996 resultados para 631.1
Resumo:
出稼ぎ農民が多く集まる中国の大都市で、1990年代半ばごろから「民工子弟学校」と呼ばれる小学校が出現している。農民の都市での出稼ぎが長期化する中、家族を呼び寄せて長期的に都市に滞在する出稼ぎ労働者が増えてきたことによる。既存の教育制度の下では戸籍地を離れた学齢児童・生徒は実質的に義務教育を受ける機会を保障されない。「民工子弟学校」はそうした子供たちに教育を受けさせるための、児童の保護者や地方の教員による自発的な取り組みであり、その後地方政府のちに中央政府によって制度化され始めている。論文では筆者のフィールドワークを元に学校の創設から制度化の過程を、中国の二元社会構造を揺るがす変化として考察する。
Resumo:
The notion of common prior is well-understood and widely-used in the incomplete information games literature. For ordinary type spaces the common prior is defined. Pinter and Udvari (2011) introduce the notion of generalized type space. Generalized type spaces are models for various bonded rationality issues, for nite belief hierarchies, unawareness among others. In this paper we dene the notion of common prior for generalized types spaces. Our results are as follows: the generalization (1) suggests a new form of common prior for ordinary type spaces, (2) shows some quantum game theoretic results (Brandenburger and La Mura, 2011) in new light.
Resumo:
Abstract- A Bayesian optimization algorithm for the nurse scheduling problem is presented, which involves choosing a suitable scheduling rule from a set for each nurse's assignment. Unlike our previous work that used GAs to implement implicit learning, the learning in the proposed algorithm is explicit, i.e. eventually, we will be able to identify and mix building blocks directly. The Bayesian optimization algorithm is applied to implement such explicit learning by building a Bayesian network of the joint distribution of solutions. The conditional probability of each variable in the network is computed according to an initial set of promising solutions. Subsequently, each new instance for each variable is generated by using the corresponding conditional probabilities, until all variables have been generated, i.e. in our case, a new rule string has been obtained. Another set of rule strings will be generated in this way, some of which will replace previous strings based on fitness selection. If stopping conditions are not met, the conditional probabilities for all nodes in the Bayesian network are updated again using the current set of promising rule strings. Computational results from 52 real data instances demonstrate the success of this approach. It is also suggested that the learning mechanism in the proposed approach might be suitable for other scheduling problems.
Resumo:
"Über Philosophie der Gesellschaft im 17. und 18. Jahrhundert", Vorlesung oder Seminar in Chicago (?), Datierung unklar, eigenhändige Notizen, 1 Heft, 95 Blätter, davon 76 leer; "Bemerkungen über Wissenschaft und Gesellschaft" (GS 3, S. 40-47), veröffentlicht unter dem Titel "Bemerkungen über Wissenschaft und Krise", in: Zeitschrift für Sozialforschung I, 1932, S. 1-7, Typoskript mit eigenhändiger Korrektur, 11 Blatt; Exzerpte zum Thema "Materialismus und Metaphysik", veröffentlicht in: Zeitschrift für Sozialforschung II, 1933, S.1-33.; Diskussionsbeiträge auf dem XI. Internationalen Soziologenkongress in Genf, Oktober 1933, 1. "Zum Problem der Voraussage in den Sozialwissenschaften" (GS 3, S. 150-157), veröffentlicht in: Zeitschrift für Sozialforschung II, 1933, S. 407-412, a) französische Fassung, Typoskript mit eigenhändiger Korrektur, 8 Blatt, b) französische Fassung, Typoskript mit eigenhändiger Korrektur, 9 Blatt; 2. "Über Funktion und Grenzen der Statistik in den Sozialwissenschaften", französische Fassung, Typoskript mit eigenhändiger Korrektur, 5 Blatt; Exzerpt zu: G.L. Duprat, Typoskript, 1 Blatt; "Auszug aus den dem Kongreß von verschiedenen Teilnehmern vorgelegten Thesen", Typoskript, 3 Blatt; Kongreß-Programme, Drucksachen, 3 Blatt;
Resumo:
