
Annales Polonici Mathematici; 1998, 69, 1; 31-36
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Almost split sequences for non-regular modules
Autorzy:
Liu, S.
Powiązania:
https://bibliotekanauki.pl/articles/1208594.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
Let A be an Artin algebra and let $0 → X → ⊕_{i = 1}^rY_i → Z → 0$ be an almost split sequence of A-modules with the $Y_i$ indecomposable. Suppose that X has a projective predecessor and Z has an injective successor in the Auslander-Reiten quiver $Γ_A$ of A. Then r ≤ 4, and r = 4 implies that one of the $Y_i$ is projective-injective. Moreover, if $X → ⊕_{j = 1}^tY_j$ is a source map with the $Y_j$ indecomposable and X on an oriented cycle in $Γ_A$, then t ≤ 4 and at most three of the $Y_j$ are not projective. The dual statement for a sink map holds. Finally, if an arrow X → Y in $Γ_A$ with valuation (d,d') is on an oriented cycle, then dd' ≤ 3.
Źródło:
Fundamenta Mathematicae; 1993, 143, 2; 183-190
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure-Interatomic Separation-Temperature Relationship of Alkali Halides
Autorzy:
Liu, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1505082.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.30.-t
65.40.De
Opis:
A new method for the determination of pressure-interatomic separation-temperature relationship is investigated and applied for some alkali halides. The method is developed by using the Mie-Gruneisen equation of state and the Anderson thermal pressure and an ionic model based on Harrison's treatment of overlap repulsive potential which takes into account the interactions up to second neighbors. It is found that the new method yields satisfactory results in agreement with the available experimental data.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 829-834
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure Dependence of Interatomic Separation and Thermal Expansivity for Alkali Halides and Periclase (MgO)
Autorzy:
Liu, Q.
Powiązania:
https://bibliotekanauki.pl/articles/1808121.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.30.-t
65.40.De
91.60.Ki
Opis:
In this paper, a new isothermal equation of state is developed based on an approximation for the volume dependence of the Anderson-Grüneisen parameter $δ_T$ along isotherm. The values of interatomic separation r with the change of pressure for nine alkali halides and periclase were investigated with the help of the new isotherm equation of state. The compression data are used to predict the pressure dependence of the coefficient of volume thermal expansion. The results are compared with the available experimental data and other theoretical results.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 709-712
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Book Review: D. Newby (ed.), Insights into the European Portfolio for Student Teachers of Languages (EPOSTL), Cambridge Scholars Publishing, Cambridge 2012, vi + 231 pp.
Autorzy:
Liu, Li
Powiązania:
https://bibliotekanauki.pl/articles/2028708.pdf
Data publikacji:
2014-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Źródło:
The New Educational Review; 2014, 35; 281-284
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1108

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