The crystal structures of the proton-transfer compounds of 3,5-dinitrosalicylic acid (DNSA) with a series of aniline-type Lewis bases [aniline, 2-hydroxyaniline, 2-methoxyaniline, 3-methoxyaniline, 4-fluoroaniline, 4-chloroaniline and 2-aminoaniline] have been determined and their hydrogen-bonding systems analysed. All are anhydrous 1:1 salts: [(C6H8N)+(C7H3N2O7)-], (1), [(C6H8NO)+(C7H3N2O7)-], (2), [(C7H10NO)+(C7H3N2O7)-], (3), [(C7H10NO)+(C7H3N2O7)-], (4), [(C6H7FN)+(C7H3N2O7)-], (5), [(C6H7ClN)+(C7H3N2O7)-], (6), and [(C6H9N2)+(C7H3N2O7)-], (7) respectively. Crystals of 1 and 6 are triclinic, space group P-1 while the remainder are monoclinic with space group either P21/n (2, 4, 5 and 7) or P21 (3). Unit cell dimensions and contents are: for 1, a = 7.2027(17), b = 7.5699(17), c = 12.9615(16) Å, α = 84.464(14), β = 86.387(15), γ = 75.580(14)o, Z = 2; for 2, a = 7.407(3), b = 6.987(3), c = 27.653(11) Å, β = 94.906(7)o, Z = 4; for 3, a = 8.2816(18), b = 23.151(6), c = 3.9338(10), β = 95.255(19)o, Z = 2; for 4, a = 11.209(2), b = 8.7858(19), c = 15.171(3) Å, β = 93.717(4)o, Z = 4; for 5, a = 26.377(3), b = 10.1602(12), c = 5.1384(10) Å, β = 91.996(13)o, Z = 4; for 6, a = 11.217(3), b = 14.156(5), c = 4.860(3) Å, α = 99.10(4), β = 96.99(4), γ = 76.35(2)o, Z = 2; for 7, a = 12.830(4), b = 8.145(3), c = 14.302(4) Å, β = 102.631(6)o, Z = 4. In all compounds at least one primary linear intermolecular N+-H…O(carboxyl) hydrogen-bonding interaction is present which, together with secondary hydrogen bonding results in the formation of mostly two-dimensional network structures, exceptions being with compounds 4 and 5 (one-dimensional) and compound 6 (three-dimensional). In only two cases [compounds 1 and 4], are weak cation-anion or cation-cation π-π interactions found while weak aromatic C-H…O interactions are insignificant. The study shows that all compounds fit the previously formulated classification scheme for primary and secondary interactive modes for proton-transfer compounds of 3,5-dinitrosalicylic acid but there are some unusual variants.
Resumo:
A novel solid solution in the system Bi-W-Cu-O has been synthesized and its structural and dielectric properties studied. The solid solution Bi2O3-(1-x)WO3-xCuO exists up to x = 0.7; the solid solutions up to x = 0.65 are orthorhombic but stabilize in tetragonal structure in a narrow range around x = 0.7. The solid solutions are non-centrosymmetric and exhibit ferroelectric behaviour similar to their parent phase Bi2WO6. The Curie point of the solid solution is found to decrease with increase in x.
Resumo:
Two new hydrazone chelating ligands, 2-(2-(5-methylisoxazol-3-yl)hydrazono)-5,5-dimethylcyclohexane-1,3-dione (HL1) and 2-(2-(5-tert-butylisoxazol-3-yl)hydrazono)-5,5-dimethylcyclohexane- 1,3-dione (HL2), and their nickel(II) and copper(II) complexes were synthesized using the procedure of diazotization, coupling and metallization. Their structures were postulated based on elemental analysis, H-1 NMR, ESI-MS, FT-IR spectra and UV-vis electronic absorption spectra. Smooth films of these complexes on K9 glass substrates were prepared using spin-coating and their absorption properties were evaluated. The thermal properties of the metal(II) complexes were investigated by thermogravimetry (TG) and differential thermogravimetry (DTG). Different thermodynamic and kinetic parameters namely activation energy (E
Resumo:
High structural and optical quality 1.3 mu m GaInNAs/GaAs quantum well (QW) samples with 42.5% indium content were successfully grown by molecular beam epitaxy. The growth of well layers was monitored by reflection high-energy electron diffraction (RHEED). Room temperature photoluminescence (PL) peak intensity of the GaIn0.425NAs/GaAs (6 nm / 20 nm) 3QW is higher than, and the full width at half maximum (FWHM) is comparable to, that of In0.425GaAs/GaAs 3QW, indicating improved optical quality due to strain compensation effects by introducing N to the high indium content InGaAs epilayer. The measured (004) X-ray rocking curve shows clear satellite peaks and Pendellosung fringes, suggesting high film uniformity and smooth interfaces. The cross sectional TEM measurements further reveal that there are no structural defects in such high indium content QWs. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.